Adsorption and photocatalytic decomposition of roxarsone by TiO2 and its mechanism

文献类型： 外文期刊

第一作者： Lu, Donglei

作者： Lu, Donglei;Wang, Wei;Yuan, Shoujun;Hu, Zhen-Hu;Ji, Feng;Wang, Wei;Yuan, Shoujun;Hu, Zhen-Hu;Chen, Tianhu

作者机构：

关键词： Adsorption;Decomposition pathway;Photocatalysis;Roxarsone;TiO2

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2014 年 21 卷 13 期

页码：

收录情况： SCI

摘要： Roxarsone (3-nitro-4-hydroxyphenylarsonic acid) has been widely used as organic arsenic additive in animal industry. In this study, the adsorption of roxarsone on TiO2 under dark conditions, the photocatalytic decomposition of roxarsone under UV/TiO2, and the possible photocatalytic pathway were investigated. At the initial concentration of 5-35 mg/L, the adsorption of roxarsone fitted well with the pseudo-second-order kinetics. The isotherms analysis showed that the Langmuir model was better than the Freundlich and Dubinin-Radushkevich models for describing the adsorption process. After 7 h of photocatalytic decomposition, a complete disappearance of roxarsone was achieved. The pH value has a significant effect on both adsorption and photocatalytic decomposition of roxarsone. The results of high-performance liquid chromatography-hydride generation-atomic fluorescence spectrometry (HPLC-HG-AFS) and gas chromatography-mass spectrometry (GC/MS) analyses proved the cleavage of the As-C bond during the photocatalytic decomposition process by TiO2 and the intermediates of the decomposition. Based on the results, a possible photocatalytic decomposition pathway was proposed.

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