| Efficacy of in situ active capping Cd highly contaminated sediments with nano-Fe(2)O(3 )modified biochar | |
Liu, Qunqun1,2; Sheng, Yanqing1 ; Liu, Xiaozhu1,2
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| 发表期刊 | ENVIRONMENTAL POLLUTION
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| ISSN | 0269-7491 |
| 2021-12-01 | |
| 卷号 | 290页码:11 |
| 关键词 | Sediment Cadmium (Cd) Active in situ capping Biochar |
| DOI | 10.1016/j.envpol.2021.118134 |
| 通讯作者 | Sheng, Yanqing([email protected]) |
| 英文摘要 | Effective remediation of Cd polluted sediment is imperative for its potential damages to aquatic ecosystem. Biochar (BC) and nano-Fe2O3 modified BC (nFe2O3@BC) were conducted to remedy Cd highly contaminated sediments, and their performances, applicable conditions, and mechanisms were investigated. After 60 d capping, both BC and nFe2O3@BC capping inhibited Cd release from sediment to overlying water and porewater (reduction rates >99%). The released Cd concentrations in overlying water with nFe2O3@BC capping decreased by 1.6-11.0 times compared to those of BC capping, indicating nFe2O3@BC presented a higher capping efficiency. Notably, the increases of acidity and disturbance intensity of overlying water weakened the capping efficiencies of nFe2O3@BC and BC. BC capping was inappropriate in acidic and neutral waters (pH 3, 5, and 7) because Cd maintained a continuous release after 15 d, while nFe2O3@BC capping was valid in all pH treatments. Under 150 rpm stirring treatment, Cd release rates with BC and nFe2O3@BC capping decreased after 15 d and 30 d, respectively. At 0 and 100 rpm treatments, Cd releases treated by nFe2O3@BC capping finally kept a balance, indicating nFe2O3@BC was valid at low disturbance intensity. BC and nFe2O3@BC capping inhibited Cd release via weakening the influences of pH and disturbance on sediment. However, capping layers should be further processed because most adsorbed Cd in capping layers (>98%) would be re-released into overlying water. Meanwhile, excessive application of nFe2O3@BC could increase the risk of Fe release. The results provide novel insights into the potential applications of nFe2O3@BC and BC in situ capping of Cd polluted sediments in field remediation. |
| 资助机构 | Key Project of Shandong Provincial Natural Science Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Technology Research and Development Program of Shandong Province |
| 收录类别 | SCI |
| 语种 | 英语 |
| 关键词[WOS] | CRYSTALLINE IRON-OXIDES ; METAL RELEASE ; HEAVY-METALS ; WATER ; IMMOBILIZATION ; ADSORPTION ; REMOVAL ; PB ; RESUSPENSION ; ENHANCEMENT |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| WOS记录号 | WOS:000696802800001 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/29774 |
| 专题 | 中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境工程技术研究与发展中心 中国科学院海岸带环境过程与生态修复重点实验室 |
| 通讯作者 | Sheng, Yanqing |
| 作者单位 | 1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Res Ctr Coastal Environm Engn Technol Shandong Pr, Yantai, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Qunqun,Sheng, Yanqing,Liu, Xiaozhu. Efficacy of in situ active capping Cd highly contaminated sediments with nano-Fe(2)O(3 )modified biochar[J]. ENVIRONMENTAL POLLUTION,2021,290:11. |
| APA | Liu, Qunqun,Sheng, Yanqing,&Liu, Xiaozhu.(2021).Efficacy of in situ active capping Cd highly contaminated sediments with nano-Fe(2)O(3 )modified biochar.ENVIRONMENTAL POLLUTION,290,11. |
| MLA | Liu, Qunqun,et al."Efficacy of in situ active capping Cd highly contaminated sediments with nano-Fe(2)O(3 )modified biochar".ENVIRONMENTAL POLLUTION 290(2021):11. |
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