Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2  

作　　者：Jingjing Dong Chengzhi Hu Weixiao Qi Xiaoqiang An Huijuan Liu Jiuhui Qu 

机构地区：[1]Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Environmental Sciences》2020年第5期35-42,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51678556 and 51578531);the National Key Research&Development Program of China(No.2016YFC0400806)

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(h+)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(O2·-)played a significant role in oxidizing As(Ⅲ)into As(Ⅴ),which was finally adsorptively removed by the mesoporous TiO2.

关 键 词：Mesoporous TiO2 Dimethylarsinic acid ADSORPTION PHOTOCATALYSIS Oxygen vacancy 

分 类 号：TU991.2[建筑科学—市政工程]