期刊：
Land Degradation & Development,2025年:- ISSN：1085-3278
通讯作者：
Wentao Yang
作者机构：
[Yonglin Chen; Wentao Yang; Haonan Jing; Jian Zhang; Bing Wang; Liyu Yang; Pan Wu] Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, College of Resource and Environmental Engineering, Guizhou University, Guiyang, China;[Hang Zhou] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China;[Nabeel Khan Niazi] Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, Pakistan;[Zhenjie Zhao] Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, School of Public Health, Guizhou Medical University, Guiyang, China;[Shengsen Wang] College of Environmental Science and Engineering, Yangzhou University, Yangzhou, China
通讯机构：
[Wentao Yang] K;Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, College of Resource and Environmental Engineering, Guizhou University, Guiyang, China
摘要：
Cadmium (Cd)-contaminated rice paddies have been a primary environmental concern worldwide. Biochar or modified biochar application favors reducing Cd availability in paddy soil, which has been demonstrated in physical and chemical terms. However, we know little about soil microbial responses after biochar application. In this study, we revealed the immobilization effect and mechanism of Cd in paddy fields by a novel phosphorite magnetic biochar (PMCB) from the perspective of soil microbial response. The results suggested that PMCB application facilitated the conversion of highly active Cd to less active Cd in soil and reduced Cd uptake by rice by improving soil physicochemical properties and functional bacterial and gene abundance. Compared with the control, acetic acid extractable Cd and reducible Cd contents in soil and Cd content in brown rice decreased by 7.4%–18.4%, 16.2%–19.9%, and 44.0%–47.9%, respectively, and residual Cd content increased by 16.3%–25.8% under PMCB treatment. A decrease in sqr and fccB gene abundances (downregulated by 6.3% and 12.4%, respectively) inhibited CdS oxidative dissolution after 0.2% PMCB application. Conversely, other treatments stimulated the abundant proliferation of functional microbes (e.g., Anaeromyxobacter , Geobacter , and Thiobacillus ) and these genes while suppressing sulfide-producing gene abundance (sreA and phsA decreased by 30.5%–73.4% and 3.3%–11.3%, respectively). This result implies that Fe(III) mineral reduction and CdS oxidation lead to a limited secondary release of Cd. Additionally, aqueous-phase analysis of the immobilization mechanism revealed that PMCB immobilized Cd mainly by coprecipitation with PO 4 3− and CO 3 2− (34.5%) and ion exchange (32.2%), followed by surface complexation (18.7%) and cation π-bonding (13.1%).
摘要：
The development of a photoelectrode featuring both excellent reusability and a simple preparation process remains exceptionally challenging for TiO2-based photoelectrocatalytic technology. Herein, a three-dimensional photoelectrode with N doping, oxygen vacancies (Ovs), and carbon layers (NTC) was prepared via the "carbothermal reduction-pressing-calcination" method. The photoelectrode degraded 97.94% of tetracycline (TC) within 60 min. The first-order kinetic constant for this degradation was 27.3 times higher than that of TiO2-x, and the photoelectric synergy factor reached as high as 13.9. The photoelectrode also demonstrated outstanding anti-interference capability for pH, electrolyte concentration, anions, etc., and was suitable for different water matrixes and various antibiotics removal. In particular, the degradation efficiency of TC decreased by only 1.33% after 20 cycles, demonstrating the excellent reusability of NTC. Furthermore, photoexcited holes (h+) were the dominant active species, and singlet oxygen (1O2) and superoxide radicals (•O2−) played an auxiliary role in removing TC. Finally, possible degradation pathways for TC were proposed and demonstrated to be effective in reducing the toxicity of the pollutant by the Toxicity Evaluation Software Tool (T.E.S.T) and phytotoxicity experiments. This progress might bring new insights into the design and construction of TiO2-based photoelectrodes.
The development of a photoelectrode featuring both excellent reusability and a simple preparation process remains exceptionally challenging for TiO2-based photoelectrocatalytic technology. Herein, a three-dimensional photoelectrode with N doping, oxygen vacancies (Ovs), and carbon layers (NTC) was prepared via the "carbothermal reduction-pressing-calcination" method. The photoelectrode degraded 97.94% of tetracycline (TC) within 60 min. The first-order kinetic constant for this degradation was 27.3 times higher than that of TiO2-x, and the photoelectric synergy factor reached as high as 13.9. The photoelectrode also demonstrated outstanding anti-interference capability for pH, electrolyte concentration, anions, etc., and was suitable for different water matrixes and various antibiotics removal. In particular, the degradation efficiency of TC decreased by only 1.33% after 20 cycles, demonstrating the excellent reusability of NTC. Furthermore, photoexcited holes (h+) were the dominant active species, and singlet oxygen (1O2) and superoxide radicals (•O2−) played an auxiliary role in removing TC. Finally, possible degradation pathways for TC were proposed and demonstrated to be effective in reducing the toxicity of the pollutant by the Toxicity Evaluation Software Tool (T.E.S.T) and phytotoxicity experiments. This progress might bring new insights into the design and construction of TiO2-based photoelectrodes.
关键词：
Policy;FVC;Artificial reclamation;Remote sensing;Historic mines;Moran index
摘要：
The vegetation in Huayuan County was seriously damaged during the mining process. Using remote sensing data, the vegetation coverage in the Huayuan County lead–zinc mining area was analysed to explore the temporal trends and driving factors of the FVC. As calculated from remote sensing data, the average FVC decreased rapidly from 0.74 to 0.36 from 2000--2008, with no significant change from 2009 to -2018, and gradually recovered from 0.36 to 0.5 from 2019--2024. Two typical mining areas were selected for research. After artificial reclamation, the damaged vegetation can be restored, whereas the vegetation in the naturally restored mining area is difficult to restore. The cluster map of the mining area is obtained via the Moran index, which reveals that artificial reclamation has an obvious effect on vegetation restoration. The destruction of vegetation in mining areas is affected primarily by human activities, while human activities are affected primarily by changes in policy; thus, policy factors are the main factors driving changes in vegetation in mining areas, whereas natural factors have a small influence on changes in the FVC in mining areas. This study provides a theoretical basis for vegetation restoration in other mining areas and promotes sustainable development.
The vegetation in Huayuan County was seriously damaged during the mining process. Using remote sensing data, the vegetation coverage in the Huayuan County lead–zinc mining area was analysed to explore the temporal trends and driving factors of the FVC. As calculated from remote sensing data, the average FVC decreased rapidly from 0.74 to 0.36 from 2000--2008, with no significant change from 2009 to -2018, and gradually recovered from 0.36 to 0.5 from 2019--2024. Two typical mining areas were selected for research. After artificial reclamation, the damaged vegetation can be restored, whereas the vegetation in the naturally restored mining area is difficult to restore. The cluster map of the mining area is obtained via the Moran index, which reveals that artificial reclamation has an obvious effect on vegetation restoration. The destruction of vegetation in mining areas is affected primarily by human activities, while human activities are affected primarily by changes in policy; thus, policy factors are the main factors driving changes in vegetation in mining areas, whereas natural factors have a small influence on changes in the FVC in mining areas. This study provides a theoretical basis for vegetation restoration in other mining areas and promotes sustainable development.
摘要：
Herein, a novel surfactant dihexyl (2-amino-2-(hydroxyimino)ethyl) phosphonate (DHAHEP) was synthesized by combining phosphonate and amidoxime groups in the same molecule, and used as a flotation collector for quartz vein-type wolframite. The Micro-flotation results showed that DHAHEP has excellent collection performance for wolframite, at pH 2 ∼ 4.5, the flotation recovery of DHAHEP for wolframite was over 90 %, while that for quartz was less than 60 %. The wolframite-quartz artificial mixed ores experiments demonstrated that at pH ∼ 4 and DHAHEP concentration of 8 × 10-5 mol·L-1, the flotation recovery of wolframite was 64.5 % and the grade was 48.9 %. Zeta potential and contact angle experiments elucidated that DHAHEP anchored on the wolframite surface mainly in the form of cations, increasing the hydrophobicity of the surface and thus separating the wolframite from quartz by flotation. FTIR, XPS, and DFT calculation further revealed that DHAHEP had an obvious flotation separation effect on quartz vein-type wolframite, it was mainly electrostatically adsorbed on the WO42- sites of the wolframite surface in the form of cations, and also captured wolframite by forming chemical bonds with the Fe active sites through the phosphoryl and amidoxime groups in its molecular structure.
Herein, a novel surfactant dihexyl (2-amino-2-(hydroxyimino)ethyl) phosphonate (DHAHEP) was synthesized by combining phosphonate and amidoxime groups in the same molecule, and used as a flotation collector for quartz vein-type wolframite. The Micro-flotation results showed that DHAHEP has excellent collection performance for wolframite, at pH 2 ∼ 4.5, the flotation recovery of DHAHEP for wolframite was over 90 %, while that for quartz was less than 60 %. The wolframite-quartz artificial mixed ores experiments demonstrated that at pH ∼ 4 and DHAHEP concentration of 8 × 10-5 mol·L-1, the flotation recovery of wolframite was 64.5 % and the grade was 48.9 %. Zeta potential and contact angle experiments elucidated that DHAHEP anchored on the wolframite surface mainly in the form of cations, increasing the hydrophobicity of the surface and thus separating the wolframite from quartz by flotation. FTIR, XPS, and DFT calculation further revealed that DHAHEP had an obvious flotation separation effect on quartz vein-type wolframite, it was mainly electrostatically adsorbed on the WO42- sites of the wolframite surface in the form of cations, and also captured wolframite by forming chemical bonds with the Fe active sites through the phosphoryl and amidoxime groups in its molecular structure.
作者机构：
[Min Zhang; Chuang Li; Xiaofei Tan] College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;[Shaobo Liu; Jiang Li] School of Architecture and Art, Central South University, Changsha 410083, PR China;[Jiaming Hong; Yifan Jiang; Xinjiang Hu] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
通讯机构：
[Xinjiang Hu; Xiaofei Tan] C;College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China<&wdkj&>College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China
摘要：
The accumulation of environmental pollutants and dust, along with the formation of dirt, has led to severe surface contamination, resulting in the deterioration and contamination of substrate surfaces, which has significantly escalated cleaning and maintenance expenses. Although various anti-dust surfaces have been developed in previous studies, challenges still persist in achieving long-lasting dust protection while maintaining transparency and functional diversity. The present study aims to develop a three-layer composite coating, which exhibits superhydrophilic self-cleaning performances and can be applied onto various substrates at ambient temperature. This innovative coating integrates the principles of anti-static behavior and micro-nanostructured surface topography to effectively prevent dust accumulation. The surface resistance of the coating can be maintained in the range of 10 4 –10 6 Ω/sq, ensuring long-lasting dust resistance in outdoor environments and facilitating self-cleaning of the coated surfaces due to their superhydrophilic properties (water contact angle less than 5°). In addition, the coating exhibits exceptional transmittance with a peak transmittance of 97 % within the 400–800 nm wavelength range. This attribute renders it highly suitable for extensive utilization in applications such as photovoltaics, glass facades, and other fields that demand superior transparency. Notably, by ingeniously incorporating cellulose nanocrystals renowned for their remarkable mechanical properties, the coating achieves a hardness rating of 6 H at room temperature, thereby meeting outdoor requirements across various scenarios.
The accumulation of environmental pollutants and dust, along with the formation of dirt, has led to severe surface contamination, resulting in the deterioration and contamination of substrate surfaces, which has significantly escalated cleaning and maintenance expenses. Although various anti-dust surfaces have been developed in previous studies, challenges still persist in achieving long-lasting dust protection while maintaining transparency and functional diversity. The present study aims to develop a three-layer composite coating, which exhibits superhydrophilic self-cleaning performances and can be applied onto various substrates at ambient temperature. This innovative coating integrates the principles of anti-static behavior and micro-nanostructured surface topography to effectively prevent dust accumulation. The surface resistance of the coating can be maintained in the range of 10 4 –10 6 Ω/sq, ensuring long-lasting dust resistance in outdoor environments and facilitating self-cleaning of the coated surfaces due to their superhydrophilic properties (water contact angle less than 5°). In addition, the coating exhibits exceptional transmittance with a peak transmittance of 97 % within the 400–800 nm wavelength range. This attribute renders it highly suitable for extensive utilization in applications such as photovoltaics, glass facades, and other fields that demand superior transparency. Notably, by ingeniously incorporating cellulose nanocrystals renowned for their remarkable mechanical properties, the coating achieves a hardness rating of 6 H at room temperature, thereby meeting outdoor requirements across various scenarios.
作者机构：
[Taiyan Sun; Honglin Zhang; Lihaozhe Zou; Chang Zhao; Yanan Liu; Weiping Xiong; Zhaohui Yang] College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China;[Meiying Jia] Yuelushan Laboratory, College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
通讯机构：
[Weiping Xiong; Zhaohui Yang] C;College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
摘要：
The hybrid capacitive deionization (HCDI) technology has demonstrated improved efficiency compared to conventional capacitive deionization (CDI). Prussian blue analogues (PBAs) possess high capacity and rapid ion transfer capability, recognized as promising materials for HCDI electrodes. PBAs with a more uniform morphology and smaller particle size could enhance contact with the electrolyte, and facilitate rapid ion transport. It has been observed that adding manganese can reduce the particle size of these materials and lead to a more uniform structure. In this study, nickel-based Prussian blue analogues were modified with varying manganese doping ratios to enhance desalination properties. The optimal desalination performance was achieved when the atomic ratio of manganese to nickel was 3:7 (MNP-3), yielding a maximum deionization rate of 20.59 mg·(g·min) −1 and a high desalination capacity of 58.82 mg·g −1 in batch mode testing at an applied voltage of 1.2 V in a 500 mg·L −1 NaCl feed solution. Furthermore, MNP-3 exhibited higher specific capacitance and smaller transfer resistance than the undoped material, which were advantageous for sodium ion storage. This study emphasizes the impact of particle size on HCDI performance, providing valuable insights for future HCDI application studies.
The hybrid capacitive deionization (HCDI) technology has demonstrated improved efficiency compared to conventional capacitive deionization (CDI). Prussian blue analogues (PBAs) possess high capacity and rapid ion transfer capability, recognized as promising materials for HCDI electrodes. PBAs with a more uniform morphology and smaller particle size could enhance contact with the electrolyte, and facilitate rapid ion transport. It has been observed that adding manganese can reduce the particle size of these materials and lead to a more uniform structure. In this study, nickel-based Prussian blue analogues were modified with varying manganese doping ratios to enhance desalination properties. The optimal desalination performance was achieved when the atomic ratio of manganese to nickel was 3:7 (MNP-3), yielding a maximum deionization rate of 20.59 mg·(g·min) −1 and a high desalination capacity of 58.82 mg·g −1 in batch mode testing at an applied voltage of 1.2 V in a 500 mg·L −1 NaCl feed solution. Furthermore, MNP-3 exhibited higher specific capacitance and smaller transfer resistance than the undoped material, which were advantageous for sodium ion storage. This study emphasizes the impact of particle size on HCDI performance, providing valuable insights for future HCDI application studies.
作者机构：
[Zhou, Yihui; Yi, Shi; Lei, Xiping; Zhou, YH; Yi, S] Hunan Automot Engn Vocat Coll, Zhuzhou 412001, Peoples R China.;[Zhou, Yihui; Qiu, Jingxian; Zhou, YH] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.;[Peng, Qingjuan] Hunan Univ, Coll Chem & Chem Engn, Changsha, Peoples R China.;[Liu, Kang; Hu, Simeng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha, Peoples R China.;[Cai, Qunhuan] Hunan New Frontier Sci & Tech Co Ltd, Changsha, Peoples R China.
通讯机构：
[Zhou, YH; Yi, S ] H;[Zhou, YH ] A;Hunan Automot Engn Vocat Coll, Zhuzhou 412001, Peoples R China.;Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.
关键词：
Mn2+;Pulse-alternating current coagulation;parameter optimization;removal mechanism;wastewater
摘要：
To assess the effectiveness and underlying mechanism of pulse-alternating current coagulation (PACC) for treating manganese-laden wastewater, we examined the influence of various parameters. Specifically, we investigated the impact of current density, initial pH, initial Mn2+ concentration, electrolyte concentration, and alternating current frequency on the removal efficacy. The removal mechanism was meticulously examined using an adsorption kinetics analysis, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectrum (FTIR), and X-ray Photoelectron Spectroscopy (XPS). The findings indicated that the concentration of R-e(Mn2+) was 99.09% under the specified conditions: j = 2.5 A<middle dot>m(-2), pH(0 )= 7, c(0)(Mn2+) = 50 mg<middle dot>dm(-3), f = 500 Hz, c(0)(NaCl) = 500 mg<middle dot>dm(-3) and t = 40 min. When R-e(Mn2+) = 98%, the energy consumption (EEC) was significantly lower for PACC at 1.23 kWh<middle dot>m(-3), compared to 1.52 kWh<middle dot>m(-3) for direct current condensation (DCC). This indicated a reduction in EEC by 19.1% when using PACC over DCC. The adsorption process of Mn2+ by the iron sol adheres to the principles of pseudo-second order kinetics. The primary component of flocs generated in the PACC process is alpha-FeOOH. The mechanism of Mn2+ removal in the PACC process involved the synthesis of Mn oxides, the formation of metal hydroxide precipitates and adsorption by nano-iron sol. This study provides a theoretical basis and technical support for the application of PACC technology in the field of manganese-containing wastewater treatment. [GRAPHICS] .
摘要：
Manganese ore, as an important strategic metal resource for the country, was subject to unreasonable mining practices and outdated smelting technologies in early China, leading to severe ecological damage in mining areas. This study examines the trends in vegetation cover change in the historical manganese mining areas of Yongzhou under the influence of policy, providing technical references for mitigating the ecological impact of these legacy mining areas and offering a basis for adjusting mine restoration policies. This paper takes the manganese mining area in Yongzhou City, Hunan Province as a case study and selects multiple periods of Landsat satellite images from 2000 to 2023. By calculating the Normalized Difference Vegetation Index (NDVI) and the Fractional Vegetation Coverage (FVC), the spatiotemporal changes and driving factors of vegetation coverage in the Yongzhou manganese mining area from 2000 to 2023 were analyzed. The analysis results show that, in terms of time, from 2000 to 2012, the vegetation coverage in the manganese mining area decreased from 0.58 to 0.21, while from 2013 to 2023, it gradually recovered from 0.21 to 0.40. From a spatial perspective, in areas where artificial reclamation was conducted, the vegetation was mainly mildly and moderately degraded, while in areas where no artificial restoration was carried out, significant vegetation degradation was observed. Mining activities were the primary anthropogenic driving force behind the decrease in vegetation coverage, while effective ecological protection projects and proactive policy guidance were the main anthropogenic driving forces behind the increase in vegetation coverage in the mining area.
作者机构：
[Zhao, Zongwen; Dong, Zhunqin] Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;[Zhao, Zongwen; Dong, Zhunqin] Shandong Humon Smelting Co Ltd, Yantai 264109, Peoples R China.;[Wang, Zhongbing] Nanchang Hangkong Univ, Sch Environm & Chem Engn, Nanchang 330063, Peoples R China.;[Song, Yuxia] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410007, Peoples R China.
通讯机构：
[Wang, ZB ] N;[Zhao, ZW ] C;Cent South Univ, Sch Met & Environm, Changsha 410083, Peoples R China.;Shandong Humon Smelting Co Ltd, Yantai 264109, Peoples R China.;Nanchang Hangkong Univ, Sch Environm & Chem Engn, Nanchang 330063, Peoples R China.
关键词：
amorphous phase;bridging oxygen;chemical corrosion;corundum–mullite refractory material
摘要：
Corundum-mullite refractory material is an important material in rotary kiln incinerators due to its excellent properties, e.g., high temperature stability and chemical resistance, etc. However, in the process of use, the complexity of the sintering process will inevitably produce a large amount of spent corundum-mullite refractory material. Therefore, it is important to study the failure mechanism of corundum-mullite refractory material to prolong its service life. In this manuscript, the scrapping mechanism for the corundum-mullite refractory material was studied by XRD, XPS, SEM-EDS, FTIR, etc. The results indicate that chemical corrosion caused by impurity elements, such as Fe, Ca, Mg, Ti, etc., is one of the important scrapping mechanisms. The corundum structure remains stable throughout the service life, while mullite exhibits the opposite phenomenon. The Al-O-Si bonds in the mullite structure are depolymerized by impurity elements to release free tetrahedral structures, including the [AlO(4)] tetrahedron and [SiO(4)] tetrahedron. In the intervention of iron, the free tetrahedra, including [AlO(4)], [FeO(4)], and [SiO(4)] can bond with each other by sharing bridging oxygen (BO), probably forming Fe-O(BO)-Si, Fe-O(BO)-Al, and Al-O(BO)-Si in an Al(2)O(3)-SiO(2)-Fe(2)O(3)-Me(x)O(y) (Me = Ca, Mg, Ti, etc.)-based amorphous phase. These findings provide theoretical support for prolonging the service life of refractory materials in rotary kiln incinerators.
摘要：
The prolonged consumption of arsenic-contaminated water is linked to an elevated risk of cancer. As(III) in wastewater exhibits greater mobility, biotoxicity, and removal challenges than As(V). Acidic mine drainage (AMD) sludges are solid wastes produced by mining industry. In this study, a novel biochar modified with AMD sludge (AMDs@PB 2 ) was prepared via co-pyrolysis of AMD sludge and pine needles to remove As(III) from the solution. The effects of preparation conditions (pyrolysis temperature, raw material ratio) and environmental factors (solution pH, solution temperature, coexisting ions) of biochar on arsenic adsorption were investigated, and the arsenic adsorption performance of AMDs@PB 2 was analyzed by kinetic, isothermal and thermodynamic models. The results show that the optimal pyrolysis temperature for AMDs@PB 2 is 800 °C, and the mass ratio of AMD sludge to pine needles is 2:1. AMDs@PB 2 can effectively remove As(III) from water, thereby achieving the ‘treating waste with treated waste’ concept. The maximum theoretical adsorption capacity (Q e, the ) of AMDs@PB 2 for As(III) in wastewater is 83.35 mg g −1 , which is approximately 1.07–31.18 folds greater than Q e, the reported in previous studies. AMDs@PB 2 adsorption was slightly affected by anions (15–75 mg L −1 CI − , NO 3 − , SO 4 2− , PO 4 3− ) and humic acid and its removal rate ranged from 83.48 to 97.57 %. In addition, the AMDs@PB 2 adsorption process involves multilayer heterogeneous adsorption. As(III) adsorption by AMDs@PB 2 at 25 °C is thermo respiratory and spontaneous. The oxidation-reduction reaction, surface complexation, and coprecipitation dominated the immobilization of As(III) in the water environment by AMDs@PB 2 .
The prolonged consumption of arsenic-contaminated water is linked to an elevated risk of cancer. As(III) in wastewater exhibits greater mobility, biotoxicity, and removal challenges than As(V). Acidic mine drainage (AMD) sludges are solid wastes produced by mining industry. In this study, a novel biochar modified with AMD sludge (AMDs@PB 2 ) was prepared via co-pyrolysis of AMD sludge and pine needles to remove As(III) from the solution. The effects of preparation conditions (pyrolysis temperature, raw material ratio) and environmental factors (solution pH, solution temperature, coexisting ions) of biochar on arsenic adsorption were investigated, and the arsenic adsorption performance of AMDs@PB 2 was analyzed by kinetic, isothermal and thermodynamic models. The results show that the optimal pyrolysis temperature for AMDs@PB 2 is 800 °C, and the mass ratio of AMD sludge to pine needles is 2:1. AMDs@PB 2 can effectively remove As(III) from water, thereby achieving the ‘treating waste with treated waste’ concept. The maximum theoretical adsorption capacity (Q e, the ) of AMDs@PB 2 for As(III) in wastewater is 83.35 mg g −1 , which is approximately 1.07–31.18 folds greater than Q e, the reported in previous studies. AMDs@PB 2 adsorption was slightly affected by anions (15–75 mg L −1 CI − , NO 3 − , SO 4 2− , PO 4 3− ) and humic acid and its removal rate ranged from 83.48 to 97.57 %. In addition, the AMDs@PB 2 adsorption process involves multilayer heterogeneous adsorption. As(III) adsorption by AMDs@PB 2 at 25 °C is thermo respiratory and spontaneous. The oxidation-reduction reaction, surface complexation, and coprecipitation dominated the immobilization of As(III) in the water environment by AMDs@PB 2 .
摘要：
Antimicrobial resistance is a global health security issue of widespread concern. Recent studies have unveiled the potential contribution of non-antibiotics to the emergence of antimicrobial resistance. This study investigated the effect of carbamazepine, a non-antibiotic pharmaceutical, on the fate of antibiotic resistance genes (ARGs) during anaerobic digestion. The results, as revealed by both metagenomic sequencing and absolute quantification, demonstrated that carbamazepine induced the enrichment of ARGs and increased the abundance of ARGs hosts by 1.2-2.1 times. Carbamazepine facilitated microbial aggregation and intercellular communication by upregulating functional genes associated with two-component systems, quorum sensing and type IV secretion systems, thereby increasing the frequency of ARGs conjugation. Furthermore, carbamazepine induced the acquisition of ARGs by pathogens and elevated the overall pathogenic abundance. This study revealed the mechanisms of microbial self-regulation and ARGs transmission under carbamazepine stress, highlighting the potential health risks posed by non-antibiotic pharmaceuticals during the safe disposal of sludge.
摘要：
Predicting dust pollution is necessary to achieve good air quality and patient recovery. In the era of big data, there are already many machine learning algorithms for predicting the concentration of air pollutant PM2.5. However, these model methods perform poorly when dealing with massive air quality data sets and do not solve the impact of data distribution imbalance. Therefore, a multi-strategy collaborative feature selection method combining random forests and recursive feature elimination with adaptive boosting rotation forest (RFR-ABROF) algorithm is proposed. On this basis, multi-class adaptive synthetic sampling (Multi-ADASYN) strategy is introduced to balance the imbalanced air quality data set. We verified the effectiveness of the model through comparative experiments, which show our proposed model has the higher values of accuracy, precision, recall, f1-score, and ROC curve area under evaluation indicators in the air quality data set of four locations in most cases, and the more considerable the amount of data, the better the model prediction performance.
期刊：
Science of The Total Environment,2024年922:171245 ISSN：0048-9697
通讯作者：
Zeng, Peng;Zhou, H
作者机构：
[Liao, Bohan; Zhou, Hang; Zeng, Peng; Liao, Ye; Liu, Jiawei; Gu, Jiaofeng; Ni, Li; Zeng, P] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Liao, Bohan; Zeng, Peng; Gu, Jiaofeng; Zhou, Hang] Hunan Engn & Technol Res Ctr Soil Pollut Remediat, Changsha 410004, Peoples R China.;[Wang, Yun] Hunan Univ Arts & Sci, Coll Life & Environm Sci, Changde 415000, Peoples R China.;[Li, Qian; Gu, Jiaofeng] Hunan Res Inst Nonferrous Met Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Zhou, H ; Zeng, P] C;Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.
关键词：
Cd and As pollution soil;Compound passivator coupled with foliar spraying and soil applying Si fertilizer;Health risk evaluation;Rice
摘要：
Cadmium (Cd) and arsenic (As) are precedence-controlled contaminants in paddy soils, that can easily accumulate in rice grains. Limestone and sepiolite (LS) compound passivator can obviously reduce Cd uptake in rice, whereas Si fertilizer can effectively decrease rice As uptake. Here, the synergistic effects of the LS compound passivator coupled with Si fertilizer (LSCS) on the soil pH and availability of Si, Cd, and As, as well as rice grain Cd and As accumulation and its health risk were studied based on a 3-year consecutive field experiment. The results showed that the LSCS performed the best in terms of synchronously decreasing soil Cd and As availability and rice Cd and As uptake. In the LSCS treatments, soil pH gradually decreased with the rice-planting season, while soil available Cd and As contents gradually increased, suggesting that the influence of LSCS on Cd and As availability gradually weakened with rice cultivation. Nonetheless, the contents of Cd and inorganic As (i-As) in rice grains treated with LSCS were slightly affected by cultivation but were significantly lower than the single treatments of LS compound passivator or Si fertilizer. According to the Cd and As limit standards in food (GB2762-2022), the Cd and i-As content in rice grains can be lowered below the standard by using the 4500kg/hm(2) LS compound passivator coupled with 90kg/hm(2) Si fertilizer in soil and spraying 0.4g/L Si fertilizer on rice leaves for at least three years. Furthermore, health risk evaluation revealed that LSCS treatments significantly reduced the estimated daily intake, annual excess lifetime cancer risk, and hazard quotient of Cd and i-As in rice grains. These findings suggest that LSCS could be a viable approach for reducing Cd and As accumulation in rice grains and lowering the potential health risks associated with rice.
摘要：
Bacteria colonized on solid electrode developing electroactive biofilm (EAB) has been shown to promote the contaminants biodegradation. Regulating electrode potential can improve the stability of extracellular electron transfer (EET), but how the electrode potential regulating the extracellular polymer secretion and the tetracycline (TC) removal has not been fully studied. Here, EAB cultured at 0 V was used to study the degradation mechanism of TC at different electrode potentials. Results showed that −0.1 V was the optimized electrode potential for TC biodegradation compared with 0.1 V, 0 V and −0.3 V, which was 28 % higher than that without electric field. Stimulation of electric field can retain proper extracellular polymer (EPS) to relieve the poison of TC, while excessive extracellular polysaccharide (PS) at 0 V have hindered the contact between microorganisms and TC, thus limited electron transfer and reduced the TC biodegradation efficiency. Excessively negative potential (−0.3 V) will restrict the electron transfer which was not conducive to the biodegradation of organic pollutants. Microbial community analysis revealed that TC addition have refreshed the EAB structure, Dokdonella and Norank_f_Rikenellaceae replaced Geobacter as the dominant species in EAB to promote TC biodegradation. The variation of metabolic pathway was suggested that the up-regulation of pyruvate metabolism and ubiquinone synthesis at −0.1 V have promoted the TC removal. This study has provided theoretical support for the electrode potential regulating the extracellular polymer secretion and promoting the pollution bioremediation.
关键词：
Municipal waste;Processed organic waste;Waste disposal;Carbon sequestration;Agriculture
摘要：
Agricultural utilization of processed municipal organic waste (AUPMOW) offers a method of recycling organic waste to enhance crop productivity, maintain soil health, and increase carbon storage in plants. By effectively implementing AUPMOW, it can significantly contribute to a circular economy by managing waste and reducing greenhouse gas emissions. This review examines existing research on carbon mitigation through AUPMOW to guide future decisions on its implementation. It explores the mechanisms of carbon flow in agriculture and the characteristics of processed municipal organic waste (PMOW). Additionally, environmental, managerial, and systemic factors affecting AUPMOW efficacy are analyzed. Furthermore, it discusses the impact of policies and regulations on AUPMOW implementation. Some recommendations are made for optimizing current AUPMOW practices, including strengthening regulatory frameworks, managing soil contamination risks, reducing CH4 and N2O emissions during storage, considering long-term environmental impacts, selecting suitable locations, and employing minimally invasive farming methods. This review demonstrates how PMOW can improve soil carbon sequestration and offers a sustainable agricultural solution. It provides an overview of current research on the carbon mitigation potential of AUPMOW, recommends best management practices (BMPs) for future implementations, and identifies key insights for policymakers, emphasizing reduced reliance on chemical fertilizers and highlighting areas for future research.
作者机构：
[Li, Zhi; Zhu, Mingshan; Zhou, Daixi] Jinan Univ, Sch Environm, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 511443, Peoples R China.;[Hu, Xinjiang] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Chen, Li] Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Dept Gen Practice, Beijing 100853, Peoples R China.
通讯机构：
[Chen, L ] C;[Zhu, MS ] J;Jinan Univ, Sch Environm, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 511443, Peoples R China.;Chinese Peoples Liberat Army Gen Hosp, Med Ctr 1, Dept Gen Practice, Beijing 100853, Peoples R China.
关键词：
advanced oxidation process;persulfate;reactive oxygen species;single atom catalysts;substance
摘要：
In this review, SACs with different metal species and substrates are summarized to investigate the metal−support interaction effects on the persulfate oxidation reaction for water treatments. Abstract With maximum utilization of active metal sites, more and more researchers have reported using single atom catalysts (SACs) to activate persulfate (PS) for organic pollutants removal. In SACs, single metal atoms (Fe, Co, Cu, Mn, etc.) and different substrates (porous carbon, biochar, graphene oxide, carbon nitride, MOF, MoS2, and others) are the basic structural. Metal single atoms, substances, and connected chemical bonds all have a great influence on the electronic structures that directly affect the activation process of PS and degradation efficiency to organic pollutants. However, there are few relevant reviews about the interaction between metal single atoms and substances during PS activation process. In this review, the SACs with different metal species and substrates are summarized to investigate the metal−support interaction and evaluate their effects on PS oxidation reaction process. Furthermore, how metal atoms and substrates affect the reactive species and degradation pathways are also discussed. Finally, the challenges and prospects of SACs in PS‐AOPs are proposed.
作者机构：
[Xiao, Lu; Cheng, Hao; Wen, Wu] Beijing Normal Univ, Instrumentat & Serv Ctr Sci & Technol, Zhuhai 519087, Peoples R China.;[Xiao, Lu; Jiang, Xiaoman; Xia, Xinghui; Wen, Wu; Li, Siling; Xia, XH; Gao, Lijuan] Beijing Normal Univ, Sch Environm, Key Lab Water & Sediment Sci, Minist Educ,State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China.;[Gao, Lijuan] Beijing Normal Univ, Off Lab & Equipment Management, Zhuhai 519087, Peoples R China.;[Cheng, Hao] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Zhang, Shangwei; Zhang, SW] Beijing Normal Univ, Adv Interdisciplinary Inst Environm & Ecol, Zhuhai 519087, Peoples R China.
通讯机构：
[Zhang, SW ; Xia, XH ] B;Beijing Normal Univ, Sch Environm, Key Lab Water & Sediment Sci, Minist Educ,State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China.;Beijing Normal Univ, Adv Interdisciplinary Inst Environm & Ecol, Zhuhai 519087, Peoples R China.
关键词：
Perfluoroalkyl substances;Rainwater;Sediment;Spatiotemporal pattern;Surface water
摘要：
The source region of the Yellow River (SRYR) located in the northeast of the Qinghai-Tibetan Plateau is not only the largest runoff-producing area in the Yellow River Basin, but also the most important freshwater-supply ecological function area in China. In this study, the short-term spatiotemporal distribution of selected legacy and alternative perfluoroalkyl acids (PFAAs) in the SRYR was first investigated in multiple environmental media. Total PFAA concentrations were in the range of 1.16-14.3 ng/L, 4.25-42.1 pg/L, and 0.21-13.0 pg/g dw in rainwater, surface water, and sediment, respectively. C4-C7 PFAAs were predominant in various environmental matrices. Spatiotemporal characteristics were observed in the concentrations and composition profiles. Particularly, the spatial distribution of rainwater and the temporal distribution of surface water exhibited highly significant differences (p<0.01). Indian monsoon, westerly air masses, and local mountain-valley breeze were the driving factors that contributed to the change of rainwater. Rainwater, meltwater runoff, and precursor degradation were important sources of PFAA pollution in surface water. Organic carbon content was a major factor influencing PFAA distribution in sediment. These results provide a theoretical basis for revealing the regional transport and fate of PFAAs, and are also important prerequisites for effectively protecting the freshwater resource and aquatic environment of the Qinghai-Tibetan Plateau.
