Rapidly reducing cadmium from contaminated farmland soil by novel magnetic recyclable Fe3O4/mercapto-functionalized attapulgite beads

doi:10.1016/j.envpol.2024.124056

	Rapidly reducing cadmium from contaminated farmland soil by novel magnetic recyclable Fe3O4/mercapto-functionalized attapulgite beads
	Liu, Guoming 1; Tu, Chen1 ; Li, Yuan2,3 ; Yang, Shuai 1; Wang, Qihao 1; Wu, Xinyou 1,4; Zhou, Tong 1; Luo, Yongming1
发表期刊	ENVIRONMENTAL POLLUTION
ISSN	0269-7491
	2024-06-15
卷号	351 页码:12
关键词	Cadmium Farmland soil Magnetic mercapto-functionalized attapulgite beads Removal Reusability
DOI	10.1016/j.envpol.2024.124056
通讯作者	Luo, Yongming([email protected])
英文摘要	Reducing cadmium (Cd) content from contaminated farmland soils remains a major challenge due to the difficulty in separating commonly used adsorbents from soils. This study synthesized novel millimeter-sized magnetic Fe3O4/mercapto-functionalized attapulgite beads (MFBs) through a facile one-step gelation process incorporating alginate. The MFBs inherit the environmental stability of alginate and enhance its mechanical strength by hybridizing Fe3O4 and clay mineral components. MFBs can be easily separated from flooded soils by magnets. When applied to 12 Cd-polluted paddy soils and 14 Cd-polluted upland soils, MFBs achieved Cd(II) removal rates ranging from 16.9% to 62.2% and 9.8%-54.6%, respectively, within a 12-h period. The MFBs predominantly targeted the exchangeable and acid soluble, and reducible fractions of Cd, with significantly enhanced removal efficiencies in paddy soils compared to upland soils. Notably, MFBs exhibited superior adsorption performance in soils with lower pH and organic matter (OM) content, where the bioavailability and mobility of Cd are heightened. The reduction of Cd content by MFBs is a sustainable and safe method, as it permanently removes the bioavailable Cd from soil, rather than temporarily reducing its bioavailability. The functional groups such as -SH, -OH, present in attapulgite and alginate of MFBs, played a crucial role in Cd(II) adsorption. Additionally, attapulgite and zeolite provided a porous matrix structure that further enhanced Cd(II) adsorption. The results of X-ray photoelectron spectroscopy suggested that both chemical precipitation and surface complexation contributed to Cd(II) removal. The MFBs maintained 87.6% Cd removal efficiency after 5 regeneration cycles. The surface of the MFBs exposed new adsorption sites and increased the specific surface area during multiple cycles with Cd-contaminated soil. This suggests that MFBs treatment with magnetic retrieval is a potentially effective pathway for the rapid removal of Cd from contaminated farmland soils.
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Independent Deployment Project of the Institute of Soil Science, CAS
收录类别	SCI
语种	英语
关键词[WOS]	DISSOLVED ORGANIC-MATTER ; CLAY-MINERALS ; HEAVY-METALS ; REMOVAL ; ADSORPTION ; REMEDIATION ; MERCAPTO ; COMPOSITES ; ADSORBENTS ; EXTRACTION
研究领域[WOS]	Environmental Sciences & Ecology
WOS记录号	WOS:001237111200001
引用统计
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/35975
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
通讯作者	Luo, Yongming
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China 3.YICCAS, Shandong Key Lab Coastal Environm Proc, Yantai 264003, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Guoming,Tu, Chen,Li, Yuan,et al. Rapidly reducing cadmium from contaminated farmland soil by novel magnetic recyclable Fe3O4/mercapto-functionalized attapulgite beads[J]. ENVIRONMENTAL POLLUTION,2024,351:12.
APA	Liu, Guoming.,Tu, Chen.,Li, Yuan.,Yang, Shuai.,Wang, Qihao.,...&Luo, Yongming.(2024).Rapidly reducing cadmium from contaminated farmland soil by novel magnetic recyclable Fe3O4/mercapto-functionalized attapulgite beads.ENVIRONMENTAL POLLUTION,351,12.
MLA	Liu, Guoming,et al."Rapidly reducing cadmium from contaminated farmland soil by novel magnetic recyclable Fe3O4/mercapto-functionalized attapulgite beads".ENVIRONMENTAL POLLUTION 351(2024):12.