Microplastic residues in wetland ecosystems: Do they truly threaten the plant-microbe-soil system?
文献类型：期刊论文
| 作者 | Yu, Hongwei; Qi, Weixiao ; Cao, Xiaofeng; Hu, Jingwen; Li, Yang; Peng, Jianfeng; Hu, Chengzhi; Qu, Jiuhui
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| 刊名 | ENVIRONMENT INTERNATIONAL
 |
| 出版日期 | 2021 |
| 卷号 | 325页码:- |
| 关键词 | Arsenic Sustainable catalyst Advanced oxidation Pollutant adsorption Lewis acid-base adduct |
| ISSN号 | 0959-6526 |
| 英文摘要 | Arsenic (As) is a toxic contaminant in surface waters and groundwater. Oxidation of arsenite (As(III)) to less toxic arsenate (As(V)) by hydrogen peroxide (H2O2) is desirable for enhancing the immobilisation of Arsenic (As). However, this As(III) oxidation process is constrained by the strong pH dependence and the generated As(V) must also be removed for complete As remediation. This study developed and evaluated a novel heterogeneous catalytic system using manganese-doped Lanthanum oxycarbonate (MnL) to catalyse the oxidation of As(III) by H2O2 and simultaneously adsorb the generated As(V). The presence of MnL enhanced the removal rate of As(III) by 35 times compared with systems utilising H2O2 alone. Additionally, this superior performance was observed over a wide pH range (5-9), which demonstrated this approach could bypass the well-known pH restriction on oxidation by H2O2. Mechanistic studies revealed that the long-lived superoxide radicals (.O2- /.OOH), present on the particle surfaces and derived from the dissociation of the Lewis acid-base adduct (La-OOH*), were the dominant active species for As(III) oxidation. Mn atoms with low valence states played a crucial role in As(III) oxidation through the provision of extra active sites to facilitate radical production. The La and Mn sites in MnL could rapidly immobilize the generated As(V) by forming precipitates, resulting in a final As removal efficiency of 99% even after three cycles of reutilisation. Overall, this study demonstrates the viability of the proposed novel multi-functional catalyst for efficient As remediation from aqueous environments. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/46916]  |
| 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.Wuhan Univ, Coll Life Sci, Natl Field Stn Freshwater Ecosystem Liangzi Lake, Dept Ecol, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Key Lab Drinking Water Sci & Technol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 3.Tsinghua Univ, Ctr Water & Ecol, State Key Joint Lab Environm Simulat & Pollut Con, Sch Environm, Beijing 100084, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Hongwei,Qi, Weixiao,Cao, Xiaofeng,et al. Microplastic residues in wetland ecosystems: Do they truly threaten the plant-microbe-soil system?[J]. ENVIRONMENT INTERNATIONAL,2021,325:-. |
| APA | Yu, Hongwei.,Qi, Weixiao.,Cao, Xiaofeng.,Hu, Jingwen.,Li, Yang.,...&Qu, Jiuhui.(2021).Microplastic residues in wetland ecosystems: Do they truly threaten the plant-microbe-soil system?.ENVIRONMENT INTERNATIONAL,325,-. |
| MLA | Yu, Hongwei,et al."Microplastic residues in wetland ecosystems: Do they truly threaten the plant-microbe-soil system?".ENVIRONMENT INTERNATIONAL 325(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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