Effective extraction and recovery of rare earth elements (REEs) in contaminated soils using a reusable biosurfactant

doi:10.1016/j.chemosphere.2020.127070

GIEC OpenIR

	Effective extraction and recovery of rare earth elements (REEs) in contaminated soils using a reusable biosurfactant
	Li, Qiqi 1; Zhong, Huiqiong2 ; Cao, Yan 1,2,3,4
	2020-10-01
发表期刊	CHEMOSPHERE
ISSN	0045-6535
卷号	256 页码:10
通讯作者	Cao, Yan(caoyan@ms.giec.ac.cna)
摘要	Tea saponin (TS), a plant derived biosurfactant, was used to investigate on its effectiveness on the extraction of three typically selected rare earth elements (REEs, light lanthanum (La), medium arrowhead (Dy) and heavy erbium (Er)) from contaminated soils, in the presence of important toxic heavy metals (lead (Pb) and cadmium (Cd)). A complete procedure, involving the extraction of REEs in soils, the recovery of REEs and TS in the extraction leachates and the reuse of the recovered TS, was established. Experimental results showed that the optimal extraction parameters were consumption of 1.2 g/g (TS/soil), pH of 5 and the extraction time of 24 h. The recovery efficiencies of La, Dy, Er, Cd and Pb achieved 96.9%, 88%, 84.3%, 88% and 91.1% using 0.3 g/g (Ca(OH)(2)/soil). The overall extraction efficiencies of La, Dy, Er, Cd and Pb were 53.9%, 73.2%, 71.7%, 95.9% and 38.8% by three times using the recovered TS solution. The extractable fractions of La, Dy, Er, Cd and Pb in soil were found to be highest in their acid soluble and reducible forms. Mechanisms studies indicated the increased binding strength (I-R) and the decreased mobility (M-F) of REEs and metals after the flushing with TS. Carboxyl groups in TS were attributed to the formation of complexation and agglomeration between TS and studied REEs and other metals, confirmed by the analysis of both the X-ray photoelectron spectroscopy (XPS) and the dynamic light scattering (DLS). This study established an environmentally-friendly contaminated soil remediation and the recovery of valuable REEs by the combination use of TS and calcium hydroxide. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	Biosurfactant Tea saponin (TS) Rare earth elements (REEs) soil flushing Recovery Extraction
DOI	10.1016/j.chemosphere.2020.127070
关键词[WOS]	HEAVY-METALS ; SAPONIN ; STABILIZATION ; REMEDIATION ; TECHNOLOGY ; ADSORPTION ; GADOLINIUM ; REMOVAL ; RIVER ; PB
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[21676001] ; National Key Research and Development program of China-Intergovernmental International Scientific and Technological Innovation Cooperation[2017YFE0105500]
WOS研究方向	Environmental Sciences & Ecology
项目资助者	National Natural Science Foundation of China ; National Key Research and Development program of China-Intergovernmental International Scientific and Technological Innovation Cooperation
WOS类目	Environmental Sciences
WOS记录号	WOS:000540870300050
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/27353
专题	中国科学院广州能源研究所
通讯作者	Cao, Yan
作者单位	1.Anhui Univ, Coll Chem & Chem Engn, Hefei 230601, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 3.CAS Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 4.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Li, Qiqi,Zhong, Huiqiong,Cao, Yan. Effective extraction and recovery of rare earth elements (REEs) in contaminated soils using a reusable biosurfactant[J]. CHEMOSPHERE,2020,256:10.
APA	Li, Qiqi,Zhong, Huiqiong,&Cao, Yan.(2020).Effective extraction and recovery of rare earth elements (REEs) in contaminated soils using a reusable biosurfactant.CHEMOSPHERE,256,10.
MLA	Li, Qiqi,et al."Effective extraction and recovery of rare earth elements (REEs) in contaminated soils using a reusable biosurfactant".CHEMOSPHERE 256(2020):10.