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Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process
Lan, Huachun; Li, Jianfei; Sun, Meng; An, Xiaoqiang; Hu, Chengzhi; Liu, Ruiping; Liu, Huijuan; Qu, Jiuhui
2016-09-01
Source PublicationWATER RESEARCH
Volume100Issue:0Pages:57-64
AbstractIn this study, a FeCx/N-doped carbon fiber composite (FeCx/NCNFs) was developed via an electrospinning method. According to the characterization results of XRD, TEM and XPS, FeCx. (a mixture of Fe7C3 and Fe3C) was either embedded in or attached to the NCNFs. It was used for the first time as a catalyst for dimethylarsinate (DMA) degradation and as an absorbent for inorganic arsenic (As (V)), with degradation and adsorption occurring simultaneously, in an electro-Fenton process. The effects of catalyst dosage, initial DMA concentration, solution pH, and applied current on the treatment efficiency and the corresponding H2O2 generation were systematically investigated. The results showed that DMA could be efficiently oxidized into As(V). 96% of DMA was degraded after reaction time of 360 min and the residual As(V) concentration in solution was below the allowable limit of 0.01 mg/L under the optimum treatment conditions. Based on an ESR and radical scavenger experiment, .OH was proven to be the sole reactive oxygen species involved in the degradation process of DMA. DMA was oxidized to MMA as the primary oxidation product, which was subsequently oxidized to inorganic arsenic, As (V). TOC was also efficiently removed at the same time. The DMA removal mechanism for simultaneous degradation of dimethylarsinate and adsorption of arsenic over FeCx/NCNFs in the electro-Fenton process was also proposed based on the experimental results. (C) 2016 Published by Elsevier Ltd.
Department中国科学院饮用水科学与技术重点实验室
KeywordFec(X/)Ncnfs Dimethylarsinate Degradation Adsorption Electro-fenton
DOI10.1016/j.watres.2016.05.018
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/36173
Collection中国科学院饮用水科学与技术重点实验室
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GB/T 7714
Lan, Huachun,Li, Jianfei,Sun, Meng,et al. Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process[J]. WATER RESEARCH,2016,100(0):57-64.
APA Lan, Huachun.,Li, Jianfei.,Sun, Meng.,An, Xiaoqiang.,Hu, Chengzhi.,...&Qu, Jiuhui.(2016).Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process.WATER RESEARCH,100(0),57-64.
MLA Lan, Huachun,et al."Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process".WATER RESEARCH 100.0(2016):57-64.
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