Biochar as potential sustainable precursors for activated carbon production: Multiple applications in environmental protection and energy storage
作者：
Tan, Xiao-fei;Liu, Shao-bo;Liu, Yun-guo* ;Gu, Yan-ling;Zeng, Guang-ming;...
期刊：
Bioresource Technology ,2017年227:359-372 ISSN：0960-8524
通讯作者：
Liu, Yun-guo
作者机构：
[Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Liu, Shao-heng; Tan, Xiao-fei; Hua, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Gu, Yan-ling; Jiang, Lu-hua; Liu, Yun-guo; Liu, Shao-heng; Tan, Xiao-fei; Hua, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Hua, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Liu, Yun-guo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
*Activated carbon;*Biochar;*CO(2) capture;*Energy storage;*Water pollution treatment
摘要：
There is a growing interest of the scientific community on production of activated carbon using biochar as potential sustainable precursors pyrolyzed from biomass wastes. Physical activation and chemical activation are the main methods applied in the activation process. These methods could have significantly beneficial effects on biochar chemical/physical properties, which make it suitable for multiple applications including water pollution treatment, CO2capture, and energy storage. The feedstock with different compositions, pyrolysis conditions and activation parameters of biochar have significant influences on the properties of resultant activated carbon. Compared with traditional activated carbon, activated biochar appears to be a new potential cost-effective and environmentally-friendly carbon materials with great application prospect in many fields. This review not only summarizes information from the current analysis of activated biochar and their multiple applications for further optimization and understanding, but also offers new directions for development of activated biochar. © 2016 Elsevier Ltd
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英文
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Oryzanol Modifies High Fat Diet-Induced Obesity, Liver Gene Expression Profile, and Inflammation Response in Mice
作者：
Wang, Long;Lin, Qiniu* ;Yang, Tao;Liang, Ying;Nie, Ying;...
期刊：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ,2017年65(38):8374-8385 ISSN：0021-8561
通讯作者：
Lin, Qiniu;Luo, Feijun
作者机构：
[Wang, Long; Lin, QN; Luo, FJ; Tang, Yiping; Luo, Feijun; Yang, Tao; Lin, Qiniu; Fu, Xiangjin; Shen, Junjun; Nie, Ying; Liang, Ying] Cent South Univ Forestry & Technol, Natl Engn Lab Deep Proc Rice & Byprod, Key Lab Hunan Prov Special Med Food, Lab Mol Nutr,Coll Food Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Luo, Yi] Cent S Univ, Xiangya Sch Med, Dept Clin Med, Changsha 410008, Hunan, Peoples R China.
通讯机构：
[Lin, QN; Luo, FJ] C;Cent South Univ Forestry & Technol, Natl Engn Lab Deep Proc Rice & Byprod, Key Lab Hunan Prov Special Med Food, Lab Mol Nutr,Coll Food Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
NF-kappaB;gene chip;hyperlipidemia;lipid metabolism;oryzanol
摘要：
In Western countries and China, the dietary habit of high calories usually results in hyperlipidemia, which is closely associated with cardiovascular diseases. In the study, we investigated the antihyperlipidemic effect of oryzanol and its molecular mechanism in the high fat diet (HFD) mouse model. In total, 60 ICR mice were randomly divided into control group, HFD group, and HFD+Ory group. The mice from the HFD+Ory group were additionally fed with 100 mg/kg of oryzanol by intragastric administration. Our data indicated that oryzanol treatment for 10 weeks significantly reduced bodyweight, liver weight, and adipose tissues weight of the mice;lowered the contents of total cholesterol (TC), triglycerides (TG), and low density lipoprotein-cholesterol (LDL-C);and elevated high density lipoprotein-cholesterol (HDL-C) in the plasma of HFD mice. Compared with the HFD group, H&E staining showed that oryzanol treatment decreased the size of fat droplets of liver tissues and the size of adipocytes. Gene chip data found that oryzanol administration caused 32 genes to increase expressions while 60 genes had reduced expressions in the liver tissues of HFD mice. IPA software was used to analyze the protein interaction network and found that transcript factor NF-κB located in the central role of network, meaning NF-κB may have important function in the lipid-lowering effect of oryzanol. Western blotting and RT-qPCR confirmed that lipid metabolism-related gene expressions were obviously regulated by oryzanol administration. Oryzanol also inhibited expressions of inflammatory factor in the liver tissues of HDF mice. Taken together, our data indicate that oryzanol treatment can regulate lipid metabolism-related gene expressions and inhibit HDF-caused obesity in mice. ©2017 American Chemical Society.
语种：
英文
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Past and future carbon sequestration benefits of China’s grain for green program
作者：
Deng, Lei;Liu, Shuguang;Kim, Dong Gill;Peng, Changhui;Sweeney, Sandra;...
期刊：
Global Environmental Change ,2017年47:13-20 ISSN：0959-3780
通讯作者：
Shangguan, Zhouping
作者机构：
[Deng, Lei; Peng, Changhui; Shangguan, Zhouping] Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.;[Deng, Lei; Shangguan, Zhouping] Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China.;[Deng, Lei; Shangguan, Zhouping] Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China.;[Liu, Shuguang] Cent South Univ Forestry & Technol, State Engn Lab Southern Forestry Appl Ecol & Tecn, Changsha 410004, Hunan, Peoples R China.;[Kim, Dong Gill] Hawassa Univ, Wondo Genet Coll Forestry & Nat Resources, POB 128, Shashemene, Ethiopia.
通讯机构：
[Shangguan, Zhouping] N;Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
关键词：
Afforestation;Carbon sequestration;Carbon stock;Forest ecosystem;Grain for green program;Land use change
摘要：
Carbon sequestration through ecological restoration programs is an increasingly important option to reduce the rise of atmospheric carbon dioxide concentration. China's Grain for Green Program (GGP) is likely the largest centrally organized land-use change program in human history and yet its carbon sequestration benefit has yet to be systematically assessed. Here we used seven empirical/statistical equations of forest biomass carbon sequestration and five soil carbon change models to estimate the total and decadal carbon sequestration potentials of the GGP during 1999–2050, including changes in four carbon pools: aboveground biomass, roots, forest floor and soil organic carbon. The results showed that the total carbon stock in the GGP-affected areas was 682 Tg C in 2010 and the accumulative carbon sink estimates induced by the GGP would be 1697, 2635, 3438 and 4115 Tg C for 2020, 2030, 2040 and 2050, respectively. Overall, the carbon sequestration capacity of the GGP can offset about 3%–5% of China's annual carbon emissions (calculated using 2010 emissions) and about 1% of the global carbon emissions. Afforestation by the GGP contributed about 25% of biomass carbon sinks in global carbon sequestration in 2000–2010. The results suggest that large-scale ecological restoration programs such as afforestation and reforestation could help to enhance global carbon sinks, which may shed new light on the carbon sequestration benefits of such programs in China and also in other regions. © 2017 Elsevier Ltd
语种：
英文
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Octacosanol Attenuates Inflammation in Both RAW264.7 Macrophages and a Mouse Model of Colitis
作者：
Guo, Tianyi;Lin, Qinlu;Li, Xinhua;Nie, Ying;Wang, Long;...
期刊：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ,2017年65(18):3647-3658 ISSN：0021-8561
通讯作者：
Luo, Feijun
作者机构：
[Wang, Long; Hu, Tao; Luo, Feijun; Guo, Ting; Guo, Tianyi; Shi, Limin; Nie, Ying; Xu, Wei; Lin, Qinlu] Cent South Univ Forestry & Technol, Coll Food Sci & Engn, Natl Engn Lab Rice & Byprod, Lab Mol Nutr, Changsha 410004, Hunan, Peoples R China.;[Li, Xinhua] Cent S Univ, Xiangya Hosp, Dept Gastroenterol, Changsha 410008, Hunan, Peoples R China.;[Luo, Feijun] Cent South Univ Forestry & Technol, Coll Food Sci & Technol, Lab Mol Nutr, 498 Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Luo, Feijun] C;Cent South Univ Forestry & Technol, Coll Food Sci & Technol, Lab Mol Nutr, 498 Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
关键词：
octacosanol;colitis;inflammation factor;MAPK;NF-kappa B;AP-1
摘要：
Octacosanol has multiple biological functions. In this study, the anti-inflammatory effect and molecular mechanism of octacosanol were evaluated by using dextran sulfate sodium (DSS)-induced ulcerative colitis model in mice and lipopolysaccharide (LPS)-stimulated mouse macrophage RAW264.7 cells. The colitis mouse model was induced by 3.0% DSS in 8-week ICR mice and octacosanol orally administered with 100 mg/kg/day. The results showed that octacosanol significantly improved the health status of mice and reduced DSS-induced pathological damage in the colonic tissues. Octacosanol obviously inhibited the mRNA and protein expression levels of pro-inflammatory factors of colonic tissues. In vitro, octacosanol administration significantly reduced the expression of mRNA or protein of pro-inflammatory cytokines and the phosphorylation of c-Jun N-terminal kinase and p38, and it also partly prevented LPS-induced translocations of NF-κB and AP-1. Octacosanol has anti-inflammatory effect, and its molecular mechanism may be involved in downregulating the expression of inflammatory factors and blocking of MAPK/NF-κB/AP-1 signaling pathway. ©2017 American Chemical Society.
语种：
英文
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Electrocoagulation treatment of arsenic in wastewaters: A comprehensive review
作者：
Song, Peipei;Yang, Zhaohui* ;Zeng, Guangming;Yang, Xia;Xu, Haiyin;...
期刊：
Chemical Engineering Journal ,2017年317:707-725 ISSN：1385-8947
通讯作者：
Yang, Zhaohui
作者机构：
[Song, Peipei; Yang, Zhaohui; Ahmad, Kito; Zeng, Guangming; Yang, Xia; Xu, Rui; Wang, Like; Xiong, Weiping] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Song, Peipei; Yang, Zhaohui; Ahmad, Kito; Zeng, Guangming; Yang, Xia; Xu, Rui; Wang, Like; Xiong, Weiping] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Xu, Haiyin] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Yang, Zhaohui] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Adsorption behavior;Arsenic;As(III) oxidation;EC products;Electrocoagulation;Electrocoagulation reactor configuration
摘要：
Arsenic, classified as a carcinogen, is being subject to high concern due to its high toxicity especially in drinking water. Electrocoagulation (EC) has displayed a great potential as an effective and environmentally friendly method to remove arsenic from wastewaters. This review summarizes the recent development of arsenic removal in EC process including the effects of primary operating parameters, optimization of the EC performance, as well as the evaluation of EC reactor configurations. Production and characterization of EC products with respect to different electrodes are systematically discussed. Besides, this review sheds light on the debate about the mechanism involved in As(III) oxidation and further explores the arsenic adsorption behavior in EC process. Moreover, the performance of EC and other technologies are compared, and future research needs for arsenic removal in EC process are suggested accordingly. Overall, this review will contribute to deepening the understanding of EC process for arsenic removal and offer useful information to researchers in this field. © 2017 Elsevier B.V.
语种：
英文
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Allometric equations for integrating remote sensing imagery into forest monitoring programmes
作者：
Jucker, Tommaso* ;Caspersen, John;Chave, Jerome;Antin, Cecile;Barbier, Nicolas;...
期刊：
Global Change Biology ,2017年23(1):177-190 ISSN：1354-1013
通讯作者：
Jucker, Tommaso
作者机构：
[Coomes, David A.; Jucker, Tommaso; Wedeux, Beatrice M. M.] Univ Cambridge, Dept Plant Sci, Forest Ecol & Conservat Grp, Cambridge, England.;[Caspersen, John] Univ Toronto, Fac Forestry, 33 Willcocks St, Toronto, ON M5S 3B3, Canada.;[Caspersen, John; Zimmermann, Niklaus E.; Waldner, Peter; Haeni, Matthias] Swiss Fed Res Inst WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland.;[Chave, Jerome] Univ Toulouse 3, Lab Evolut & Diversite Biol, UMR5174, CNRS, Batiment 4R1,118 Route Narbonne, F-31062 Toulouse, France.;[Antin, Cecile; Barbier, Nicolas; Momo, Stephane; Ploton, Pierre] UMR AMAP, Inst Rech Dev, Montpellier, France.
通讯机构：
[Jucker, Tommaso] U;Univ Cambridge, Dept Plant Sci, Forest Ecol & Conservat Grp, Cambridge, England.
关键词：
aboveground biomass;airborne laser scanning;carbon mapping;crown architecture;height–diameter allometry;stem diameter distributions
摘要：
Remote sensing is revolutionizing the way we study forests, and recent technological advances mean we are now able – for the first time – to identify and measure the crown dimensions of individual trees from airborne imagery. Yet to make full use of these data for quantifying forest carbon stocks and dynamics, a new generation of allometric tools which have tree height and crown size at their centre are needed. Here, we compile a global database of 108753 trees for which stem diameter, height and crown diameter have all been measured, including 2395 trees harvested to measure aboveground biomass. Using this database, we develop general allometric models for estimating both the diameter and aboveground biomass of trees from attributes which can be remotely sensed – specifically height and crown diameter. We show that tree height and crown diameter jointly quantify the aboveground biomass of individual trees and find that a single equation predicts stem diameter from these two variables across the world's forests. These new allometric models provide an intuitive way of integrating remote sensing imagery into large-scale forest monitoring programmes and will be of key importance for parameterizing the next generation of dynamic vegetation models. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
语种：
英文
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Biochar-based nano-composites for the decontamination of wastewater: A review
作者：
Tan, Xiao-fei;Liu, Yun-guo* ;Gu, Yan-ling;Xu, Yan;Zeng, Guang-ming;...
期刊：
Bioresource Technology ,2016年212:318-333 ISSN：0960-8524
通讯作者：
Liu, Yun-guo
作者机构：
[Gu, Yan-ling; Xu, Yan; Liu, Yun-guo; Liu, Si-mian; Li, Jiang; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Gu, Yan-ling; Xu, Yan; Liu, Yun-guo; Liu, Si-mian; Li, Jiang; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Liu, Shao-bo] Cent S Univ, Sch Met & Environm, Changsha 410083, Hunan, Peoples R China.;[Hu, Xin-jiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Liu, Yun-guo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Adsorption;Biochar;Catalytic degradation;Nano-composites;Synthesis;Wastewater
摘要：
Synthesizing biochar-based nano-composites can obtain new composites and combine the advantages of biochar with nano-materials. The resulting composites usually exhibit great improvement in functional groups, pore properties, surface active sites, catalytic degradation ability and easy to separation. These composites have excellent abilities to adsorb a range of contaminants from aqueous solutions. Particularly, catalytic material-coated biochar can exert simultaneous adsorption and catalytic degradation function for organic contaminants removal. Synthesizing biochar-based nano-composites has become an important practice for expanding the environmental applications of biochar and nanotechnology. This paper aims to review and summarize the various synthesis techniques for biochar-based nano-composites and their effects on the decontamination of wastewater. The characteristic and advantages of existing synthesis methods are summarized and discussed. Application of biochar-based nano-composites for different contaminants removal and the underlying mechanisms are reviewed. Furthermore, knowledge gaps that exist in the fabrication and application of biochar-based nano-composites are also identified. © 2016 Elsevier Ltd.
语种：
英文
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Removal of 17β-estradiol by few-layered graphene oxide nanosheets from aqueous solutions: External influence and adsorption mechanism
作者：
Jiang, Lu-hua;Liu, Yun-guo* ;Zeng, Guang-ming;Xiao, Fang-yu;Hu, Xin-jiang;...
期刊：
Chemical Engineering Journal ,2016年284:93-102 ISSN：1385-8947
通讯作者：
Liu, Yun-guo
作者机构：
[Zhou, Lu; Jiang, Lu-hua; Liu, Yun-guo; Xiao, Fang-yu; Wang, Hui; Li, Ting-ting; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Zhou, Lu; Jiang, Lu-hua; Liu, Yun-guo; Xiao, Fang-yu; Wang, Hui; Li, Ting-ting; Tan, Xiao-fei; Hu, Xin-jiang; Zeng, Guang-ming] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China.;[Hu, Xi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Liu, Yun-guo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Endocrine disrupting chemicals;17 beta-estradiol;Graphene oxide nanosheets;Adsorption;pi-pi interaction
摘要：
This study demonstrates the use of few-layered graphene oxide nanosheets (GO) as efficient adsorbents for the removal of 17β-Estradiol (E2) from aqueous solutions via strong adsorptive interactions. The adsorption performance of GO was investigated by batch adsorption experiments. Further, adsorption experiments were carried out in the presence of other environmental pollutants to understand external influence on the adsorption of E2 by GO. The result indicated that the maximum adsorption capacity (qm) of GO for E2 obtained from the Langmuir isotherm was 149.4mg/g at 298K and it was the highest values of E2 adsorption compared to that of other adsorbents reported before. Thermodynamic study indicated that the adsorption was a spontaneous process. In addition, the result showed that E2 adsorption on GO was slight affected by the solution pH. The presence of NaCl in the solution facilitated the E2 adsorption and the optimum adsorption capacity was obtained when the NaCl concentration was 0.001M. Moreover, the effect of background electrolyte divalent cations (Mg2+ and Ca2+) was not similar with the monovalent cations (Na+ and K+). While the influence of background electrolyte anions (Cl-, NO3-, SO42-, and PO43-) were not significantly different. The presence of humic acid reduced E2 adsorption on GO at pH 7.0. GO still exhibited excellent adsorption capacity following numerous desorption/adsorption cycles. Besides, both π-π interactions and hydrogen bonds might be responsible for the adsorption of E2 onto GO. © 2015 Elsevier B.V.
语种：
英文
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Performance enhancement of recycled concrete aggregate - A review
作者：
Shi, Caijun* ;Li, Yake;Zhang, Jiake;Li, Wengui;Chong, Linlin;...
期刊：
Journal of Cleaner Production ,2016年112:466-472 ISSN：0959-6526
通讯作者：
Shi, Caijun
作者机构：
[Shi, Caijun; Xie, Zhaobin; Chong, Linlin; Zhang, Jiake; Li, Wengui] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.;[Li, Yake] WOWA Int Engn & Consulting Co Ltd, Guangzhou 518067, Guangdong, Peoples R China.;[Xie, Zhaobin] Cent South Univ Forestry & Technol, Coll Civil Engn & Mech, Changsha, Hunan, Peoples R China.
通讯机构：
[Shi, Caijun] H;Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Adhered cement mortar;Enhancement treatment;Recycled concrete aggregate;Strength
摘要：
Recycled concrete aggregate differ from natural aggregate as the former contains hardened cement mortar. The adhered cement mortar on recycled concrete aggregate has higher porosity and water absorption and lower strength than natural aggregate do. It has negative effects on the mechanical properties and durability of fresh and hardened concrete made with recycled concrete aggregate. Therefore, it will facilitate the applications of recycled concrete aggregate if the adhered cement mortar can be enhanced. Removing and strengthening the adhered mortar are the two main methods for enhancing the properties of recycled concrete aggregate. This paper reviews the published enhancement methods for recycled concrete aggregate, and points out their advantages and disadvantages so as to facilitate the selection and further development of suitable enhancement methods for recycled concrete aggregate. It suggests that carbonation treatment is an efficient and feasible method for improving the mechanical properties and durability of recycled concrete aggregate. Carbonation treatment of recycled concrete aggregate is not only an efficient way for enhancing the properties of recycled concrete aggregate, but also an environmental friendly approach. ©2015 Elsevier Ltd. All rights reserved.
语种：
英文
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Investigation of the adsorption-reduction mechanisms of hexavalent chromium by ramie biochars of different pyrolytic temperatures
作者：
Zhou, Lu;Liu, Yunguo* ;Liu, Shaobo;Yin, Yicheng;Zeng, Guangming;...
期刊：
Bioresource Technology ,2016年218:351-359 ISSN：0960-8524
通讯作者：
Liu, Yunguo
作者机构：
[Zhou, Lu; Liu, Yunguo; Zeng, Guangming; Jiang, Luhua; Tan, Xiaofei; Hu, Xinjiang; Yin, Yicheng; Liu, Shaoheng; Ding, Yang; Huang, Xixian] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Zhou, Lu; Liu, Yunguo; Zeng, Guangming; Jiang, Luhua; Tan, Xiaofei; Hu, Xinjiang; Yin, Yicheng; Liu, Shaoheng; Ding, Yang; Huang, Xixian] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Liu, Shaobo] Cent S Univ, Coll Architecture & Art, Changsha 410082, Hunan, Peoples R China.;[Hu, Xi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn Res, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Liu, Yunguo] H;Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Biochar;Chromium;Mechanisms;Pyrolysis temperature;Ramie residues
摘要：
To investigate the relationship between Cr(VI) adsorption mechanisms and physio-chemical properties of biochar, ramie residues were oxygen-limited pyrolyzed under temperature varying from 300 to 600 °C. Batch adsorption experiments indicated that higher pyrolysis temperature limits Cr(VI) sorption in terms of capacity and affinity due to a higher aromatic structure and fewer polar functional groups in biochar. Both electrostatic (physical) and ionic (chemical) interactions were involved in the Cr(VI) removal. For low-temperature biochar, the simple physical adsorption was limited and the significant improvement in Cr(VI) sorption was attributed to abundant carboxyl and hydroxyl groups. The adsorption-reduction mechanisms could be concluded that Cr(VI) ions were electrostatically attracted by the positively charged biochar surface and reduced to Cr(III), and then the converted Cr(III) was retained or discharged into the solution. The study demonstrates ramie residues can be converted into biochar as a low-cost and effective sorbent for Cr(VI) removal. © 2016 Elsevier Ltd.
语种：
英文
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Cellulose Nanoparticles: Structure-Morphology-Rheology Relationships
作者：
Li, Mei-Chun;Wu, Qinglin* ;Song, Kunlin;Lee, Sunyoung;Qing, Yan;...
期刊：
ACS SUSTAINABLE CHEMISTRY & ENGINEERING ,2015年3(5):821-832 ISSN：2168-0485
通讯作者：
Wu, Qinglin
作者机构：
[Song, Kunlin; Li, Mei-Chun; Wu, Qinglin] Louisiana State Univ, AgCenter, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.;[Lee, Sunyoung] Korea Forest Res Inst, Dept Forest Prod, Seoul 130712, South Korea.;[Wu, Yiqiang; Qing, Yan] Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Qinglin] L;Louisiana State Univ, AgCenter, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.
关键词：
Cellulose nanofibers;Cellulose nanocrystals;Structure;Rheological properties;Aspect ratio
摘要：
The present study aims to investigate the structure-morphology-rheology relationships for cellulose nanoparticles (CNPs), including cellulose nanofibers (CNFs) and cellulose nanocrystals (CNCs). CNCs were extracted from never dried CNFs using sulfuric acid with controlled hydrolysis time. The crystalline structure, surface charge, morphology, and rheological behavior of the CNPs were measured and contrasted. The CNF suspensions exhibited rigid solid-like viscoelastic behavior even at a low concentration due to the formation of a highly entangled network. Upon acid hydrolysis, the network of rigid, long, and highly entangled nanofibers was eliminated, resulting in a significant loss of viscoelastic properties. Both steady-state and dynamic rheological measurements showed that the rheological behavior of the CNC suspensions was strongly dependent on the concentration and acid hydrolysis time. The CNC suspensions exhibited elastic gel-like rheological behavior at high concentrations but viscous liquid-like rheological behavior at low concentrations. Longer acid hydrolysis time produced CNCs with a lower aspect ratio, leading to higher critical transition concentration for the formation of anisotropic phase. The aspect ratio of CNCs was predicted from the intrinsic viscosity using the Simha's equation. The theoretically predicted aspect ratio values corresponded well with the transmission electron microscopy results. Finally, the network of CNF and CNC suspensions were schematically proposed. (Graph Presented). © 2015 American Chemical Society.
语种：
英文
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Global comparison of light use efficiency models for simulating terrestrial vegetation gross primary production based on the LaThuile database
作者：
Yuan, Wenping* ;Cai, Wenwen;Xia, Jiangzhou;Chen, Jiquan;Liu, Shuguang;...
期刊：
Agricultural and Forest Meteorology ,2014年192:108-120 ISSN：0168-1923
通讯作者：
Yuan, Wenping
作者机构：
[Yuan, Wenping; Chen, Yang; Xia, Jiangzhou; Cai, Wenwen; Liu, Dan; Dong, Wenjie] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China.;[Yuan, Wenping] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China.;[Chen, Jiquan] Nanjing Univ Informat Sci & Technol, Int Ctr Ecol Meteorol & Environm, Nanjing 210044, Jiangsu, Peoples R China.;[Chen, Jiquan] Univ Toledo, Dept Environm Sci, Toledo, OH 43606 USA.;[Liu, Shuguang] Cent South Univ Forestry & Technol, State Engn Lab Southern Forestry Appl Ecol & Tech, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Yuan, Wenping] B;Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China.
关键词：
Gross primary production;Light use efficiency;Seven LUE models
摘要：
Simulating gross primary productivity (GPP) of terrestrial ecosystems has been a major challenge in quantifying the global carbon cycle. Many different light use efficiency (LUE) models have been developed recently, but our understanding of the relative merits of different models remains limited. Using CO2 flux measurements from multiple eddy covariance sites, we here compared and assessed major algorithms and performance of seven LUE models (CASA, CFix, CFlux, EC-LUE, MODIS, VPM and VPRM). Comparison between simulated GPP and estimated GPP from flux measurements showed that model performance differed substantially among ecosystem types. In general, most models performed better in capturing the temporal changes and magnitude of GPP in deciduous broadleaf forests and mixed forests than in evergreen broadleaf forests and shrublands. Six of the seven LUE models significantly underestimated GPP during cloudy days because the impacts of diffuse radiation on light use efficiency were ignored in the models. CFlux and EC-LUE exhibited the lowest root mean square error among all models at 80% and 75% of the sites, respectively. Moreover, these two models showed better performance than others in simulating interannual variability of GPP. Two pairwise comparisons revealed that the seven models differed substantially in algorithms describing the environmental regulations, particularly water stress, on GPP. This analysis highlights the need to improve representation of the impacts of diffuse radiation and water stress in the LUE models. © 2014 Elsevier B.V.
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英文
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Surface urban heat island in China's 32 major cities: Spatial patterns and drivers
作者：
Zhou, Decheng;Zhao, Shuqing* ;Liu, Shuguang;Zhang, Liangxia;Zhu, Chao
期刊：
Remote Sensing of Environment ,2014年152:51-61 ISSN：0034-4257
通讯作者：
Zhao, Shuqing
作者机构：
[Zhou, Decheng; Zhu, Chao; Zhao, Shuqing] Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China.;[Zhou, Decheng; Zhu, Chao; Zhao, Shuqing] Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China.;[Liu, Shuguang] Natl Engn Lab Forest Ecol & Appl Technol Southern, Changsha 410004, Hunan, Peoples R China.;[Liu, Shuguang] Cent South Univ Forest & Technol, Changsha 410004, Hunan, Peoples R China.;[Zhang, Liangxia] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China.
通讯机构：
[Zhao, Shuqing] P;Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China.
关键词：
Albedo;Climatic effects;Driving forces;Enhanced vegetation index (EVI);Land surface temperature (LST);Spatial variations;Urbanization
摘要：
Urban heat island (UHI) is a major anthropogenic alteration on Earth environments and its geospatial pattern remains poorly understood over large areas. Using MODIS data from 2003 to 2011, we quantified the diurnal and seasonal surface UHI intensity (SUHII, urban-suburban temperature difference) in China's 32 major cities, and analyzed their spatial variations and possible underlying mechanisms. Results show that the annual mean SUHII varied markedly from 0.01 to 1.87. °C in the day and 0.35 to 1.95. °C at night, with a great deal of spatial heterogeneities. Higher SUHIIs for the day and night were observed in the southeastern and northern regions, respectively. Moreover, the SUHII differed greatly by season, characterized by a higher intensity in summer than in winter during the day, and the opposite during the night for most cities. Consequently, whether the daytime SUHII was higher or lower than the nighttime SUHII for a city depends strongly on the geographic location and research period. The SUHII's distribution in the day related closely to vegetation activity and anthropogenic heat releases in summer, and to climate (temperature and precipitation) in winter, while that at night linked tightly to albedo, anthropogenic heat releases, built-up intensity, and climate in both seasons. Overall, we found the overwhelming control of climate on the SUHII's spatial variability, yet the factors included in this study explained a much smaller fraction of the SUHII variations in the day compared to night and in summer relative to winter (day vs. night: 57% vs. 72% in summer, and 61% vs. 90% in winter, respectively), indicating more complicated mechanisms underlying the distribution of daytime SUHII, particularly in summer. Our results highlight the different diurnal (day and night) and seasonal (summer and winter) SUHII's spatial patterns and driving forces, suggesting various strategies are needed for an effective UHI effect mitigation. ©2014 Elsevier Inc.
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英文
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The ERF transcription factor TaERF3 promotes tolerance to salt and drought stresses in wheat
作者：
Rong, Wei;Qi, Lin;Wang, Aiyun;Ye, Xingguo;Du, Lipu;...
期刊：
Plant Biotechnology Journal ,2014年12(4):468-479 ISSN：1467-7644
通讯作者：
Zhang, Zengyan
作者机构：
[Du, Lipu; Ye, Xingguo; Qi, Lin; Zhang, Zengyan; Liang, Hongxia; Xin, Zhiyong; Rong, Wei] Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Key Lab Biol & Genet Improvement Triticeae Crops, Inst Crop Sci,Minist Agr, Beijing 100193, Peoples R China.;[Wang, Aiyun; Rong, Wei] Cent South Univ Forestry & Technol, Changsha, Peoples R China.
通讯机构：
[Zhang, Zengyan] C;Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Key Lab Biol & Genet Improvement Triticeae Crops, Inst Crop Sci,Minist Agr, Beijing 100193, Peoples R China.
关键词：
Triticum aestivum;ERF protein TaERF3;TaERF3 overexpression;salt and drought tolerance;stress-related genes;TaERF3 silencing
摘要：
Salinity and drought are major limiting factors of wheat (Triticum aestivum) productivity worldwide. Here, we report the function of a wheat ERF transcription factor TaERF3 in salt and drought responses and the underlying mechanism of TaERF3 function. Upon treatment with 250mm NaCl or 20% polyethylene glycol (PEG), transcript levels of TaERF3 were rapidly induced in wheat. Using wheat cultivar Yangmai 12 as the transformation recipient, four TaERF3-overexpressing transgenic lines were generated and functionally characterized. The seedlings of the TaERF3-overexpressing transgenic lines exhibited significantly enhanced tolerance to both salt and drought stresses as compared to untransformed wheat. In the leaves of TaERF3-overexpressing lines, accumulation levels of both proline and chlorophyll were significantly increased, whereas H2O2 content and stomatal conductance were significantly reduced. Conversely, TaERF3-silencing wheat plants that were generated through virus-induced gene silencing method displayed more sensitivity to salt and drought stresses compared with the control plants. Real-time quantitative RT-PCR analyses showed that transcript levels of ten stress-related genes were increased in TaERF3-overexpressing lines, but compromised in TaERF3-silencing wheat plants. Electrophoretic mobility shift assays showed that the TaERF3 protein could interact with the GCC-box cis-element present in the promoters of seven TaERF3-activated stress-related genes. These results indicate that TaERF3 positively regulates wheat adaptation responses to salt and drought stresses through the activation of stress-related genes and that TaERF3 is an attractive engineering target in applied efforts to improve abiotic stress tolerances in wheat and other cereals.
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英文
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The impacts of climate change and human activities on biogeochemical cycles on the Qinghai-Tibetan Plateau
作者：
Chen, Huai;Zhu, Qiuan
（ ;Peng, Changhui
* ;Wu, Ning;Wang, Yanfen;...
期刊：
Global Change Biology ,2013年19(10):2940-2955 ISSN：1354-1013
通讯作者：
Peng, Changhui
作者机构：
[Chen, Huai; Wu, Ning; Zhu, Dan; Zhao, Xinquan] Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China.;[Chen, Huai; Zhu, Qiuan; Peng, Changhui; Yang, Gang; Luo, Zhibin; Zhang, Yao] Northwest Agr & Forest Univ, Lab Ecol Forecasting & Global Change, Coll Forestry, Yangling 712100, Peoples R China.;[Chen, Huai; Zhu, Qiuan; Wu, Ning; Wang, Yanfen; Gao, Yongheng; Zhu, Dan; Yang, Gang; Tian, Jianqing] Chinese Acad Sci, Zoige Peatland & Global Change Res Stn, Hongyuan 624400, Peoples R China.;[Peng, Changhui; Fang, Xiuqing] Univ Quebec, Inst Environm Sci, Dept Biol Sci, Montreal, PQ C3H 3P8, Canada.;[Wu, Ning] Int Ctr Integrated Mt Dev, Kathmandu, Nepal.
通讯机构：
[Peng, Changhui] N;Northwest Agr & Forest Univ, Lab Ecol Forecasting & Global Change, Coll Forestry, Yangling 712100, Peoples R China.
关键词：
carbon budget;ice retreat;intact ecosystems;land use change;permafrost
摘要：
With a pace of about twice the observed rate of global warming, the temperature on the Qinghai-Tibetan Plateau (Earth's 'third pole') has increased by 0.2°C per decade over the past 50years, which results in significant permafrost thawing and glacier retreat. Our review suggested that warming enhanced net primary production and soil respiration, decreased methane (CH4) emissions from wetlands and increased CH4 consumption of meadows, but might increase CH4 emissions from lakes. Warming-induced permafrost thawing and glaciers melting would also result in substantial emission of old carbon dioxide (CO2) and CH4. Nitrous oxide (N2O) emission was not stimulated by warming itself, but might be slightly enhanced by wetting. However, there are many uncertainties in such biogeochemical cycles under climate change. Human activities (e.g. grazing, land cover changes) further modified the biogeochemical cycles and amplified such uncertainties on the plateau. If the projected warming and wetting continues, the future biogeochemical cycles will be more complicated. So facing research in this field is an ongoing challenge of integrating field observations with process-based ecosystem models to predict the impacts of future climate change and human activities at various temporal and spatial scales. To reduce the uncertainties and to improve the precision of the predictions of the impacts of climate change and human activities on biogeochemical cycles, efforts should focus on conducting more field observation studies, integrating data within improved models, and developing new knowledge about coupling among carbon, nitrogen, and phosphorus biogeochemical cycles as well as about the role of microbes in these cycles. © 2013 John Wiley & Sons Ltd.
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英文
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Self-assembling behavior of cellulose nanoparticles during freeze-drying: Effect of suspension concentration, particle size, crystal structure, and surface charge
作者：
Han, Jingquan;Zhou, Chengjun;Wu, Yiqiang;Liu, Fangyang;Wu, Qinglin*
期刊：
Biomacromolecules ,2013年14(5):1529-1540 ISSN：1525-7797
通讯作者：
Wu, Qinglin
作者机构：
[Han, Jingquan; Wu, Qinglin; Zhou, Chengjun] Louisiana State Univ AgCtr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.;[Wu, Yiqiang] Cent South Forestry Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.;[Liu, Fangyang] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.
通讯机构：
[Wu, Qinglin] L;Louisiana State Univ AgCtr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA.
摘要：
Cellulose nanocrystals and cellulose nanofibers with I and II crystalline allomorphs (designated as CNC I, CNC II, CNF I, and CNF II) were isolated from bleached wood fibers by alkaline pretreatment and acid hydrolysis. The effects of concentration, particle size, surface charge, and crystal structure on the lyophilization-induced self-assembly of cellulose particles in aqueous suspensions were studied. Within the concentration range of 0.5 to 1.0 wt %, cellulose particles self-organized into lamellar structured foam composed of aligned membrane layers with widths between 0.5 and 3 μm. At 0.05 wt %, CNC I, CNF I, CNC II, and CNF II self-assembled into oriented ultrafine fibers with mean diameters of 0.57, 1.02, 1.50, and 1.00 μm, respectively. The size of self-assembled fibers became larger when more hydroxyl groups and fewer sulfates (weaker electrostatic repulsion) were on cellulose surfaces. Possible formation mechanism was inferred from ice growth and interaction between cellulose nanoparticles in liquid-crystalline suspensions. © 2013 American Chemical Society.
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英文
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A review of the biogas industry in China
作者：
Jiang, Xinyuan* ;Sommer, Sven G.;Christensen, Knud V.
期刊：
Energy Policy ,2011年39(10):6073-6081 ISSN：0301-4215
通讯作者：
Jiang, Xinyuan
作者机构：
[Jiang, Xinyuan] Cent S Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Christensen, Knud V.; Sommer, Sven G.] Univ So Denmark, Inst Chem Engn Biotechnol & Environm Technol, Fac Engn, DK-5230 Odense M, Denmark.
通讯机构：
[Jiang, Xinyuan] C;Cent S Univ Forestry & Technol, Sch Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
China;Sustainable development;Biogas
摘要：
This article presents an overview of the development and future perspectives of the Chinese biogas industry. The development of the industry has the potential to improve the rural environment and produce significant amounts of sustainable energy for China. Barriers to the development are the relatively weak environmental policies, imperfect financial policies and lack of long-term follow-up services. The rapid economic development of China has also seen a development in the scales of biogas plants constructed. Although the technology has been improved, this review has identified problems in the construction and operation of Chinese biogas plants, particularly in the efficiency of household systems. All levels of China's government acknowledge this and recent biogas projects have more focus on quality and less on the quantity. The intention is to gradually introduce stricter environmental policies, to provide better service systems, improve the financial policies that support the construction and follow-up service of biogas projects, promote the use of standardized engineering equipment and materials and standards for plant construction and production. This will promote the development of biogas projects at various scales further, and reduce the dependency on fossil fuels and emissions of greenhouse gases. (C) 2011 Elsevier Ltd. All rights reserved.
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英文
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