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A comparative study on in-situ synthesis of two iron nanoparticles in acid mine drainage using green tea and Excoecaria cochinchinensis leaves extracts

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Chemosphere 2025年 381卷 144488页

作者： Cao, Zhiwei Pan, Zibin Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse College of Environmental and Resource Sciences College of Carbon Neutral Modern Industry Fujian Normal University Fujian Province Fuzhou350007 China School of Chemistry and Environment Yunnan Minzu University Yunnan Kunming650504 China

Acid mine drainage (AMD) is a type of wastewater characterized by elevated concentrations of heavy metals and metalloids, posing significant threats to ecosystems and human health. This study presents an eco-friendly method for in-situ synthesis of iron nanoparticles (FeNPs) in AMD using Excoecaria cochinchinensis leaves (EC) and green tea extracts (GT) as reducing/stabilizing agents, enabling simultaneous removal of heavy metals and metalloids. Results indicate that the two FeNPs (EC-FeNPs and GT-FeNPs) produced in AMD exhibited distinct structural and reactive properties. Firstly, the removal efficiencies of EC-FeNPs for As, Ni and Cd were 20.4 %, 15.31 %, and 11.62 %, respectively, while those of GT-FeNPs were 10.07 %, 11.7 % and 19.76 %, respectively. This indicates that EC-FeNPs were generally more effective than GT-FeNPs in removing heavy metals and metalloids from AMD. Secondly, EC-FeNPs (170.14 ± 3.22 nm) displayed larger particle sizes and more stable surface charges compared to GT-FeNPs (127.14 ± 1.94 nm), which could be attributed to differences in functional groups in the respective plant extracts. Thirdly, both EC and GT extracts acted as reductants and stabilizers in the synthesis of two FeNPs, with EC extracts providing a larger amount of phenolic compounds and carboxylic acids than GT extracts. Highlighted in this study is a novel approach for resource recovery and simultaneous removal of heavy metals and metalloids from AMD. © 2025 Elsevier Ltd

关键词： Environmental management systems

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What are the different biomolecules involved in the selective recovery of REEs from mining wastewater using FeNPs synthesized from two plant extracts?

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Science of the Total Environment 2024年 947卷 174571页

作者： Xu, Xinmiao Zhang, Zhenjun Weng, Xiulan Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350117 China Environmental Contaminants Group Future Industries Institute University of South Australian Mawson LakesSA5095 Australia

Extracting rare earth elements (REEs) from wastewater is crucial for saving the environment, sustainable use of natural resources and economic growth. Reported here is a simple, low cost and one-step synthesis of Fe nanoparticles (FeNPs) based on two plant extracts having the ability to recover REEs. The synthesis of FeNPs using Excoecaria cochinchinensis leaves extract (Ec-FeNPs) exhibited high selectivity for heavy rare earth due to unique biomolecules, achieving separation coefficients (Kd) of 3.16 × 103–4.04 × 106 mL/g and recovery efficiencies ranging from 71.7 to 100 %. Conversely, the synthesis of FeNPs using Pinus massoniana lamb extract (PML-FeNPs) revealed poorer REE recovery efficiencies of 7.2–86.7 %. To understand the differences between Ec-FeNPs and PML-FeNPs in terms of selectivity and efficiency, LC-QTOF-MS served to analyze the biomolecules differences of two plant extracts. In addition, various types of characterization were carried out to identify the different functional groups encapsulated on the surface of FeNPs. These results reveal the source of the difference in the selectivity of Ec-FeNPs and PML-FeNPs for REEs. Furthermore, during DFT calculations, it was found that biomolecules with varying affinities for the surface of FeNPs interact with each other, leading to the formation of structures that exhibit high reactivity towards REEs. Finally, incorporating Spearman correlation analysis demonstrates that the selective removal efficiency of REEs was closely linked to surface complexation, ion exchange, and electrostatic adsorption. Consequently, this work strongly highlights the potential for the practical application of novel adsorbents in this field. © 2024 Elsevier B.V.

关键词： Biomolecules

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Enhancing Cadmium Uptake in Rice Grains Through Chloride Intervention: Field-Based Investigations and Perspectives

SSRN

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SSRN 2024年

作者： Guo, Jingxia Ge, Chenghao Abulimiti, Madinai Hu, Cong Wang, Guo Zhou, Dongmei State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China College of Resource and Environmental Science Soil Environmental Health and Regulation Key Laboratory of Fujian Province Fujian Agriculture and Forestry University Fuzhou350002 China

Cadmium (Cd) contamination in rice ecosystems poses substantial threats to global food security and ecological integrity. This study examines the effect of chloride (Cl-) addition on the dynamics of Cd in soil and rice plants. Our findings indicated that Cl- addition markedly decreased soil pH, increased Eh, and facilitated the formation of Cl-Cd complexes, resulting in enhancing the solubility, mobility, and bioavailability of Cd. Furthermore, Cl- addition also led to considerable reductions in DTPA-extractable iron (Fe) and manganese (Mn), which indirectly boosted Cd uptake by rice roots, ranging from 17.4% to 65.0%, through the upregulation of transport genes OsNramp1 and OsNramp5, and decreased iron plaque formation by 23.1% to 27.2%. Additionally, Cl- stimulated Cd transport form roots to shoots by upregulating the OsHMA2 gene, enhancing Cd accumulation in rice tissues and facilitating its translocation across plant compartments, ultimately resulting in elevated Cd levels in brown rice (41.3%~76.1%). Field trials have substantiated that Cl- application significantly enhanced Cd absorption in rice plants cultivated in slightly acid and Cd-contaminated soils, implying introducing Cl- exacerbates the risk of Cd accumulation in rice grains. Consequently, to safeguard food safety and protect ecological health, the use of Cl-containing materials in agricultural practices should be avoided. © 2024, The Authors. All rights reserved.

关键词： Biochemistry

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Rationally designed ultrathin Ni(OH)_(2)/titanate nanosheet heterostructure for photocatalytic CO_(2) reduction

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Green Chemical Engineering 2022年第3期3卷 240-249页

作者： Wanru Liao Suwei Lu Weihang Chen Shuying Zhu Yuzhou Xia Min-Quan Yang Shijing Liang College of Environmental Science and Engineering Fujian Key Laboratory of Pollution Control&Resource ReuseFujian Normal UniversityFuzhou350007China College of Chemistry Fuzhou UniversityFuzhou350108China Province University Key Laboratory of Green Energy and Environment Catalysis Ningde Normal UniversityNingde352100China National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou350002China

Dye-sensitized photocatalysis has been extensively studied for photocatalytic solar energy conversion due to the advantage in capturing long-wavelength photons with a high absorption *** rational integration of photosensitizer with semiconductor and cocatalyst to collaboratively operate in one system is highly ***,we fabricate a Ni(OH)_(2)-loaded titanate nanosheet(Ni(OH)_(2)/H_(2)Ti_(6)O_(13))composite for high-performance dye-sensitized photocatalytic CO_(2) *** ultrathin H_(2)Ti_(6)O_(13) nanosheets with negative surface charge provide an excellent support to anchor the dye photosensitizer,while the loaded Ni(OH)2 serves as an adsorbent of CO_(2) and electron sink of *** such,the photoelectrons derived from the[Ru(bpy)3]Cl_(2) sensitizer can be targeted transfer to the Ni(OH)_(2) active sites via the H_(2) Ti_(6)O_(13) nanosheets linker.A high CO production rate of 1801μmol g^(-1) h^(-1) is obtained over the optimal Ni(OH)_(2)/H_(2)Ti_(6)O_(13),while the pure H_(2)Ti_(6)O_(13) shows significantly lower CO_(2) reduction *** work is anticipated to trigger more research attention on the rational design and synthesis of earth-abundant transition metal-based cocatalysts decorated on ultrathin 2D platforms for artificially photocatalytic CO_(2) reduction.

关键词： Titanate nanosheet Ni(OH)_(2) Photosensitizer CO_(2)reduction

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Unveiling a novel mechanism: Reduction of graphene oxide by Lysinibacillus sp. through secretion of L-ascorbic acid

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Chemosphere 2024年 369卷 143813页

作者： Zhou, Yuanyuan Lin, Ziyi Han, Yonghe Gan, Li Cheng, Ying Chen, Zuliang Fujian Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China Global Centre for Environmental Remediation College of Engineering Science and Environment University of Newcastle CallaghanNSW2308 Australia

The graphene oxide (GO) reduction by microorganisms has garnered considerable interest, yet the specific mechanisms underlying the bacteria secretion of reducing substances for GO reduction remain unclear. This study aims to learn that bacterial extracellular components can reduce graphene oxide through direct (contacting GO) and indirect (not contacting GO) reduction experiments. The subsequent investigation focused on identifying the specific substances secreted by bacteria capable of GO reduction. The results of non-targeted metabolomics revealed differential expression of cacid (L-AA) demonstrates a significant up-regulation. The further experiment involved the supplementation of L-AA in the reduction system of Lysinibacillus sp. with GO, demonstrating enhanced reduction efficacy, with the ID/IG ratio of reduced graphene oxide (rGO) increasing to 1.073 after 4 d of reduction with 0.5 g L−1 L-AA. Therefore, the mediation of GO reduction by L-AA secreted by Lysinibacillus sp. is proposed as a viable mechanism, offering novel insights into microbial GO reduction. © 2024 Elsevier Ltd

关键词： Reduced Graphene Oxide

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Environmental behavior of microplastic - heavy metal synergistic contamination in a typical urban-rural river network

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Emerging Contaminants 2025年第3期11卷

作者： Zhang, Kaihang Huang, Jian Zhang, Jiamei Zhang, Hua Xi, Shanshan School of Environmental and Energy Engineering Anhui Jianzhu University Hefei 230601 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Hefei 230601 China Pollution Control and Resource Utilization in Industrial Parks Joint Laboratory of Anhui Province Hefei 230601 China

Microplastics (MPs) and heavy metals (HMs) in rivers pose a global threat to human health and the ecological environment. Given the differences in pollutant classes, the co-occurrence and interactions between MPs and HMs are still poorly understood. In this study, the co-occurrence of MPs and HMs across different seasons were investigated in the urban-rural rivers of a typical inland city, China. MPs and HMs were detected in all water samples at the wet and dry seasons, and the differences in the abundance of MPs and HMs between the two water periods were not significant. The abundance of MPs was higher in urban and industrial zones than that in agricultural zones. The predominant form and composition of MPs was granules (44.49 %) and polyethylene terephthalate (PET, 85.40 %), with the most common color being transparent (48.99 %). HMs (Mn, Cu, Cr, Zn, Cd, Pb) were detected in MPs, with the strongest adsorption capacity observed for Mn (K_pw = 4.90). Based on the correlation analysis and structural equation model, the polymer type of MPs (path coefficient = 0.3798) and the content of HMs in water (path coefficient = 0.3391) were the significant influence drivers on the adsorption of HMs by MPs. The Hazard Index revealed a medium risk of MPs in the urban-rural rivers, while the pollution Load Index indicated a low risk of the river water body. These findings suggest that synergistic pollution from MPs and HMs may increase the ecological risk in river water, and the results provide important data for understanding the characteristics of the urban-rural rivers. © 2025 The Authors

关键词： Heavy metal Influence drivers Microplastic Synergistic-contamination Urban-rural rivers

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Synergistic PM_(2.5)and O_(3)control to address the emerging global PM_(2.5)-O_(3)compound pollution challenges

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Eco-Environment & Health 2024年第3期3卷 325-337页

作者： Chao He Jianhua Liu Yiqi Zhou Jingwei Zhou Lu Zhang Yifei Wang Lu Liu Sha Peng College of Resources and Environment Yangtze UniversityWuhan 430100China Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze UniversityWuhan 430100China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China Hydrology and Environmental Hydraulics Group Wageningen University and ResearchWageningen 6700 HBthe Netherlands State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China State Key Joint Laboratory for Environmental Simulation and Pollution Control School of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Pollution Control and Resource Reuse School of EnvironmentNanjing UniversityNanjing 210023China Collaborative Innovation Center for Emissions Trading System Co-constructed by the Province and Ministry Hubei University of EconomicsWuhan 430205China

In recent years,the issue of PM_(2.5)-O_(3)compound pollution has become a significant global environmental *** study examines the spatial and temporal patterns of global PM_(2.5)-O_(3)compound pollution and exposure risks,firstly at the global and urban scale,using spatial statistical regression,exposure risk assessment,and trend analyses based on the datasets of daily PM_(2.5)and surface O_(3)concentrations monitored in 120 cities around the world from 2019 to ***,on the basis of the common emission sources,spatial heterogeneity,interacting chemical mechanisms,and synergistic exposure risk levels between PM_(2.5)and O_(3)pollution,we proposed a synergistic PM_(2.5)-O_(3)control framework for the joint control of PM_(2.5)and *** results indicated that:(1)Nearly 50%of cities worldwide were affected by PM_(2.5)-O_(3)compound pollution,with China,South Korea,Japan,and India being the global hotspots for PM2.5-O3 compound pollution;(2)Cities with PM_(2.5)-O_(3)compound pollution have exposure risk levels dominated by ST t ST(Stabilization)and ST t HR(High Risk).Exposure risk levels of compound pollution in developing countries are significantly higher than those in developed countries,with unequal exposure characteristics;(3)The selected cities showed significant positive spatial correlations between PM_(2.5)and O_(3)concentrations,which were consistent with the spatial distribution of the precursors NOx and VOCs;(4)During the study period,52.5%of cities worldwide achieved synergistic reductions in annual average PM_(2.5)and O_(3)*** average PM_(2.5)concentration in these cities decreased by 13.97%,while the average O_(3)concentration decreased by 19.18%.This new solution offers the opportunity to construct intelligent and healthy cities in the upcoming low–carbon transition.

关键词： PM_(2.5)-O_(3)compound pollution Population exposure risk Spatial correlation Synergistic treatment potential

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Formation of disinfection by-products during sodium hypochlorite cleaning of fouled membranes from membrane bioreactors

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 271-281页

作者： Hao Wang Defang Ma Weiye Shi Zhiyu Yang Yun Cai Baoyu Gao Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao266237China No.1 Institute of Geology and Mineral Resources of Shandong Province Jinan250014China Shandong Engineering Laboratory for High-Grade Fe Ores Exploration and Exploitation Jinan250014China

Periodic chemical cleaning with sodium hypochlorite(NaClO)is essential to restore the membrane permeability in a membrane bioreactor(MBR).However,the chlorination of membrane foulants results in the formation of disinfection by-products(DBPs),which will cause the deterioration of the MBR effluent and increase the antibiotic resistance in bacteria in the MBR *** this study,the formation of 14 DBPs during chemical cleaning offouled MBR membrane modules was *** with the effects of biofilm extracellular polymeric substances(EPS),influences of reaction time,NaClO dosage,initial pH,and cleaning temperature on the DBP formation were *** acids(HAAs)and trichloromethane(TCM),composed over 90%of the DBPs,were increasingly accumulated as the NaClO cleaning time *** increasing the chlorine dosage,temperature,and pH,the yield of TCM and dichloroacetic acid(DCAA)was increased by up to a factor of 1–14,whereas the yields of haloacetonitriles(HANs)and haloketones(HKs)were *** decreasing in the chlorine dosage and cleaning temperature or adjusting the pH of cleaning reagents toward acidic or alkaline could effectively reduce the toxic risks caused by *** the EPS extraction pretreatment,the formation of DBPs was accelerated in the first 12 h due to the damage of biofilm *** laser scanning microscopy(CLSM)images showed that EPS,particularly polysaccharides,were highly resistant to chlorine and might be able to protect the cells exposed to chlorination.

关键词： MBR Biofouling EPS Chemical cleaning DBPs CLSM

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Spatiotemporal Distribution and Ecological Risk of Azole Fungicides During the Urban Water Cycle in the Lower Reaches of the Yangtze River, China

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SSRN 2023年

作者： Zhang, Yangyang Gu, Xinjie Li, Xiuwen Zhao, Qiuyun Hu, Xiaodong Huang, Rui Xu, Jixiong Yin, Zilong Zhou, Qing Shi, Peng Li, Aimin State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Jiangsu Province Hydraulic Research Institute Nanjing210023 China

Azole fungicides (AFs) play a vital role in preventing and treating fungal diseases in agricultural crops. However, there have been limited studies focusing on the fate and ecological risk of AFs in the urban water cycle at a large watershed scale. To address this gap, we investigated the spatiotemporal distribution and ecological risk of twenty AFs in the lower reaches of the Yangtze River across four seasons. Our findings revealed that all AFs were detected in surface water except for triazophos (TAP) and mepanipyrim (MAP). Among the detected AFs, carbendazim (CBA), tebuconazole (TBA), tricyclazole (TCA), and propiconazole (PPA) emerged as the dominant compounds. Their highest concentrations were recorded in January (188.0 ng/L), and November (2197.0 ng/L), July (162.0 ng/L), and November (1802.0 ng/L), respectively. The comparison between effluents from wastewater treatment plants (WWTPs) and surface water pointed towards industrial WWTPs as a major source of AFs in the Yangtze River. Specifically, TBA and PPA were found to be the most recalcitrant AFs in industrial WWTPs, while DFA in municipal WWTPs, with an average removal rate of below 60%. The ecological risk assessment demonstrated that the average risk quotient (RQ) for total AFs in the fall was 6.45, higher than that in January (0.98), April (0.61), and July (0.40). This indicates that AFs in surface water during dry seasons posed higher environmental risks. Additionally, the exposure risk of AFs through drinking water to sensitive populations deserves more attention. This study provides benchmark data on the occurrence of AFs in the lower reaches of the Yangtze River, and offers suggestions for better reduction of AFs. © 2023, The Authors. All rights reserved.

关键词： Risk assessment

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U(VI) removal by zerovalent manganese modified corn straw biochar in acidic wastewater: Efficiency, characteristics and mechanism

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Chemosphere 2025年 373卷 144163页

作者： Zeng, Taotao Fu, Yusong Yang, Min Deng, Qiqi Chen, Shengbin Liu, Yingjiu Li, Jun Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology University of South China Hunan Hengyang421001 China Shenzheng518055 China Hunan Vch Environment Technology Co. Ltd Changsha410014 China College of Environment and Ecology Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University Chongqing400045 China

The chemical and radiological toxicity of uranium can present a significant risk to both human health and environmental safety. Thus, ZVMn-BC was synthesized through borohydride reduction aimed at investigating its performance in removing U(VI) in acidic environment (pH = 3). Several batch experiments were conducted to assess the sorption capability under various operational conditions and the relevant experimental data were investigated by kinetics, isotherms and thermodynamic equations. ZVMn-BC exhibited excellent resistance to interference and showed a superiority on U(VI) removal over zerovalent manganese (ZVMn) and corn straw biochar (BC). Under condition of pH 3, and ambient temperature of 303 K with 0.4 g/L of adsorbent, ZVMn-BC exhibited a theoretical sorption quantity of 274.78 mg/g. The sorption process was spontaneous and endothermic, primarily relying on chemical adsorption. The interaction mechanism involved electrostatic interaction, hydrolysis precipitation, complexation, and redox reactions. This study verified that ZVMn-BC exhibits effective performance for U(VI) eliminating in acidic wastewater. © 2025 Elsevier Ltd

关键词： Uranium compounds

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