| Reductive Removal and Recovery of As(V) and As(III) from Strongly Acidic Wastewater by a UV/Formic Acid Process | |
Kong, Linghao ; Zhao, Jinmin; Hu, Xingyun; Zhu, Feng; Peng, Xianjia
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| 2022-06 | |
| Source Publication | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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| ISSN | 0013-936X |
| Issue | 0Pages:1-12 |
| Abstract | The removal of arsenic (As(V) and As(III)) from strongly acidic wastewater using traditional neutralization or sulfuration precipitation methods produces a large amount of arsenic-containing hazardous wastes, which poses a potential threat to the environment. In this study, an ultraviolet/formic acid (UV/HCOOH) process was proposed to reductively remove and recover arsenic from strongly acidic wastewater in the form of valuable elemental arsenic (As(0)) products to avoid the generation of hazardous wastes. We found that more than 99% of As(V) and As(III) in wastewater was reduced to highly pure solid As(0) (>99.5 wt %) by HCOOH under UV irradiation. As(V) can be efficiently reduced to As(IV) (H2AsO3 or H4AsO4) by hydrogen radicals (H-center dot) generated from the photolysis of HCOOH through dehydroxylation or hydrogenation. Then, As(IV) is reduced to As(III) by H-center dot or through its disproportionation. The reduction of As(V) to H4AsO4 by H-center dot and the disproportionation of H4AsO4 are the main reaction processes. Subsequently, As(III) is reduced to As(0) not only by H-center dot through stepwise dehydroxylation but also through the disproportionation of intermediate arsenic species As(II) and As(I). With additional density functional theory calculations, this study provides a theoretical foundation for the reductive removal of arsenic from acidic wastewater. |
| Department | 环境水质学国家重点实验室 ; 环境水质学国家重点实验室 |
| Keyword | AQUEOUS FORMIC ACID HCO QUANTUM YIELDS RATE CONSTANTS LASER PHOTOLYSIS ANION-RADICALS DEGRADATION UV ULTRAVIOLET KINETICS FORMATE |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47721 |
| Collection | 环境水质学国家重点实验室 |
| Corresponding Author | Peng, Xianjia |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Beijing Key Lab Ind Wastewater Treatment & Resour, Beijing 100085, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Kong, Linghao,Zhao, Jinmin,Hu, Xingyun,et al. Reductive Removal and Recovery of As(V) and As(III) from Strongly Acidic Wastewater by a UV/Formic Acid Process[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022(0):1-12. |
| APA | Kong, Linghao,Zhao, Jinmin,Hu, Xingyun,Zhu, Feng,&Peng, Xianjia.(2022).Reductive Removal and Recovery of As(V) and As(III) from Strongly Acidic Wastewater by a UV/Formic Acid Process.ENVIRONMENTAL SCIENCE & TECHNOLOGY(0),1-12. |
| MLA | Kong, Linghao,et al."Reductive Removal and Recovery of As(V) and As(III) from Strongly Acidic Wastewater by a UV/Formic Acid Process".ENVIRONMENTAL SCIENCE & TECHNOLOGY .0(2022):1-12. |
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| Reductive Removal an（3456KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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