Mechanisms of UV-Light Promoted Removal of As(V) by Sulfide from Strongly Acidic Wastewater

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	Mechanisms of UV-Light Promoted Removal of As(V) by Sulfide from Strongly Acidic Wastewater
	Hu, Xingyun; Kong, Linghao; Peng, Xianjia
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2017-11-07
卷号	51 期号:21 页码:12583-12591
英文摘要	Strongly acidic wastewater with a high arsenic concentration is produced by a number of industries. The removal of As(V) (H3AsO4) by sulfide from strongly acidic wastewater remains a difficult issue. This study proposed a UV-assisted method to efficiently remove As(V) by sulfide, and, the involved mechanisms were systematically investigated. In the dark, the low removal efficiency of As(V) by sulfide was attributed to the slow formation and transformation of an intermediate species, i.e., monothioarsenate (H3AsO3S), in the As(V) sulfuration reaction, which were the rate-controlling steps in this process. However, UV irradiation significantly promoted the removal efficiency of As(V) not only by promoting the formation of H3AsO3S through light induced HS center dot and center dot H radicals but also by enhancing the transformation of H3AsO3S through a charge-transfer process between S (-II) and As(V) in the H3AsO3S complex, leading to the reduction of As(V) to As(III) and the oxidation of S (-II) to S(0). The formed As(III) species immediately precipitated as As2S3 under excess S(-II). Kinetic modeling offered a quantitative explanation of the results and verified the proposed mechanisms. This study provides a theoretical foundation for the application of light promoted As(V) sulfuration removal, which may facilitate the recycling and reuse of arsenic and acid in strongly acidic wastewater.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39523]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Hu, Xingyun,Kong, Linghao,Peng, Xianjia. Mechanisms of UV-Light Promoted Removal of As(V) by Sulfide from Strongly Acidic Wastewater[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2017,51(21):12583-12591.
APA	Hu, Xingyun,Kong, Linghao,&Peng, Xianjia.(2017).Mechanisms of UV-Light Promoted Removal of As(V) by Sulfide from Strongly Acidic Wastewater.ENVIRONMENTAL SCIENCE & TECHNOLOGY,51(21),12583-12591.
MLA	Hu, Xingyun,et al."Mechanisms of UV-Light Promoted Removal of As(V) by Sulfide from Strongly Acidic Wastewater".ENVIRONMENTAL SCIENCE & TECHNOLOGY 51.21(2017):12583-12591.