期刊:
Science of The Total Environment,2024年912:169155 ISSN:0048-9697
通讯作者:
Zhang, Xuan
作者机构:
[Ma, Fengfeng; Fan, Huixin; Huang, Jing; Huang, Zhongliang; Tian, Yuxin; Qin, Xiaoli; Wu, Zijian; Li, Hui] State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, Hunan 410004, PR China;[Feng, Chongling; Zhou, Zhou] College of Environmental Science and Engineering, Central South University of Forestry and Technology, 498 South Shaoshan Road, Changsha, Hunan 410004, PR China;[Zhang, Xuan] State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, Hunan 410004, PR China. Electronic address: zhangxuansherry@163.com
通讯机构:
[Zhang, Xuan] S;State Key Laboratory of Utilization of Woody Oil Resource, Hunan Academy of Forestry, Changsha, Hunan 410004, PR China. Electronic address:
摘要:
Characterized by irregular spatial and temporal variations of pollutant loading and complex occurrence mechanisms, agricultural nonpoint source pollution (ANPSP) has always been a great challenge in field restoration worldwide. Returning farmlands to wetlands (RFWs) as an ecological restoration mode among various constructed wetlands was selected to manage ANPSP in this study. Triarrhena lutarioriparia, Nelumbo nucifera and Zizania latifolia monocultures were designed and the water pollutants was monitored. N. nucifera and Z. latifolia could reach the highest TN (53.28%) and TP (53.22%) removal efficiency, respectively. By 16s high-throughput sequencing of rhizosphere bacteria, 45 functional species were the main contributors for efficient N and P removal, and 38 functional keystone taxa (FKT) were found with significant ecological niche roles and metabolic functions. To our knowledge, this is the first study to explore the microbial driving N and P removal mechanism in response to ANPSP treated by field scale RFWs.
期刊:
Science of The Total Environment,2024年906:167219 ISSN:0048-9697
通讯作者:
Wang, Ping;Zhu, Jian
作者机构:
[Zhou, Tao; Sun, Jikang; Xing, Qinqin] College of Life Science and Technology, Central South University of Forestry and Technology, No. 498, South Shaoshan Road, Changsha 410004, Hunan Province, China;[Wang, Ping] College of Environmental Science and Engineering, Central South University of Forestry and Technology, No. 498, South Shaoshan Road, Changsha 410004, Hunan Province, China. Electronic address: pingwang@csuft.edu.cn;[Zhu, Jian] College of Environmental Science and Engineering, Central South University of Forestry and Technology, No. 498, South Shaoshan Road, Changsha 410004, Hunan Province, China. Electronic address: znlzhujian@csuft.edu.cn;[Liu, Zhiming] Department of Biology, Eastern New Mexico University, Portales, NM 88130, United States of America
通讯机构:
[Zhu, Jian; Wang, Ping] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, No. 498, South Shaoshan Road, Changsha 410004, Hunan Province, China. Electronic address:
关键词:
Cd stress;Koelreuteria paniculata;KpMIPS;Resistance
摘要:
Cadmium (Cd) pollution in soil is an important factor endangering plant growth and harming human health through food chains. Koelreuteria paniculata is an important woody plant for ecological restoration of Cd-contaminated soils. In this study, KpMIPS gene of K. paniculata was cloned, and the expressed protein (60kDa) had 1-phosphate synthase activity. The results showed that KpMIPS significantly promoted root development of K. paniculata and Arabidopsis thaliana, reduced damage to the roots of Arabidopsis thaliana caused by Cd, and decreased transfer of Cd to the aboveground parts of K. paniculata and Arabidopsis thaliana . In the K. paniculata plants overexpressing KpMIPS integrity of the root cells was maintained and the content of pectin and phytic acid was significantly increased. Overexpression of KpMIPS increased the Cd accumulation in the roots and decreased the Cd content in the stems and leaves. Clearly, KpMIPS could regulate the contents of pectin and phytic acid in K. paniculata, thereby passivating Cd(2+) and enriching it in the root cell wall, reducing the transfer of free Cd(2+) to other parts of K. paniculata, and providing a positive regulatory effect on the Cd resistance of K. paniculata. The results of the study provide a technical introduction for the selection and genetic improvement of target genes regulating heavy metal resistance of plants in phytoremediation technology.
期刊:
International Journal of Biological Macromolecules,2024年254(Pt 3):128068 ISSN:0141-8130
通讯作者:
Xu, Tao
作者机构:
[Li, Qing; Wang, Wenlei; Hu, Xingyu; Lu, Danqing] College of Science, Central South University of Forestry and Technology, Changsha 410004, China;[You, Yong] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Wen, Qian] College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Yu, Gang] College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;[Xu, Tao] College of Science, Central South University of Forestry and Technology, Changsha 410004, China. Electronic address: tao_xu@csuft.edu.cn
通讯机构:
[Xu, Tao] C;College of Science, Central South University of Forestry and Technology, Changsha 410004, China. Electronic address:
摘要:
This work innovatively used cellulose nanofibers as a photocatalyst carrier, which could recycle nano-photocatalysts and minimize nanoparticle aggregation. The morphology, structures, chemical composition, optical-electronic properties and photocatalytic performance of amino-modified carbon quantum dots-ZnO/cellulose nanofiber (N-CQDs-ZnO/CNF: ZCH-2) hydrogel were characterized by SEM, TEM, BET, EDS, XRD, FTIR, UV-vis, XPS, PL and other techniques. The mechanism of Cr(VI) adsorption synergistic photoreduction by ZCH-2 was discussed in detail. The results showed that the prepared ZCH-2 had excellent removal performance for Cr(VI). After 120min of adsorption and 40min of photoreduction, the removal efficiency of Cr(VI) was 98.9%. Compared with ZnO/CNF hydrogel, the adsorption performance of ZCH-2 increased by 268% and the photoreduction performance increased by 116%. The adsorption of Cr(VI) by ZCH-2 was controlled by electrostatic attraction and chemical adsorption. The photoreduction kinetic constant of ZCH-2 was 0.106min(-1), which was 8.9 times that of ZnO/CNF hydrogel. The N-CQDs in ZCH-2 could form N-CQDs-metal complexes with Cr(VI), resulting in fluorescence quenching, so Cr(VI) could be visually identified by fluorescence changes. This study provides a new idea for the design and optimization of a new multifunctional hydrogel with efficient adsorption-photoreduction-fluorescence recognition.
期刊:
Science of The Total Environment,2024年908:168319 ISSN:0048-9697
通讯作者:
Wan, Da-Juan;Gu, Jiao-Feng
作者机构:
[Yuan, Teng-Yue] School of Geographical Sciences, Hunan Normal University, Changsha, Hunan 410081, China;[Wan, Da-Juan] School of Geographical Sciences, Hunan Normal University, Changsha, Hunan 410081, China. Electronic address: dajuanwan@163.com;[Yang, Wen-Jun; Liao, Bo-Han; Zeng, Peng; Zhou, Hang; Gu, Jiao-Feng] College of Environment Science and Engineering, Hunan Engineering Laboratory for Control of Rice Quality and Safety, Central South University of Forestry and Technology, Changsha 410004, China;[Yang, Wen-Jun; Liao, Bo-Han; Zeng, Peng; Zhou, Hang] Hunan Provincial Key Laboratory of Wetland and Soil Ecological Remediation, Changsha 410004, China;[Gu, Jiao-Feng] Hunan Provincial Key Laboratory of Wetland and Soil Ecological Remediation, Changsha 410004, China. Electronic address: gujiaofeng@csuft.edu.cn
通讯机构:
[Gu, Jiao-Feng] H;[Wan, Da-Juan] S;School of Geographical Sciences, Hunan Normal University, Changsha, Hunan 410081, China. Electronic address:;Hunan Provincial Key Laboratory of Wetland and Soil Ecological Remediation, Changsha 410004, China. Electronic address:
关键词:
Auxiliary measures;Heavy metal contamination;Phytoremediation;Rotation mode
摘要:
Phytoremediation is the direct use of living green plants and it is an effective, inexpensive, non-invasive, and environmentally friendly technique used to transfer or stabilize all the toxic metals and environmental pollutants in polluted soil or ground water. To study the effect of tartaric acid, gibberellin, and tartaric acid coupled with gibberellin on rape-kenaf or rape-sweet sorghum rotation, a field experiment was carried out on a farmland combined polluted with Cd and Pb in eastern Hunan Province, China. The results showed that these two rotation systems coupled with superposition measure has potential to enhance yield and biomass of rape (Brassica napus L.), kenaf (Hibiscus cannabinus) and sweet sorghum (Sorghum dochna (F.) Snowden), as well as to increase Cd and Pb uptake of the three crops, thus accelerating phytoextraction. The Cd and Pb annual removal by rape-kenaf rotation in one year under different treatments were 269-438 and 112-149g·hm(-2), respectively. And the Cd and Pb annual removal by rape-sweet sorghum rotation in one year under different treatments were 68.0-111 and 43.8-92.3g·hm(-2), respectively. Under the two rotation systems, these integrated management measures can remove Cd and Pb up to 438g·hm(-2)·year(-1) and 149g·hm(-2)·year(-1), respectively. The Cd and Pb content in rape seeds or sweet sorghum stems and leaves were lower than the food or forage standard, indicating that we can use this rotation system for both remediation and safety production. Furthermore, the two rotation systems also generated considerable economic value. These results showed that the combination of phytoremediation and agricultural production is a feasible technical mode in the field of Cd and Pb co-contamination, and also provides useful information for further study of the interaction mechanism between rotation crops and enhancement measures. In subsequent experiments we can set concentration gradients for tartaric acid and gibberellin, and we can also select other crops for rotation, with a view to finding the optimal auxiliary measure and crop rotation modern.
摘要:
Abstract: Ecologically fragile areas in China account for more than half of its land area. Performing early warning assessments and trend analyses of resource and environment carrying capacity in ecologically fragile areas can lay a scientific foundation for ecological conservation in the areas. Based on the connotation of resource and environment carrying capacity, an early warning index system of resource and environment carrying capacity in Altay prefecture was constructed from the three aspects natural resource carrying capacity, eco-environment carrying capacity, and economic and social support capacity. The grey relational projection method model was used to analyze the current alarm situation of the resource and environment carrying capacity in Altay prefecture from 2011 to 2020, and then the back propagation (BP) neural network and a mathematical statistics software were used to predict the evolution of the alarm situation of the resource and environment carrying capacity in Altay prefecture from 2021 to 2025. The results demonstrated that (1) the natural resource carrying capacity subsystem was the main system of the development of the resource and environment carrying capacity in Altay prefecture, and its impact on the resource and environment carrying capacity in Altay prefecture was greater than the eco-environment carrying capacity and economic and social support capacity; (2) the resource and environmental carrying capacity of Altay prefecture showed a slight upward trend from 2011 to 2020, although the range was constrained and the level of warning remained “moderate warning”. A spatial pattern of “weak in the middle, strong in the two poles” was exhibited by the warning scenario about the carrying capacity of each county and city. Except for the warning of Habahe County and Qinghe County, where the warning was slightly worse than that in 2020, the warning of resource and environment carrying capacity in Altay prefecture and other counties and cities would show a trend of fluctuation and decline from 2021 to 2025. However, the degree of alarm did not change substantially and remained at the level of “moderate warning”; (3) the main factors restricting the mitigation of the warning of resource and environment carrying capacity in Altay prefecture included a low soil fertility index, a small total reservoir capacity, low per capita mineral resource reserves, a low water resource development and utilization rate, a low comprehensive utilization rate of industrial solid waste, and a low land output rate. Keywords: resource and environment carrying capacity; ecologically fragile areas; grey relational projection method; BP neural network
摘要:
Abstract: Highlights What are the main finding? Spirulina platensis was applied to treat mariculture wastewater for N and P removal. Microalgal aggregates were formed under air velocity of 1.75 cm/s or higher. What is the implication of the main finding? Microalgal aggregation was promoted, which was attributed to the protein contents in TB-EPS. P accumulation in biomass was enhanced accompanied by the aggregation process. Abstract As an important alternative to alleviate the shortage of wild fishery resources, mariculture is facing increasing challenges on the wastewater treatment, mainly due to the salinity brought from seawater and low nutrient concentration. In this study, Spirulina platensis (S. platensis) was adopted as the target algae stain for synthetic mariculture wastewater treatment, which exhibited excellent adaptability to high-saline wastewater during a 40 days’ adaptive culture. Then, the microalgae stain was inoculated into photo-bioreactors with different uplift airflow velocity (UAV) to achieve microalgal aggregation. After 10 days of pre-cultivation and a 30-day granulation process, the maximum nutrient removal rates by S. platensis were 86.5% of TN (to 3.4 mg/L), 98.1% of TP (to 0.1 mg/L) and 95.8% of DOC (to 5.5 mg/L), with 3.5 g/L of biomass content in synthetic wastewater. Analysis of phosphorus and EPS content showed that higher protein content in tightly bound EPS and enhanced P accumulation was accompanied with the microalgal aggregation processes, and P was mainly distributed in the residual rather than the EPS part of microalgal aggregates, indicating that the development of aggregates from suspension S. platensis would benefit not only biomass separation, but also phosphorus recovery, being a potential treatment for simultaneously removing nutrients and recovering mariculture wastewater. Keywords: microalgal aggregation; mariculture wastewater; Spirulina platensis; nutrients’ removal
通讯机构:
[Hu, XJ; Yang, X ] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
关键词:
Zn/AI/Zr LDH;Hydrothermal carbon;Phosphorus adorption;Water body restoration
摘要:
Phosphorus enrichment and recovery from wastewater, as well as its use as fertilizer in agricultural output, is an efficient method of addressing both phosphorus pollution and phosphorus resource scarcity. In this study, Zn/Al/Zr LDH with hydrothermal carbon loading (ZARH) composites were prepared by co-precipitation method and applied to simulate the efficient enrichment of phosphorus in wastewater. The microstructural characterization showed that ZARH-3 composites had a large specific surface area and multiple adsorption sites. Within 120 minutes, ZARH-3 composites could remove 99% phosphorus (25 mg/L). Furthermore, the saturation adsorption capacity of the composites was 26.64 mg/g when pH was 5. Both the Langmuir and Temkin models accurately described the isothermal adsorption data (R-2 > 0.99). Finally, zeta potential, XPS, and FT-IR were used to explain the adsorption mechanism of phosphorus by ZARH-3 composites. Results show that phosphorus was enriched by interacting with the composites primarily through ion exchange, electrostatic interaction, and ligand exchange. In conclusion, ZARH-3 composites prepared in this study is a highly efficient adsorbent for phosphorus removal from aqueous solutions. This research can provide scientific basis for the efficient remediation of eutrophication water body containing phosphorus and effective recovery of phosphorus resources.
摘要:
Porous carbon is one of the important CO2 adsorbents being developed at present. However, interpreting the potential mechanism of CO2 adsorption by porous carbon is still challenging due to their various functional groups, different structural characteristics and different adsorption conditions (temperature and pressure) during CO2 adsorption. Here, this study firstly applied machine learning to study the effects of pore structure, chemical properties, and adsorption conditions on CO2 adsorption performance based on 1594 CO2 adsorption datasets, and to predict CO2 adsorption capacity. The results show that the R2 of the random forest (RF) model is above 0.97 on the training and test data, which has good prediction performance. According to RF analysis results, the nitrogen groups of porous carbon have the greatest impact on CO2 capture at 0–0.15 bar, while ultra-micropores have the greatest impact on CO2 capture at 0.15–1 bar. Subsequently, we prepared three kinds of porous carbons with different pore structures and functional groups, and carried out CO2 adsorption isotherm tests. The results were consistent with the results of machine learning. However, the above results hardly reveal the effect of functional group type and pore size on CO2 capture. Finally, the relative importance of pore size and functional group on CO2 adsorption under different pressures was calculated by molecular simulation, and the mechanism of CO2 adsorption by a single pore size and functional group species was revealed. The results based on the aforementioned machine learning, experimental data and molecular simulation are of great significance for predicting gas adsorption and guiding the development of the carbon-based adsorbents.
关键词:
Nitrogen and sulfur co-doped;Persulfate;Porous carbons;Thiamethoxam
摘要:
Nitrogen and sulfur co-doped porous biochar (NSBC) was synthesized through the pyrolysis of Phytolacca aci-nose Roxb biomass in the presence of sodium bicarbonate and L-cysteine monohydrochloride. The resulting NSBC exhibited exceptional adsorption and catalytic degradation properties, demonstrating remarkable effi-ciency in the oxidation and degradation of thiamethoxam (THM) solutions. To elucidate the underlying oxidation mechanism, a combination of radical quenching techniques and advanced in situ electron paramagnetic reso-nance (EPR) spectroscopy was employed. The experimental findings revealed that the enhanced oxidation ef-ficiency observed in the NSBC+PS system could be attributed to the synergistic interaction between singlet oxygen (1O2) and Reactive Oxygen Species (ROS). The introduction of nitrogen and sulfur doped facilitated the formation of point defects, which in turn promoted the generation of 1O2. Furthermore, the degradation path-ways of THM intermediates were successfully elucidated. This study presents a novel approach for the synthesis and application of high-quality catalysts in water treatment.
摘要:
Sediment is the internal and external source of water environment pollution, so sediment remediation is the premise of water body purification. Sediment microbial fuel cell (SMFC) can remove the organic pollutants in sediment by electroactive microorganisms, compete with methanogens for electrons, and realize resource recycling, methane emission inhibiting and energy recovering. Due to these characteristics, SMFC have attracted wide attention for sediment remediation. In this paper, we comprehensively summarized the recent advances of SMFC in the following areas: (1) The advantages and disadvantages of current applied sediment remediation technologies; (2) The basic principles and influencing factors of SMFC; (3) The application of SMFC for pollutant removal, phosphorus transformation and remote monitoring and power supply; (4) Enhancement strategies for SMFC in sediments remediation such as SMFC coupled with constructed wetland, aquatic plant and iron-based reaction. Finally, we have summarized the drawback of SMFC and discuss the future development directions of applying SMFC for sediment bioremediation.
关键词:
(1)O(2);Catalysts;Generation pathways;Identification methods;PMS system
摘要:
Catalysts for peroxymonosulfate (PMS) activation are appealing in the purification of organic wastewater. Singlet oxygen ((1)O(2)) is widely recognized as a crucial reactive species for degrading organic contaminants in catalysts/PMS systems due to its adamant resistance to inorganic anions, high selectivity, and broad pH applicability. With the rapid growth of studies on (1)O(2) in catalysts/PMS systems, it becomes necessary to provide a comprehensive review of its current state. This review highlights recent advancements concerning (1)O(2) in catalysts/PMS systems, with a primary focus on generation pathways and identification methods. The generation pathways of (1)O(2) are summarized based on whether (distinguished by the geometric structures of metal species) or not (distinguished by the active sites) the metal element is included in the catalysts. Furthermore, this review thoroughly discusses the influence of metal valence states and metal species with different geometric structures on (1)O(2) generation. Various potential strategies are explored to regulate the generation of (1)O(2) from the perspective of catalyst design. Identification methods of (1)O(2) primarily include electron paramagnetic resonance (EPR), quenching experiments, reaction in D(2)O solution, and chemical probe tests in catalysts/PMS systems. The principles and applications of these methods are presented comprehensively along with their applicability, possible disagreements, and corresponding solutions. Besides, an identifying procedure on the combination of main identification methods is provided to evaluate the role of (1)O(2) in catalysts/PMS systems. Lastly, several perspectives for further studies are proposed to facilitate developments of (1)O(2) in catalysts/PMS systems.
摘要:
To address conventional powder catalysts' recovery and aggregation issues that greatly restrain their practical application, a recoverable graphene oxide (GO)-supported 3D-MoS(2)/FeCo(2)O(4) sponge (SFCMG) was developed through a simple impregnation pyrolysis method. SFCMG can efficiently activate peroxymonosulfate (PMS) to produce reactive species for rapid degradation of rhodamine B (RhB), with 95.0% and 100% of RhB being removed within 2min and 10min, respectively. The presence of GO enhances the electron transfer performance of the sponge, and the three-dimensional melamine sponge serves as a substrate to provide a highly dispersed carrier for FeCo(2)O(4) and MoS(2)/GO hybrid sheets. SFCMG exhibits a synergistic catalytic effect of Fe and Co, and facilitates the redox cycles of Fe(III)/Fe(II) and Co(III)/Co(II) by MoS(2) co-catalysis, which enhances its catalytic activity. Electron paramagnetic resonance results demonstrate that SO(4)(•-), ·O(2)(-) and (1)O(2) are all involved in SFCMG/PMS system, and (1)O(2) played a prominent role in RhB degradation. The system has good resistance to anions (Cl(-), SO(4)(2-), and H(2)PO(4)(-)) and humic acid and excellent performance for many typical contaminants degradation. Additionally, it works efficiently over a wide pH range (3-9) and possesses high stability and reusability with the metal leaching far below the safety standards. The present study extends the practical application of metal co-catalysis and offers a promising Fenton-like catalyst for the treatment of organic wastewater.
期刊:
Journal of Hazardous Materials,2023年441:129974 ISSN:0304-3894
通讯作者:
Haiyin Xu<&wdkj&>Ping Wang
作者机构:
[Xu, Haiyin; Luo, Yuanling] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Peoples R China.;[Zhao, Xiaojing; Xu, Haiyin; Wang, Ping; Yang, Yi] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Luo, Yuanling] Changsha Environm Protect Coll, Changsha 410004, Peoples R China.;[Xie, Huaming; Zhou, Changsheng; Wang, Chuan] Pan China Construction Grp Co Ltd, Changsha 410004, Peoples R China.;[Liu, Zhiming] Eastern New Mex Univ, Dept Biol, Portales, NM 88130 USA.
通讯机构:
[Haiyin Xu; Ping Wang] C;College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
摘要:
Wastewater treatment plant (WWTP) has great potential to regulate microplastics (MPs) emissions, but few studies have focused on this subject. The present study performed a long-term investigation in a typically combined sewers WWTP. Compared to dry weather, rainfall contributed approximately 1.5 times more MPs to the inlet of the combined WWTP. The equalization tank served as a primary site for MPs' removal, with a 46.67-87.91 % removal rate. Decreasing surface overflow rate (SOR) was an effective measure for improving MPs removal, and a suitable SOR was recommended at similar to 11 m(3) (d.m(2))(-1)) in the equalization tank. However, MPs' existing settling/rising velocity models failed to obtain a theoretical SOR. In cyclic activated sludge systems, reducing sludge wastage was proposed to facilitate the removal of MPs. As a result, outlet MPs could be reduced by an order of magnitude by adjusting operational parameters on rainy days. Our study highlighted the potential for WWTP to operate as a controlled source of MPs by altering the operational parameters. We also advocated exploiting the mechanisms of MPs' removal by operational parameters and finding an equilibrium between MPs' removal and activated sludge performance.