Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2
文献类型：期刊论文
| 作者 | Dong, Jingjing; Hu, Chengzhi; Qi, Weixiao ; An, Xiaoqiang; Liu, Huijuan; Qu, Jiuhui
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| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2020-05 |
| 卷号 | 91页码:35-42 |
| 关键词 | Mesoporous TiO2 Dimethylarsinic acid Adsorption Photocatalysis Oxygen vacancy |
| ISSN号 | 1001-0742 |
| 英文摘要 | Much attention has been paid to the pollutant dimethylarsenic acid (DMA), because of its high toxicity even at very low doses. Although TiO2 photocatalytic oxidation ( PCO) is one of the few effective methods for treating DMA-containing water, the efficient decomposition of DMA and simultaneous removal of toxic arsenic species remains a significant but challenging task. Here, defective mesoporous TiO2 with mixed-phase structure was synthesized and used as both photocatalyst and adsorbent for DMA removal. Due to the reduced band-gap and enhanced separation of photogenerated charge carriers, the oxygen-deficient TiO2 nanostructures exhibited 4.2 times higher PCO efficiency than commercial TiO2 (P25). More importantly, the high surface area of the mesoporous TiO2 provided sufficient active sites for in-situ adsorption and reaction, resulting in the efficient removal of as-formed As(V). Combining the experimental and characterization results, the different roles of reactive species during PCO reactions were clarified. In the presence of hole (hthorn) as the dominant oxidation species, DMA was demethylated and transformed into MMA. Thereafter, MMA was subsequently reduced to As(III) by photo-generated electrons. Superoxide radicals (O-2(center dot-)) played a significant role in oxidizing As(III) into As(V), which was finally adsorptively removed by the mesoporous TiO2. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45263]  |
| 专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
| 推荐引用方式 GB/T 7714 | Dong, Jingjing,Hu, Chengzhi,Qi, Weixiao,et al. Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,91:35-42. |
| APA | Dong, Jingjing,Hu, Chengzhi,Qi, Weixiao,An, Xiaoqiang,Liu, Huijuan,&Qu, Jiuhui.(2020).Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2.JOURNAL OF ENVIRONMENTAL SCIENCES,91,35-42. |
| MLA | Dong, Jingjing,et al."Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2".JOURNAL OF ENVIRONMENTAL SCIENCES 91(2020):35-42. |
入库方式： OAI收割
来源：生态环境研究中心
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