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Preparation of Ag-MnFe204-bentonite Magnetic Composite for Pb（II）/Cd（II） Adsorption Removal and bacterial inactivation in Wastewater

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Chemical Research in Chinese Universities 2018年第5期34卷 808-816页

作者： LI Qin ZHAO Yongsheng QU Dan WANG Haoying CHEN Jin ZHOU Rui Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin Provincial Key Laboratory of Water Resource and EnvironmentCollege of New Energy and Environment Jilin University Changchun 130021 P. R. China Baohang Enrironment Company Limited Beijing 100107 R. R China

An Ag-MnFe2O4-bentonite composite was synthesized by a chemical co-precipitation method and used for adsorption removal of Pb（II）, Cd（II） and disinfection. The result of X-ray diffraction indicate that the diffraction peaks of MnFe2O4 and Ag can be perfectly indexed to the cubic spinel MnFe2O4（JCPDS No.88-1965） and metallic Ag（JCPDS No.41-1402）, respectively. The results of scanning electron microscopy and energy dispersive X-ray spectroscopy manifest the deposition of MnFe2O4 and Ag on the bentonite surface and the presence ofMn, Fe and Ag. The result of X-ray photoelectron spectroscopy displayed that the composition of Ag-MnFe2O4-bentonite was Mn（II）, Fe（III） and metallic Ag. The analysis of Brunauer-Emmett-Teller showed that the specific surface area of Ag-MnFe2O4-bentonite was the largest compared with that of bentonite, MnFe2O4 and MnFe2O4-bentonite. Thermo- dynamic studies revealed that the adsorption of Pb（II） and Cd（II） ions was spontaneous and endothermic. Langmuir model showed an adsorption capacity of 129.87 mg/g for Pb（II） and 48.31 mg/g for Cd（II） ions. The adsorption ki- netics of Pb（II） and Cd（II） ions onto Ag-MnFe2O4-bentonite can be best described by a pseudo-second-order model. The adsorption rate constant of the pseudo-second-order model was 0.0019 g·mg^-1·min^-1 for Pb（II） and 0.0065 g·mg^-1·min^-1 for Cd（II） ions. In addition to the adsorption experiment, the antibacterial properties of Ag-MnFe2O4-bentonite were studied through plate count method. Gram-negative（G-） bacteria Escherichia coli and Gram-positive（G＋） bacteria Lactobacillus plantarum were used to test the antibacterial properties. The results showed that the composite demonstrated excellent antibacterial activity. Thus, Ag-MnFe2O4-bentonite can be em- ployed as an adsorbent as well as an antimicrobial agent.

关键词： Ag-MnFe2O4-bentonite Adsorption Heavy metal ion bacterial inactivation Wastewater treatment

Effective E.coli inactivation of core-shell ZnO@ZIF-8 photocatalysis under visible light synergize with peroxymonosulfate:Efficiency and mechanism

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Chinese Chemical Letters 2022年第1期33卷 415-423页

作者： Yanni Jiang Zhaokun Xiong Jianbo Huang Feng Yan Gang Yao Bo Lai State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Sino-German Centre for Water and Health Research Sichuan UniversityChengdu 610065China Department of Ultrasound Laboratory of Ultrasound Imaging DrugWest China HospitalSichuan UniversityChengdu 610041China Institute of Environmental Engineering RWTH Aachen UniversityAachen 52072Germany

How to utilize inexhaustible solar light as a means of disinfection technology for its cheap and green remains a challenge.In this work,core-shell ZnO@ZIF-8 was synthesized and used for bacterial inactivation synergizing with peroxymonosulfate(PMS)under visible light irradiation.It took 50 min to achieve thorough sterilization for 7.5-log Escherichia coli(E.coli)cells in vis/PMS/ZnO@ZIF-8 system,compared with that 4.5-log reduction completed in vis/PMS/ZnO system under the same conditions.The enhanced photocatalytic disinfection mechanisms of fabricated ZnO@ZIF-8 were investigated by UV-vis diffuse reflectance spectra,electrochemical impedance spectra and Mott-Schottky plots.The promoted bactericidal efficiency was attributed to higher charge-separation efficiency and stronger oxidation ability of photo-generated holes.Moreover,it was found that^(1)O_(2)and·OH induced bacterial cell lesion process,and the former was the main active species.The external reactive oxygen species(ROS)caused a series of cell wall damage,intercellular ROS up-regulation and genome DNA unwinding,finally resulted in irreversible bacterial death.A two-route mechanism in vis/PMS/ZnO@ZIF-8 system was proposed,in which the generation of^(1)O_(2)was supposed as the product of the oxygen oxidation of photo-generated holes and PMS dissociation.Our work is expected to provide advanced information about a low-cost water disinfection technology of visible light photocatalysis.

关键词： bacterial inactivation Photocatalysis Visible light Peroxymonosulfate

Bacteria inactivation by sulfate radical:progress and non-negligible disinfection by-products

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 23-36页

作者： Xin Zhou Xiaoya Ren Yu Chen Haopeng Feng Jiangfang Yu Kang Peng Yuying Zhang Wenhao Chen Jing Tang Jiajia Wang Lin Tang College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Key Laboratory of Environmental Biology and Pollution Control(Hunan University) Ministry of EducationChangsha 410082China

Sulfate radicals have been increasingly used for the pathogen inactivation due to their strong redox ability and high selectivity for electron-rich species in the last decade.The application of sulfate radicals in water disinfection has become a very promising technology.However,there is currently a lack of reviews of sulfate radicals inactivated pathogenic microorganisms.At the same time,less attention has been paid to disinfection by-products produced by the use of sulfate radicals to inactivate microorganisms.This paper begins with a brief overview of sulfate radicals’properties.Then,the progress in water disinfection by sulfate radicals is summarized.The mechanism and inactivation kinetics of inactivating microorganisms are briefly described.After that,the disinfection by-products produced by reactions of sulfate radicals with chlorine,bromine,iodide ions and organic halogens in water are also discussed.In response to these possible challenges,this article concludes with some specific solutions and future research directions.

关键词： Sulfate radicals Disinfection by-products inactivation mechanisms bacterial inactivation Water disinfection

Surface diffuse discharge mechanism of well-aligned atmospheric pressure microplasma arrays

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Chinese Physics B 2016年第4期25卷 222-230页

作者：周仁武周儒森庄金星李江炜陈茂冬张先徽刘东平 Kostya (Ken) Ostrikov 杨思泽 Fujian Key Laboratory for Plasma and Magnetic Resonance School of Physics and Mechanical & Electrical Engineering Xiamen University Xiamen 361005 China Department of Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Xiamen Jueshi Language Training Center Xiamen 361005 China Liaoning Key Laboratory of Optoelectronic Films & Materials School of Physics and Materials Engineering Dalian Nationalities University Dalian 116600 China School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Brisbane Queensland 4000 Australia CSIRO Materials Science and Engineering P. O. Box 218 Lindfield NSW 2070 Australia

A stable and homogeneous well-aligned air microplasma device for application at atmospheric pressure is designed and its electrical and optical characteristics are investigated. Current-voltage measurements and intensified charge coupled device （ICCD） images show that the well-aligned air microplasma device is able to generate a large-area and homogeneous discharge at the applied voltages ranging from 12 kV to 14 kV, with a repetition frequency of 5 kHz, which is attributed to the diffusion effect of plasma on dielectric surface. Moreover, this well-aligned microplasma device may result in the uniform and large-area surface modification of heat-sensitive PET polymers without damage, such as optimization in hydrophobicity and biocompatibility. In the biomedical field, the utility of this well-aligned microplasma device is further testified. It proves to be very efficient for the large-area and uniform inactivation of E. coli cells with a density of 103/cm2 on LB agar plate culture medium, and inactivation efficiency can reach up to 99% for 2-min treatment.

关键词： surface diffusion intensified charge coupled device surface modification bacterial inactivation

Development of a battery-operated floating-electrode dielectric barrier discharge plasma device and its characteristics

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Plasma Science and Technology 2021年第6期23卷 67-73页

作者：刘亚韪王森周儒森方志欧思聪 College of Electrical Engineering and Control Science Nanjing Technology UniversityNanjing 211816People's Republic of China School of Chemistry and Physics and QUT Centre for Materials Science Queensland University of Technology(QUT)BrisbaneQueensland 4000Australia

In this work,a portable floating-electrode dielectric barrier discharge(FE-DBD)device is designed with a rechargeable battery as the power supply.The characteristics of the FE-DBD with a metal electrode and human hand are studied and compared.The human contact safety is verified by calculating the current through the human body based on the equivalent circuit model.Escherichia coli inactivation experiments confirm the efficacy of the FE-DBD device in the envisaged applications.

关键词： floating-electrode dielectric barrier discharge portable plasma source human contact safety bacterial inactivation

Characterization and Photocatalytic Efficiency of TiO_2 /Ti Beads Fabricated by Simple Heat-Treatment

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Journal of Materials Science & Technology 2012年第2期28卷 184-192页

作者： Altangerel Amarjargal Leonard D.Tijing Mi-Hwa Yu Chae-Hwa Kim Chan-Hee Park Dong-Won Kim Cheol-Sang Kim Department of Bionanosystem Engineering Chonbuk National University Power Engineering School Mongolian University of Science and Technology Division of Mechanical Design Engineering Chonbuk National University Department of Industrial and Information Systems Engineering Chonbuk National University

The goal of the present study was to investigate the photocatalytic efficiency of titanium dioxide （TiO2） formed on titanium （Ti） bead substrate （referred herein as TiO2/Ti beads） by heat treatment when exposing to ultraviolet （UV） light irradiation. Escherichia coli was used as the model test organism. The results show 4-log and 7-log decrease in bacterial concentration after a test time of 15 and 120 min, respectively, using TiO2/Ti beads irradiated with UV light in a tin-foil covered beaker. This article presents the potential of TiO2 on Ti bead substrate formed by simple heat-treatment together with UV light for bacterial inactivation.

关键词： Photocatalysis Titanium dioxide bacterial inactivation Heat treatment Escherichia coli