Simulated solar light driven roxarsone degradation and arsenic immobilization with hematite and oxalate
作者： Na Chen , Yichao Wan , Guangming Zhan , Xiaobing Wang , Meiqi Li
DOI: 10.1016/J.CEJ.2019.123254
关键词: Environmental remediation 、 Arsenic 、 Photocatalysis 、 Chemistry 、 Inorganic chemistry 、 Hematite 、 Roxarsone 、 Oxalate 、 Adsorption 、 Oxygen
摘要: Abstract Solar light driven organoarsenicals degradation and simultaneous inorganic arsenic immobilization with naturally abundant hematite is very promising for remediation, but suffers from the fast electron-hole charge recombination of hematite. Herein, we report that oxalate, widely existed in soil water environments, can greatly enhance photocatalytic molecular oxygen activation to degrade a typical organoarsenical roxarsone immobilize resulted arsenic. It was found oxalate could chelate surface Fe(III) generate plenty •OH via Fe(III)/Fe(II) cycle mediated process under simulated solar light, thus induced 85.1% transformation into species, mainly As(V), within 6 h. The generated As(V) be further adsorbed on prolonging reaction time 24 h dark, avoiding secondary pollution. More importantly, reusable presence oxalate. This study offers green effective strategy also sheds environmental effects iron oxides
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