Dimethoate degradation by VUV/UV process: Kinetics, mechanism and economic feasibility
文献类型：期刊论文
| 作者 | Wu, Zhengdi; Yang, Laxiang; Tang, Yubin; Qiang, Zhimin; Li, Mengkai
|
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2021-06 |
| 卷号 | 273页码:- |
| 关键词 | Dimethoate degradation VUV/UV Economic assessment Water treatment |
| ISSN号 | 0045-6535 |
| 英文摘要 | Vacuum ultraviolet/ultraviolet (VUV/UV) process has been applied to water treatment recently, but little is known about its efficacy and mechanism for pesticide degradation. This study investigated the degradation kinetics and mechanism of a typical organophosphorus pesticide, dimethoate (DMT) by VUV/UV, and then the economic feasibility was assessed. DMT degradation followed well the pseudofirst-order reaction kinetics at an initial concentration of <= 5.0 mg L-1. DMT was degraded by 97.8% after 10 min of VUV/UV exposure (VUV fluence = 12 mJ cm(-2)), whereas by only 5.2% after 10 min of UV exposure (UV fluence = 156 mJ cm(-2)). The apparent quantum yield of DMT degradation by VUV/UV was determined to be 0.19, and at most 50.7% of hydroxyl radicals (HO center dot) generated from VUV photolysis of water could be utilized for DMT degradation. As the pH increased from 5.0 to 9.0, the DMT degradation rate decreased from 0.43 to 0.23 min(-1). DMT degradation pathways in the VUV/UV process were proposed based on identified organic intermediates and inorganic ions. SO42- was first released due to HO center dot attack on the S=P bond of DMT, which governed the DMT degradation efficiency; while the release of PO43- was pertinent to the DMT mineralization efficiency. DMT solution toxicity was significantly reduced after VUV/UV treatment. An electrical energy-per-order (E-EO) value of 0.57 kWh m(-3) Order(-1) demonstrated the economic feasibility of the VUV/UV process for DMT removal in small-scale drinking water treatment. (C) 2021 Published by Elsevier Ltd. |
| WOS研究方向 | Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46193]  |
| 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 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, 18 Shuang Qing Rd, Beijing 100085, Peoples R China 2.Jiangsu Univ Sci & Technol, Sch Environm & Chem Engn, Zhenjiang 212003, Jiangsu, Peoples R China 3.Shaoyang Univ, Sch Food & Chem Engn, 28 Lane 3,Shaoshui West Rd, Shaoyang 422900, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Zhengdi,Yang, Laxiang,Tang, Yubin,et al. Dimethoate degradation by VUV/UV process: Kinetics, mechanism and economic feasibility[J]. CHEMOSPHERE,2021,273:-. |
| APA | Wu, Zhengdi,Yang, Laxiang,Tang, Yubin,Qiang, Zhimin,&Li, Mengkai.(2021).Dimethoate degradation by VUV/UV process: Kinetics, mechanism and economic feasibility.CHEMOSPHERE,273,-. |
| MLA | Wu, Zhengdi,et al."Dimethoate degradation by VUV/UV process: Kinetics, mechanism and economic feasibility".CHEMOSPHERE 273(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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