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An insight on the mechanism of efficient leaching of vanadium from vanadium shale induced by microwave-generated hot spots

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 293-302页

作者： Sheng Li Yimin Zhang Yizhong Yuan Pengcheng Hu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Collaborative Innovation Center of Strategic Vanadium Resources Utilization Wuhan 430081China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan 430081China School of Resource and Environmental Engineering Wuhan University of TechnologyWuhan 430070China

Microwave heating can rapidly and uniformly raise the temperature and accelerate the reaction *** this paper,microwave heating was used to improve the acid leaching,and the mechanism was investigated via microscopic morphology analysis and numerical simulation by COMSOL Multiphysics *** effects of the microwave power,leaching temperature,CaF_(2) dosage,H_(2)SO_(4) concentration,and leaching time on the vanadium recovery were investigated.A vanadium recovery of 80.66%is obtained at a microwave power of 550 W,leaching temperature of 95℃,CaF_(2) dosage of 5wt%,H_(2)SO_(4) concentration of 20vol%,and leaching time of 2.5 *** with conventional leaching technology,the vanadium recovery increases by 6.18%,and the leaching time shortens by 79.17%.More obvious pulverization of shale particles and delamination of mica minerals happen in the microwave-assisted leaching *** simulation results show that the temperature of vanadium shales increases with an increase in electric field(E-field).The distributions of E-field and temperature among vanadium shale particles are relatively uniform,except for the higher content at the contact position of the *** analysis results of scaleup experiments and leaching experiments indicate high-temperature hot spots in the process of microwave-assisted leaching,and the local high temperature destroys the mineral structure and accelerates the reaction rate.

关键词： vanadium shale microwave-assisted leaching hot spots numerical simulation

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Modelling the thresholds of nitrogen/phosphorus concentration and hydraulic retention time for bloom control in reclaimed water landscape

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 53-63页

作者： keying Song Shufeng Zhu Yun Lu Guohua Dao Yinhu Wu Zhuo Chen Shengnan Wang Junhan Liu Wenguang Zhou Hong-Ying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China Beijing Laboratory for Environmental Frontier Technologies Beijing 100084China Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Educationand School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchang 330031China Research Institute for Environmental Innovation(Suzhou)Tsinghua JiangsuSuzhou 215163China

The risks posed by algal blooms caused by nitrogen and phosphorus in reclaimed water used in urban water landscapes need to be carefully *** this study,the combined effects of the nitrogen and phosphorus concentrations and the light intensity and temperature on the specific growth rates of algae were determined using Monod,Steele,and Arrhenius models,then an integrated algal growth model was *** algae biomass,nitrogen concentration,and phosphorus concentration mass balance equations were used to establish a new control model describing the nitrogen and phosphorus concentration and hydraulic retention time thresholds for algal *** model parameters were determined by fitting the models to data acquired ***,the control model and numerical simulations for six typical algae and mixed algae under standard conditions were used to determine nitrogen/phosphorus concentration and hydraulic retention time thresholds for landscape water to which reclaimed water is supplied(i.e.,for a reclaimed water landscape).

关键词： Reclaimed water landscape Algal bloom Nitrogen and phosphorus Hydraulic retention time Threshold control model

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Easily scale 3D conductive gradient fiber membrane for contaminants removal and fouling mitigation under electrochemical assistance

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Chemosphere 2024年 353卷 141358页

作者： Fei, Wen-Qing Guan, Jing Wan, Zhang-Hong Zhang, Chun-Miao Sun, Xue-Fei School of Environmental Science and Engineering Hefei University of Technology Hefei230009 China Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China

An electrochemical membrane filtration system provides an innovative approach to enhance contaminant removal and mitigate membrane fouling. There is an urgent need to develop portable, versatile, and efficient electrochemical membranes for affordable wastewater treatment. Here, a 3D conductive gradient fiber membrane (CC/PVDF) with a gradient porous structure was prepared using a two-step phase inversion method. Methyl orange (MO) was utilized as model organic substance to investigate the electrochemical performance of the CC/PVDF membrane. At applied potentials of +2 V, +3 V, −2 V and −3 V, the removal efficiency of MO was 5.1, 5.3, 4.8, and 5.1 times higher than at 0 V. A dramatic flux loss of 35.02% occurred on the membrane without electrochemistry, interestingly, whereas the flux losses were only 23.59%–10.24% in the applied potential after 30 min of filtration, which were approximately 1.18, 1.28, 1.29 and 1.38 times as high as that without electrochemistry, respectively. The enhanced removal and anti-fouling performances of the membranes were attributed to the functions of electrochemical degradation, electrostatic repulsion, and electrically enhanced wettability. Electrochemical generation of Hydrogen peroxide, along with HO• radicals, was detected and direct electron transfer and HO• were proved to be the dominant oxidants responsible for MO degradation. The intermediate oxidation products were identified by mass spectrometry, and an electrochemical degradation pathway of MO was proposed based on bond-breaking oxidation, ring-opening reactions, and complete oxidation. All the findings emphasize that the ECMF system possesses superior efficiency and creative potential for water purification applications. © 2024 Elsevier Ltd

关键词： Membranes

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Boosted visible-light-induced photo-Fenton degradation of organic pollutants over a novel direct Z-scheme NH2-MIL-125(Ti)@FeOCl heterojunction catalyst

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Chemosphere 2024年 365卷 143347页

作者： Zelekew, Osman Ahmed Haitosa, Haileyesus Hatano He, Lina Ma, Hui Cai, Junyi Wang, Ziqi Wu, Yi-nan College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse Tongji University 1239 Siping Rd. Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security 1239 Siping Rd. Shanghai200092 China Department of Materials Science and Engineering Adama Science and Technology University Adama Ethiopia

Improving the charge separation, charge transfer, and effective utilization is crucial in a photocatalysis system. Herein, we prepared a novel direct Z-scheme NH2-MIL-125(Ti)@FeOCl (Ti-MOF@FeOCl) composite photocatalyst through a simple method. The prepared composite catalyst was utilized in the photo-Fenton degradation of Rhodamine B (RhB) and ciprofloxacin (CIP). The Ti-MOF@FeOCl (10FeTi-MOF) catalyst exhibited the highest catalytic performance and degraded 99.1 and 66% of RhB and CIP, respectively. However, the pure NH2-MIL-125(Ti) (Ti-MOF) and FeOCl catalysts achieved only 50 and 92% of RhB and 50 and 37% of CIP, respectively. The higher catalytic activities of the Ti-MOF@FeOCl composite catalyst could be due to the electronic structure improvements, photoinduced charge separations, and charge transfer abilities in the catalyst system. The composite catalysts have also enhanced adsorption and visible light-responsive properties, allowing for efficient degradation. Furthermore, the electron paramagnetic resonance (EPR) signals, the reactive species trapping experiments, and Mott-Schottky (M − S) measurements revealed that the photogenerated superoxide radical (•O2−), hydroxyl radical (•OH), and holes (h+) played a vital role in the degradation process. The results also demonstrated that the Ti-MOF@FeOCl heterojunction composite catalysts could be a promising photo-Fenton catalyst system for the environmental remediation. Environmental implications The discharging of toxic contaminants such as organic dyes, antibiotics, and other emerging pollutants to the environment deteriorates the ecosystem. Specifically, the residues of organic pollutants recognized as a threat to ecosystem and a cause for carcinogenic effects. Among them, ciprofloxacin is one of antibiotics which has biological resistance, and metabolize partially in the human or animal bodies. It is also difficult to degrade ciprofloxacin completely with traditional treatment methods. Similarly, organic dye

关键词： Electron spin resonance spectroscopy

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电纺高熵氧化物纳米纤维用于乙酸乙酯的催化氧化:揭示金属-氧键的协同作用（英文）

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Science China Materials 2025年

作者：王馨林逸典陈银烨左佳昌王秀云罗永晋 Digital Fujian Internet-of-Things Laboratory of Environmental Monitoring Fujian Key Laboratory of Pollution Control & Resource Reuse College of Environmental and Resource Science Fujian Normal University Qingyuan Innovation Laboratory National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University

乙酸乙酯（EA）是一种稳定的含氧挥发性有机化合物,由于其强烈的化学键,难以降解.高熵金属氧化物（HEO）因活跃的晶格氧和不同的金属-氧键在有效降解EA方面具有巨大潜力.在这项研究中,我们开发了一种静电纺丝方法来合成尖晶石型HEO,在26...

乙酸乙酯（EA）是一种稳定的含氧挥发性有机化合物,由于其强烈的化学键,难以降解.高熵金属氧化物（HEO）因活跃的晶格氧和不同的金属-氧键在有效降解EA方面具有巨大潜力.在这项研究中,我们开发了一种静电纺丝方法来合成尖晶石型HEO,在266°C下实现了90%的E A转化率, C O2选择性为1 0 0%. 1 mmol HEO催化剂显示出101.5±0.8 h-1的高周转率,并在五次循环和热稳定性测试中表现出优异的稳定性.一项18O同位素标记的实验证实EA的氧化遵循Mars-van Krevelen机制,高晶格氧迁移率显著提高了催化活性.此外,原位漫反射红外傅里叶变换光谱为不同金属-氧键在催化机制中的作用提供了见解.这项工作加深了对含氧挥发性有机物氧化过程中金属-氧键相互作用的理解,并为合成HEO提供了一种可行的方法.

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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

SSRN

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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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Rare Earth-Doped Ni/MgAl2O4 Catalysts Prepared Via a One-Step Sol–Gel Method for Steam Reforming of Volatile Organic Solvents at Low Temperature

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SSRN 2023年

作者： Lin, Feng Ma, Xiangwei Chen, Zezhi Gong, Huijuan Xu, Mingze State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China Center of Material Analysis Nanjing University Nanjing210023 China

The volatile organic solvents recovered from pharmaceutical and chemical industries are often incinerated as waste, which poses a serious threat to the environment. An innovative and cost-effective alternative involves transforming the recovered solvents into gas fuel (H2, CO, CH4) for electricity generation through catalytic steam reforming. However, there are still no literature reports on catalysts highly efficient in reforming organic solvents of different structures. In this study, Ni/MgAl2O4 catalysts modified with La, Ce or Pr rare earths were synthesized using a novel one-step sol–gel method. Among these catalysts, the Ni-La/MgAl2O4 exhibited exceptional low-temperature performance, achieving a conversion efficiency of 97.3 % at 550 oC for the recovered solvent (the mixture of toluene, acetone, tetrahydrofuran, n-hexane). The outstanding performance of Ni-La/MgAl2O4 catalyst arises from the structural compatibility between low-spin La atom and Ni cluster, which enables La to modify Ni dispersion and electronic structure more significantly than Ce or Pr. © 2023, The Authors. All rights reserved.

关键词： Temperature

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Simultaneous Elimination of Sulfamethoxazole, Antibiotic-Resistant Bacteria and Resistance Genes by Mgfe2O4/Mgo Modified Biochar Activated Peroxymonosulfate: Performance, Mechanism and Application Potential

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SSRN 2024年

作者： Wang, Xuejiang Wang, Guanlu Sun, Zhenhua Liu, Yiyang Chen, Xi Yan, Changchun State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security College of Environmental Science and Engineering Tongji University Shanghai200092 China Laboratory of Solid Waste Environmental Risk Control Guangdong Provincial Academy of Environmental Science Guangzhou510045 China Shanghai Academy of Environmental Sciences Shanghai200233 China

The extensive utilization of antibiotics has resulted in an escalation of antibiotic resistance (AR), which represent a significant threat to human health. In this study, a MgFe2O4/MgO modified biochar (MMFBC) activated peroxymonosulfate oxidation system (MMFBC/PMS) was constructed to eliminate sulfamethoxazole (SMX), antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) simultaneously. Experimental results demonstrated that the oxidation system was capable of fully inactivating E. coli DH5α within 30 min, and the horizontal gene transfer (HGT) frequency of sulfonamides ARG (sul1) was decreased to the lowest level within just 2 min ([MMFBC] = 0.4 g/L, [PMS] = 1.0 mM, initial E. coli DH5α concentration: ~ 108 CFU/mL). Meanwhile, the MMFBC/PMS could achieve synchronous removal of SMX within 30 min ([SMX] = 20 mg/L). Singlet oxygen (1O2) was the primary reactive oxygen species for the disinfection process. From the perspective of time evolution, the mechanism underlying simultaneous elimination of ARB and ARGs were analyzed. It was found that proteins were preferentially damaged, and the leakage of cellular contents due to membrane impairment played an important role in the initial decrease of HGT frequency. Furtherly, the system was implemented for treatment of actual livestock wastewater to assess its application potential. The metagenomic analysis revealed that MMFBC/PMS treatment effectively achieved sterilization, and led to a significant reduction in the relative abundance of HGT-related functional genes and ARGs. Overall, this work provided a practical approach to control AR and new insights for improvement of disinfection efficiency. © 2024, The Authors. All rights reserved.

关键词： Escherichia coli

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Acceleration of Start-Up of Moving Bed Biofilm Reactor at Low Temperature by Adding Specialized Quorum Sensing Bacteria

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SSRN 2022年

作者： Fu, Hui-Min Wang, Jinfeng Ren, Hongqiang Ding, Lili State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

This study aims to accelerate biofilm formation and operational performance of moving bed biofilm reactor (MBBR) at 5 ℃ by adding specialized Quorum Sensing bacteria (sphingomonas rubra BH3T). Results showed that bio augmented MBBR (RS) achieved a higher COD and NH4+-N removal rate (93% and 75%), which in accordance with its increased biofilm thickness, higher biofilm activity, and nitrifying bacteria abundance (Nitrospira). The increased biofilm thickness during the whole operating time, accompanied by more potent adhesion force, was related to increased polysaccharides and proteins in the biofilm. Pyrosequencing analysis indicated that BH3T contributed to higher species richness and triggered the rapid growth of precursor microorganisms (Nakamurella, Micropruina, and Zoogloea) and the enrichment of multifunctional microorganisms (Pseudomonas, Aeromonas, Arcobacter, Dechloromonas, and Flavobacterium) at low temperatures. This study provides an economical and practical new insight into accelerating start-up of MBBR system at low temperature. © 2022, The Authors. All rights reserved.

关键词： Temperature

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Insights into the Role of Vocs Properties on Desorption Behaviors of Two Porous Polymeric Resins

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SSRN 2023年

作者： Liu, Huijuan Yu, Yansong Yang, Zemin Liu, Zhimin Long, Chao School of Eco-Environment Hebei University Baoding071002 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Desorption is a critical process in the recovery or post-treatment of adsorbents saturated with volatile organic compounds (VOCs). In this study, the thermal desorption behaviors for eight VOCs on hypercrosslinked polymeric resin (HPR) and macroporous polymeric resin (MPR) were investigated through isothermal desorption and temperature programmed desorption (TPD). Compared with MPR, HPR with more micropores exhibited a lower desorption rate constant, lower desorption efficiency and higher desorption activation energy due to the strong binding energy generated between VOCs molecules and narrow micropores. As the polarizability of VOCs increased, the desorption rate constants on two porous polymeric resins decreased, while the desorption activation energy showed an incremental trend. Excellent linear correlations were observed between VOC polarizability and desorption rate constants (R2=0.957 for HPR and R2=0.940 for MPR) as well as between VOC polarizability and desorption activation energy (R2=0.981 for HPR and R2=0.969 for MPR). Furthermore, a polyparameter linear free energy relationship (PP-LFER) was developed to explore the influences of intermolecular interactions on desorption behaviors of VOCs on porous polymeric resins. The results indicated that the dispersive interaction, which is directly related to polarizability of VOCs, was the primary factor influencing the desorption activation energy of VOCs on porous polymeric resins. The find from this study helps evaluate fleetly and availably the desorption properties of VOCs based on their polarizability. © 2023, The Authors. All rights reserved.

关键词： Volatile organic compounds

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