期刊：
Science of The Total Environment,2024年908:168319 ISSN：0048-9697
通讯作者：
Wan, DJ;Gu, JF
作者机构：
[Wan, Da-juan] Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.;[Yang, Wen-jun; Liao, Bo-han; Zeng, Peng; Gu, Jiao-feng; Zhou, Hang] Hunan Prov Key Lab Wetland & Soil Ecol Remediat, Changsha 410004, Peoples R China.
通讯机构：
[Wan, DJ ] H;[Gu, JF ] C;Hunan Normal Univ, Sch Geog Sci, Changsha 410081, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Hunan Engn Lab Control Rice Qual & Safety, Changsha 410004, Peoples R China.
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 112-149 g & sdot;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 43.8-92.3 g & sdot;hm- 2, respectively. Under the two rotation systems, these integrated management measures can remove Cd and Pb up to 438 g & sdot;hm- 2 & sdot;year- 1 and 149 g & sdot;hm- 2 & sdot;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.
作者机构：
[Liao, Bo-Han; Yi, Xuan-Tao; Zhou, Hang; Gu, Jiao-Feng] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Li, Qian; You, Ping; Ouyang, Kun] Hunan Hermes Safe Environmental Protection Science Co., Ltd., Changsha 410100, China;[Ouyang, Kun] Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650504, China;[Li, Qian] School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
关键词：
cadmium-arsenic;husk ash;rice;silicon(Si);soil enzyme;soil microbial community
摘要：
A rice pot experiment was conducted to identify the effect of silica fertilizer prepared from husk ash on the soil bioavailability of cadmium (Cd) and arsenic (As), enzyme activities, microbial community structure, and heavy metal content in brown rice at different growth stages. The results showed that the application of 0.1%-1.0% silica fertilizer-husk ash increased the pH value of soil by 0.04-0.24 units and the content of soil available silicon by 44.2%-97.5%. It also decreased the content of available Cd and available As by 16.2%-21.4% and 16.0%-24.9%, respectively. With the increase in application amount, the soil enzyme activities increased at all growth stages, and the sucrase activity and the dehydrogenase activity significantly increased by 6.3%-145.7% and 6.7%-224.1%, respectively. The analysis of the soil microbial community composition structure at mature stages showed that the application of silica fertilizer-husk ash had no effect on microbial α-diversity, but it had a significant effect on microbial β-diversity and then promoted microbial growth and maintained the stability of the community structure. With the increase in application amount, the contents of Cd in brown rice decreased by 29.3%-89.7%, and the contents of total As and inorganic As in brown rice decreased by 7.8%-42.3% and 17.2%-44.5%, respectively. Under the application of 0.5% and 1.0% silica fertilizer-husk ash, the Cd contents in brown rice were lower than 0.2 mg·kg(-1), and the inorganic As contents in brown rice were lower than 0.35 mg·kg(-1). In conclusion, the silica fertilizer-husk ash can improve soil quality and reduce the contents of Cd and As in brown rice, and it is eco-friendly and can be used to remedy the paddy soil contaminated with Cd and As.
摘要：
In this study, the manganese oxide/biochar composites (Mn@BC) were synthesized from Phytolacca acinosa Roxb. The Mn@BC was analyzed via techniques of Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction analysis (XRD). The results show that MnO(x) is successfully loaded on the surface of BC, and the load of MnO(x) can increase the number of surface functional groups of BC. X-ray photoelectron spectroscopy (XPS) shows that MnO(x) loaded on BC mainly exists in three valence forms: Mn(Ⅱ), Mn(Ⅲ), and Mn(Ⅳ). The ability of Mn@BC to activate periodate (PI) was studied by simulating the degradation of methylene blue (MB) dye. The degradation experiment results showed that the MB removal rate by the Mn@BC/PI system reached 97.4% within 30min. The quenching experiment and electron paramagnetic resonance (EPR) analysis confirmed that Mn@BC can activate PI to produce iodate (IO(3)•), singlet oxygen ((1)O(2)), and hydroxyl radical (•OH), which can degrade MB during the reaction. Response surface methodology (RSM) based on Box-Behnken Design (BBD) was used to determine the interaction between pH, Mn@BC and PI concentration in the Mn@BC/PI system, and the optimum technological parameters were determined. When pH=5.4, Mn@BC concentration 0.56mg/L, PI concentration 1.1mmol/L, MB removal rate can reach 98.05%. The cyclic experiments show that Mn@BC can be reused. After four consecutive runs, the removal rate of MB by the Mn@BC/PI system is still 82%, and the Mn@BC/PI system also shows high performance in treating MB in actual water bodies and degrading other pollutants. This study provides a practical method for degrading dyes in natural sewage.
关键词：
MXene/g-C 3 N 4 heterojunction;Photocatalysis;Degradation;Ciprofloxacin
摘要：
The extensive use of ciprofloxacin (CIP) poses a great threat to aquatic ecosystem, due to its potentially serious inhibitory effect on the microbial activity and low natural degradation rate. Photocatalytic degradation has emerged as a feasible method for treating CIP pollution. In this study, Ti3C2 reinforced g-C3N4 heterojunction material (MX/CN) was prepared using solvent drying method. The heterojunction composite accelerated the electron transfer rate, and the resulting MX/CN exhibited superior photocatalytic activity against CIP under visible light driving. The MX/CN sample achieved higher CIP photocatalytic removal rate of 97.8 %, 1.23 times higher than CN. Moreover, 6 %-MX/CN showed the best photocatalytic activity at pH = 7 when the initial concentration of CIP was 10 mg/L. Under neutral condition, the presence of Cl-, NO3 �, and HCO3 � reduced the degradation of CIP, where the addition of HCO3- caused a competed redox reaction with center dot OH in the system, resulting in a reduction of the CIP degradation efficiency to 30.9 %. The photocatalytic mechanism involving MX/CN was proposed according to the trapping experiments of active species, which confirmed that center dot O2 � was the primary active component in photocatalytic degradation of CIP and h+ and center dot OH also played significant roles. Finally, cycling experiments using MX/CN showed that the CIP degradation efficiency maintained more than 90 % after five cycles.
摘要：
Dredged sediment has a high-water content and complex contaminant composition, dramatically impacting the environment if not treated and managed correctly. However, at the same time, it is also a valuable phosphorusrich resource. Treating contaminated dredged sediments for resource recycling is critical to achieving sustainable development goals. In this study, a novelty neutral pH electro-Fenton (EF) experimental device was specifically designed for phosphorus (P) transformation study in dredged sediment. Result showed that the transformation of P forms in dredged sediments due to & sdot;OH generation in this EF system. The decrease rates of organic P (OP) and apatite P (Ca-P) were 21.8 % and 69.6 %, respectively, while, the increase rates inorganic P (IP) and non-apatite inorganic P (Fe-P) were 25.2 % and 250.0 %, respectively, after 6 h of EF reaction. Analysis of the microbial community revealed that the EF reaction did not significantly reduce microbial diversity in the dredged sediment (p > 0.05). Furthermore, the abundance of Massilia and Thiobacillus, which are involved in transforming P form, increased significantly following the EF reaction and was positively correlated with Fe-P and IP (R2 > 0.999) and negatively correlated with OP and Ca-P (R2 > 0.999). This study proves that treating polluted dredged sediment with a neutral pH EF system can transform P into bioavailable forms. This work provides a new and sustainable strategy for recycling P from phosphorus-rich waste streams as a substitute for mining P rock.
摘要：
A novelty in-situ heterogeneous electro-Fenton based on boron-modified and co-modified carbon felts (CF) such as B-CF, B, Fe-CF and B, Co-CF was employed for phosphorus nutrients treatment in dredged sediment. During which B, Fe-CF (1:1) was the optimal cathode for phosphorus nutrients and organic matter treatment with organic phosphorus (OP) and non-apatite inorganic phosphorus (Fe-P) conversion rates of 26.84% and 63.21%, respectively, since the generated H2O2 on bifunctional cathode could produce center dot OH with material surface reduced Fe(II). Characterized by SEM, XRD and XPS, B and Fe were successfully loaded on the electrode with elemental percentages of 0.99% and 4.40%, while B2O3 and Fe2O3 were detected. The operating parameters like initial pH and current density were explored. B, Fe-CF had a high stability and outstanding catalytic capacity for 5 cycles of phosphorus nutrient treatment. The possible mechanism was also proposed based on the electron paramagnetic resonance (EPR) and radical quenching experiment, which demonstrated that center dot OH and SO4 center dot- mainly contributed to phosphorus nutrients treatment. In this work, a highly efficient and stable carbon material was successfully prepared to treat refractory pollutants in dredging sediment, which provides new ideas and methods for subsequent resource utilization.
摘要：
Metal sulfides have gained significant attention as cocatalysts for Fenton/Fenton-like processes in recent years due to their ability to reduce trivalent iron (Fe3+). Nevertheless, the issue of hydrogen sulfide (H2S) formation as a secondary contaminant is a significant concern. In this work, tungsten carbide (WC) was innovatively intro-duced into the Fenton-like process based on ferrous ion/peroxymonosulfate (Fe2+/PMS). The results showed that the WC/Fe2+/PMS system had a significantly higher degradation efficiency and rate for tetracycline hydro-chloride (TC) than the Fe2+/PMS system. The WC/Fe2+/PMS system can work efficiently over a wide pH range (2.8-8.5), and WC has excellent reusability with negligible metal leaching. X-ray photoelectron spectrum analysis proved that the presence of W(IV) on the WC surface contributes to its excellent co-catalytic performance. Electrochemical characterization indicated that WC can facilitate the electron transfer of the system. Electron Paramagnetic Resonance analysis demonstrated that WC significantly improves the generation of four oxidative species by the Fe2+/PMS system as a result of the enhanced PMS activation due to the continuous reduction of Fe(III) by WC. Moreover, the WC/Fe2+/PMS system can work effectively under a complex water matrix and has an excellent degradation effect on other pollutants. In summary, this study provides a novel and eco-friendly cocatalyst to accelerate the Fe3+/Fe2+ cycle and activate PMS for TC degradation.
期刊：
Chemical Engineering Journal,2024年486:149979 ISSN：1385-8947
通讯作者：
Weiping Xiong<&wdkj&>Zhaohui Yang
作者机构：
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;[Rui Xu] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China;[Yanru Zhang] Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou 350007, PR China;[Meiying Jia] Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China
通讯机构：
[Weiping Xiong; Zhaohui Yang] C;College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China<&wdkj&>Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
摘要：
Antibiotics and microplastics are emerging contaminants of widespread concern. Individual exposure to either antibiotics or microplastics may facilitate the dissemination of antibiotic resistance genes (ARGs). However, little is known about how the co-exposure of antibiotics and microplastics drives the dissemination of ARGs during sludge anaerobic digestion. This study established a series of long-term operational anaerobic digesters and found that 20 mg/L ofloxacin facilitated the dissemination of ARGs, whereas 200 mg/L ofloxacin led to a decrease in the absolute abundance of ARGs. However, the coexistence of polyamide and ofloxacin further increased the abundance of five ARGs by 4.4–359.1 % compare to singular ofloxacin exposure. The presence of polyamide not only complicated the microbial community structure but also increased the abundance of ARGs hosts by 12.2–108.7 %. Metagenome-assembled genomes indicated that 42 out of 53 ARGs hosts were functional microorganisms, and their enrichment under polyamide exposure facilitated the conversion of substrates into methane. Further mechanism exploration found that ofloxacin and polyamide promoted the formation of biofilm and enhanced the adhesion and communication among microorganisms. The upregulation of functional genes related to antioxidant, DNA repair, and type IV secretion systems provided evidence for the stimulated horizontal transfer of ARGs under the co-exposure of ofloxacin and polyamide. Partial least squares path modeling analysis identified that mobile genetic elements predominantly determined the variation of ARGs in this study. These findings emphasized that the coexistence of microplastics and antibiotics in sludge may further exacerbate the risk of antibiotic resistance transmission.
期刊：
Process Safety and Environmental Protection,2024年182:405-415 ISSN：0957-5820
通讯作者：
Xu, T
作者机构：
[Tang, Xiting; Zeng, Zhen] Cent South Univ Forestry & Technol, Sch Life Sci & technol, Changsha 410004, Peoples R China.;[Xu, T; Zhou, Yihui; Xu, Tao] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Wu, Qingyu; Liu, Kang; Hu, Simeng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Xu, Tao; Yu, Gang] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Zhou, Yihui; He, Miao] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Xu, T ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
Sinusoidal alternating current coagulation;Heavy metal ions;Process evaluation;Adsorption behavior;Removal mechanism
摘要：
A novel photovoltaic energy-sinusoidal alternating current coagulation (PE-SACC) system was proposed for the removal of heavy metal ions (HMs) in electroplating wastewater. A response surface methodology was used to study the combined effect of two factors on removal efficiency (Re) and energy consumption (EEC), and the optimal process parameters were obtained. The morphology, surface element content, crystal structure, and chemical composition of the flocs generated during the electrocoagulation (EC) process were characterized using SEM, EDS, XRD, FTIR, and XPS techniques. The intra-particle diffusion model was used to describe the adsorption behavior of HMs (Cu2+, Zn2+ and Ni2+) by flocs. Finally, the removal mechanism of HMs by SACC technology and its application in actual wastewater treatment were discussed in detail. The results revealed that when c(0)(Ni2+) = c(0)(Zn2+) = c(0)(Cu2+) = 50 mg.dm(-3), c (Cl ) over bar = 100 mg.dm(-3), pH(0) = 10, j = 1.3 A.m(-2), t = 85 min, the Re(Cu2+), Re(Zn2+) and Re(Ni2+) were 99.3%, 99.1%, and 98.4%, respectively, and the EEC was 0.105 kWh.m(-3). Compared with the traditional direct current coagulation (DCC), EEC, electrode consumption, and sludge production in SACC mode were reduced by 37.1%, 62.2%, and 66.6%, respectively. The PE-SACC system achieved ultra-low cost treatment of heavy metal electroplating wastewater. The adsorption process included surface adsorption, pore adsorption, and adsorption equilibrium. The mechanisms for the removal of HMs included cathode reduction, alkaline precipitation, and adsorption. In the actual wastewater treatment process, the removal efficiency of HMs could still be maintained above 99%, and the effluent met the national discharge standard (GB 31574-2015). This study presented an economically and environmentally sustainable approach for the evolution and industrial utilization of novel electrocoagulation technologies.
期刊：
Separation and Purification Technology,2024年334:126093 ISSN：1383-5866
通讯作者：
Ma, XC;Li, LQ;Su, RK
作者机构：
[Ma, Xiancheng; Xu, Wenjun] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.;[Li, Liqing; Li, LQ; Zeng, Zheng; Guo, Yang] Cent South Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Su, Rongkui; Wang, Hanqing; Su, RK] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Zhou, Yihui] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Hunan, Peoples R China.
通讯机构：
[Li, LQ ; Su, RK ; Ma, XC ] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.;Cent South Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410083, Hunan, Peoples R China.
关键词：
Porous carbon;Acetone and methanol adsorption;Azeotrope separation;Pore structure;Nitrogen and oxygen groups
摘要：
The adsorption and separation of methanol and acetone are crucial for environmental protection and recycling. However, the separation of methanol and acetone azeotropes using carbon-based materials remains challenging, and the underlying mechanism is still unclear. Here, we propose the synthesis of porous carbon (NaOCs) using benzimidazole as a precursor and NaOH as an activator. With the increase of the proportion of NaOH and benzimidazole, the activation reaction was intensified, leading to the formation of numerous mesopores. NaOCs exhibit a maximum specific surface area (SBET) of 3084 m2/g, and has extremely high adsorption capacity of methanol (56.9 mmol/g at 13 kPa) and acetone (34.6 mmol/g at 18 kPa) at 25 degrees C. The results of experiments and molecular simulations indicate that the saturation adsorption capacity of methanol and acetone is determined by micropores and narrow mesopores at 25 degrees C, whereas the adsorption capacity at relatively low pressure is primary determined by ultramicropores and oxygen group. Furthermore, for methanol-acetone azeotropes separation, the acetone/methanol selectivity at low pressure depends on carbon surface polarity and ultramicropore, while methanol/acetone selectivity at high pressure depends on micropores of 1-2 nm. Our findings provide insights into the design and further development of adsorbents for VOCs adsorption and azeotrope separation applications.
关键词：
MOFs;Arsenic;Peroxymonosulfate;Adsorption and catalysis;DFT
摘要：
The removal of arsenic from contaminated water is important for environmental protection and drinking water safety worldwide. In this study, bimetallic metal-organic frameworks (MOFs) with catalytic and adsorptive ef-fects were synthesized and combined with peroxymonosulfate (PMS) for efficient As(III) oxidation and As(III)/As (V) removal. The molar ratio of Fe and Mn precursor was adjusted to balance the adsorption and catalytic processes of As(III) in the system. The results showed that among the Fe/Mn-MOFs and MIL-88(Fe) tested, the Fe/Mn-MOFs with an Fe/Mn molar ratio of 1:1 (Fe0.3Mn0.3-MOFs) could achieve the best catalytic and adsorption performance with 98% removal of As(III). The performance of Fe0.3Mn0.3-MOFs in natural contam-inated water was also verified. Electron spin resonance detection and quenching experiments have revealed that trivalent arsenic oxidation is facilitated primarily by a non-radical process through singlet oxygen. Density-functional theory, XPS and FTIR analyses reveal the structures, corresponding binding energies and binding sites for the adsorption of As(III)/As(V) by Fe0.3Mn0.3-MOFs. The coupling of Fe0.3Mn0.3-MOFs to the PMS system was still able to achieve 78% arsenic removal after five cycles, showing good reliability and effectiveness in arsenic removal. This study provides a new insight into the catalytic and adsorption mechanisms in MOFs/PMS systems and provides a theoretical basis for the application of MOFs in the remediation of arsenic contaminated water.
摘要：
Cadmium (Cd) pollution in aqueous solution has caused great threat to human health. A novel chitosan and biochar supported sulfide-modified nZVI composite (CB-S-nZVI) was synthesized by liquid phase reduction method and applied to the removal of Cd2+ from wastewater. The synthesized materials were characterized by SEM, BET, XRD, FTIR, and zeta potential. Batch experiments showed that the optimum synthesis conditions of CB-S-nZVI were the S/Fe molar ratio of 0.56 and the Fe/BC mass ratio of 2. The removal capacity of Cd2+ by CB-S-nZVI increased with the increase of pH and reached the maximum of 249.92 mg/g at pH of 9. Among the competitive cations, Pb2+ and Cu(2+ )had a strong inhibition to the removal ofCd(2+). The removal process of Cd2+ conformed to the pseudo-second-order kinetic model and the Freundlich model, and it was exothermic. XPS analysis suggested that the removal mechanism of Cd2+ was mainly through electrostatic attraction, precipitation, and complexation. Overall, these findings provide new insights into the development of new nZVI-modified material, and CB-S-nZVI is promising in removing heavy metals from wastewater.
作者机构：
Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning 530012, China;[Jiangnan Li; Xionghui Liao] Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, China;Author to whom correspondence should be addressed.;[Peiqin Peng] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Jie Zhao] G;Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning 530012, China<&wdkj&>Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China<&wdkj&>Huanjiang Agriculture Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Karst Ecological Processes and Services, Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang 547100, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Soil microorganisms are vital components of the karst terrestrial ecosystem. However, their responses to the vegetation succession on karst mountain peaks remain unclear as to whether soil microbial diversity and community compositions change with vegetation succession. We investigated the diversity and community compositions of soil bacteria and fungi and associated environmental factors along a vegetation succession from moss crusts (MC) to moss crusts with sparse grasses (MCG) to sparse grasses (G) on karst mountain peaks. The results indicated that soil organic carbon and total nitrogen generally increased, and soil pH changed in the range of 8.19–8.44 and slightly declined with vegetation succession. Overall, there was an increase in microbial biomass along the vegetation succession, with the dominant phyla of bacteria, including Proteobacteria, Acidobacteria, Actinobacteria, Choroflexi, Gemmatiomnadates, Bacteroidetes, and Planctomycetes, and the dominated phyla of fungi, including Basidiomycota and Ascomycota. Notably, both the bacterial and fungal community compositions were different among the three successional stages. Spearman’s correction analysis showed that soil organic carbon and total nitrogen had stronger and more significant influences on the soil microbial community compositions compared to soil water content, pH, and C:N ratio. Overall, our results provide evidence for the changes and influencing factors of the microbial community with the succession vegetation on karst mountain peaks.
摘要：
Transition metals and their oxide compounds exhibit excellent chemical reactivity; however, their easy agglomeration and high cost limit their catalysis applications. In this study, an interpolation structure of a Myriophyllum verticillatum L. biochar-supported Mn/Mg composite (Mn/Mg@MV) was prepared to degrade triphenyl phosphate (TPhP) from wastewater through the activating periodate (PI) process. Interestingly, the Mn/Mg@MV composite showed strong radical self-producing capacities. The Mn/Mg@MV system degraded 93.34% TPhP (pH 5, 10 mu M) within 150 min. The experimental results confirmed that the predominant role of IO3 center dot and the auxiliary center dot OH jointly contributed to the TPhP degradation. In addition, the TPhP pollutants were degraded to various intermediates and subsequent Mg mineral phase mineralization via mechanisms like interfacial processes and radical oxidation. DFT theoretical calculations further indicated that the synergy between Mn and Mg induced the charge transfer of the carbon-based surface, leading to the formation of an center dot OH radical-enriched surface and enhancing the multivariate interface process of center dot OH, IO3, and Mn(VII) to TPhP degradation, resulting in the further formation of Mg PO4 mineralization.
作者机构：
[Xing, Liping; Liu, Jiahao; Xia, Jing; Ding, Ziyi; Wang, Ping; Lan, Jiaxin] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China;[Zhou, Lean] Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province/School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China;[Cai, Jingju] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: caijj7692@csuft.edu.cn;[Zhu, Jian] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China. Electronic address: znlzhujian@csuft.edu.cn
通讯机构：
[Jingju Cai; Jian Zhu] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
摘要：
Electrochemical activation of persulfate (EA-PS) is gradually attracting attention as an emerging method for wastewater treatment. In this study, a novelty flow-through EA-PS system was first attempted for pollutants degradation using boron and cobalt co-doping carbon felt (B, Co-CF) as the cathode. SEM images, XPS and XRD spectra of B, Co-CF were investigated. The optimal doping ration between B and Co was 1:2. Increasing current density, PS concentration and flow rate, decreasing initial pH accelerated the removal of AO7. The mechanism involved in EA-PS were the comprehensive effect of DET, (•)OH and SO(4)(•-). B, Co-CF cathode for flow-through system was stable with five cycles efficient AO7 decay performance. EA-PS in flow-through system was an efficient method with low cost and efficient pollutants degradation. This work provides a feasible strategy for synergistically enhancing PS activation and promoting the degradation of organic pollutants.
通讯机构：
[Huang, C ] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
关键词：
CiteSpace;Environmental remediation;Knowledge mapping;Scientometric analysis;Zero-valent iron
摘要：
Zero-valent iron (ZVI)-based materials are among the most widely used engineered particles in the field of environmental remediation. To provide a comprehensive overview of the status and trend of the research on them, this study conducted a quantitative and visual analysis of 6296 relevant publications obtained from Web of Science between 1994 and 2022 using CiteSpace software. By using the bibliometric method, this work systematically analyzed the knowledge structure, research hotspots and trends of ZVI-based materials in this field. The results show that the research on ZVI-based materials in this field developed rapidly over the past 28 years. China is the greatest contributor with the most published articles and collaborations. Still, the USA has the most academic influence with the highest average citations per article. Chinese Academy of Sciences and Tongji University are the primary establishments that produced the greatest number of publications and had the highest h-index. Keyword cluster analysis indicates that the primary research topics are related to reductive dechlorination, sulfate radical, arsenic removal, graphene oxide, porous media, peroxymonosulfate, groundwater remediation, and permeable reactive barrier. Meanwhile, keyword burst analysis reveals that the primary research hotspots and frontiers of ZVI focus on its modification, the refractory and emerging contaminants treatment, persulfate activation, and electron transfer. However, no keywords or topics related to the environmental impact and toxicity of ZVI-based materials are available in the keyword clustering and burst analysis results, indicating this direction deserves more attention in future research. Through a comprehensive and in-depth bibliometric analysis, this paper provides new insight into the research hotspots and development trends of the research on ZVI-based materials in environmental remediation.
摘要：
Traditional powder-coated photoanodes suffer from poor interfacial-tightness and high complex interfacial mass transfer resistance. In addition, the treatment rate of photoanodes on antibiotics is limited due to the electrode active area and the mutual restriction between the electrode and the height of treated liquid. Ar-ZnO/Ti3+-TiO2- NTs photoanode in this study solved the above problems. Ti3+-TiO2 nanotubes (Ti3+-TiO2-NTs) after electro-chemical reduction were used as the conductive substrate. MOF-5 was grown in situ on the substrate by pulsed deposition and microwave hydrothermal self-assembly, which provided both high active sites and effective photosensitivity. Finally, Ar-ZnO/Ti3+-TiO2-NTs photoanode was constructed after reduction atmosphere sculpture. The stable structure of TiO2 hollow nanotubes and the three-dimensional network structure of MOF-5 were beneficial to improve the high-pressure resistance of the structure in the process of photoanode application. Meanwhile, the reduced self-doping of Ti3+ enhanced the substrate conductivity, the pulsed deposition of Zn decreased ion leaching, and the microwave accelerated the self-assembly process of MOF-5. The Ar-ZnO/Ti3+- TiO2-NTs photoanode performed excellent degradability for multiple antibiotics (greater than 90%, 60 min) with the photoelectrocatalytic synergy factor of 21.16, and the performance was maintained after three months. This work enriched photoelectrode development, and provide novel ideas for MOFs to participate in antibiotic removal.
