Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism

查看全文 作　　者：Xiaoguang [1,2,3]Li;Ying [2,3]Zhao;Beidou [2,3,4]Xi;Xiaoguang [5]Meng;Bin [2,3]Gong;Rui [2,3]Li;Xing [1,2,3]Peng;Hongliang [1,2,3]Liu

机构地区：[1]School of Environment,Beijing Normal University,Beijing 100875,China;[2]State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;[3]State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;[4]School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;[5]Center for Environmental Systems,Stevens Institute of Technology,Hoboken,NJ 07030,USA

出　　处：《Journal of Environmental Sciences》索引2017年第29卷第2期,共10页

基　　金：support provided by the National Key Technology R&D Program(no.2012BAJ21B04);the financial support from the China Scholarship Council(CSC)for one year as a visiting scholar at Stevens Institute of Technology 摘　　要：In this study, a novel nanoscale zero-valent iron(n ZVI) composite material was successfully synthesized using a low-cost natural clay, 'Hangjin 2#clay'(HJ clay) as the support and tested for the decolorization of the azo dye Methyl Orange(MO) in aqueous solution by n ZVI particles. According to the characterization and MO decolorization experiments, the sample with 5:1 HJ clay-supported n ZVI(HJ/n ZVI) mass ratio(HJ-n ZVI5) showed the best dispersion and reactivity and the highest MO decolorization efficiency. With the same equivalent Fe0 dosage, the HJ-n ZVI1 and HJ-n ZVI5 samples demonstrated a synergetic effect for the decolorization of MO: their decolorization efficiencies were much higher than that achieved by physical mixing of HJ clay and n ZVIs, or the sum of HJ clay and n ZVIs alone. The synergetic effect was primarily due to the improved dispersion and more effective utilization of the n ZVI particles on/in the composite materials. Higher decolorization efficiency of MO was obtained at larger HJ-n ZVI dosage, higher temperature and under N2 atmosphere, while the MO initial concentration and p H were negatively correlated to the efficiency. HJ clay not only works as a carrier for n ZVI nanoparticles, but also contributes to the decolorization through an 'adsorption-enhanced reduction' mechanism. The high efficiency of HJ-n ZVI for decontamination gives it great potential for use in a variety of remediation applications. 关键词：铁纳米粒子天然粘土脱色实验协同效应还原机理甲基橙零价铁效率优化

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Decolorization of Methyl Orange by a new clay-supported nanoscale zero-valent iron:Synergetic effect,efficiency optimization and mechanism

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