Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron
文献类型：期刊论文
| 作者 | Du, Jingjing ; Lu, Jinsuo ; Wu, Qiong ; Jing, Chuanyong |
| 刊名 | Engineering; Environmental Sciences & Ecology
 |
| 出版日期 | 2012 |
| 卷号 | 215期号:1页码:152-158 |
| 关键词 | Chromite ore processing residue (COPR) Nanoscale zero-valent iron (nZVI) X-ray absorption near edge structure (XANES) spectroscopy Chromate leachability Speciation |
| ISSN号 | 0304-3894 |
| 中文摘要 | Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr(VI) leaching. To reduce Cr(VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero-valent iron (nZVI) and the Cr(VI) speciation and leachability were studied. Multiple complementary analysis methods including leaching tests, X-ray powder diffraction. X-ray absorption near edge structure (XANES) spectroscopy, and X-ray photoelectron spectroscopy (XPS) were employed to investigate the immobilization mechanism. Geochemical PHREEQC model calculation agreed well with our acid neutralizing capacity experimental results and confirmed that when pH was lowered from 11.7 to 7.0, leachate Cr(VI) concentrations were in the range 358-445 mg L-1 which contributed over 90% of dissolved Cr from COPR. Results of alkaline digestion, XANES, and XPS demonstrated that incubation COPR with nZVI under water content higher than 27% could result in a nearly complete Cr(VI) reduction in solids and less than 0.1 mg L-1 Cr(VI) in the TCLP leachate. The results indicated that remediation approaches using nZVI to reduce Cr(VI) in COPR should be successful with sufficient water content to facilitate electron transfer from nZVI to COPR. (C) 2012 Elsevier B.V. All rights reserved. |
| WOS记录号 | WOS:000303306400019 |
| 公开日期 | 2014-11-27 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/8076]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Du, Jingjing,Lu, Jinsuo,Wu, Qiong,et al. Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron[J]. Engineering; Environmental Sciences & Ecology,2012,215(1):152-158. |
| APA | Du, Jingjing,Lu, Jinsuo,Wu, Qiong,&Jing, Chuanyong.(2012).Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron.Engineering; Environmental Sciences & Ecology,215(1),152-158. |
| MLA | Du, Jingjing,et al."Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero-valent iron".Engineering; Environmental Sciences & Ecology 215.1(2012):152-158. |
入库方式： OAI收割
来源：生态环境研究中心
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