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
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
2021-12-01
Volume290Pages:11
KeywordSediment Cadmium (Cd) Active in situ capping Biochar
DOI10.1016/j.envpol.2021.118134
Corresponding AuthorSheng, Yanqing(yqsheng@yic.ac.cn)
AbstractEffective 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.
Funding OrganizationKey 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
Indexed BySCI
Language英语
WOS KeywordCRYSTALLINE IRON-OXIDES ; METAL RELEASE ; HEAVY-METALS ; WATER ; IMMOBILIZATION ; ADSORPTION ; REMOVAL ; PB ; RESUSPENSION ; ENHANCEMENT
WOS Research AreaEnvironmental Sciences & Ecology
WOS IDWOS:000696802800001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.yic.ac.cn/handle/133337/29774
Collection中科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
中科院海岸带环境过程与生态修复重点实验室
Corresponding AuthorSheng, Yanqing
Affiliation1.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
Recommended Citation
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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