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Adsorption of cadmium on clay-organic associations in different pH solutions: The effect of amphoteric organic matter
Wenpo Xu; Chengshuai Liu; Jian-Ming Zhu; Hongling Bu; Hui Tong; Manjia Chen; Decan Tan; Ting Gao; Yizhang Liu
2022
Source PublicationEcotoxicology and Environmental Safety
Volume236Pages:113509
Abstract

Clay minerals are important soil components and usually coexist with organic matter, forming mineral-organic associations (MOAs), which control the speciation, mobility, and bioavailability of heavy metals. However, the adsorption mechanism of cadmium (Cd) by MOAs is still unclear, especially for the associations of amphotericorganic matter and clay minerals. In this study, 12-aminododecanoic acid (ALA) and montmorillonite (Mt) were chosen to prepare MOAs via intercalation (Mt-ALA composite) and physical mixing (Mt-ALA mixture). Batch experiments were conducted to investigate the adsorption mechanism of Cd(II) by MOAs under different pH values and initial Cd(II) concentrations. The results showed that the Cd(II) adsorption capacities followed as Mt > Mt-ALA mixture > Mt-ALA composite under acidic conditions, Mt-ALA mixture > Mt > Mt-ALA composite under neutral conditions, and Mt-ALA mixture > Mt-ALA composite > Mt under alkaline conditions, suggesting the adsorption behaviors of Cd(II) by MOAs were primarily constrained by the speciation of ALA and solution pH. Under acidic conditions, cationic HALA+ could intercalate into the interlayer of Mt and occupy the adsorption sites, reducing the adsorption capacity of Cd(II). As pH increased to neutral, HALA+ decreased and changed to a zwitterionic state, which caused ALA to release out from the interlayer of Mt-ALA composite or not easily enter into Mt-ALA mixture and promoted Cd(II) adsorption. Under alkaline conditions, the increase of anion ALA- would cause ALA to be mainly adsorbed on the surface of Mt and chelate with Cd(II), enhancing the adsorption of Cd(II). Further analysis by Fourier transform infrared and X-ray photoelectron spectroscopy indicated that the carboxyl and amino groups of ALA both participated in the adsorption of Cd(II). These findings could extend the knowledge on the mobility and fate of Cd in clay-based soils and be used as a basis for understanding the biogeochemical behavior of Cd in the environment.

KeywordCadmium montmorillonite clay-Organic Complexes adsorption amphoteric Organic Matter
DOI10.1016/j.ecoenv.2022.113509
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Indexed BySCI
Language英语
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Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13565
Collection环境地球化学国家重点实验室
Affiliation1.National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Gua
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
Recommended Citation
GB/T 7714
Wenpo Xu,Chengshuai Liu,Jian-Ming Zhu,et al. Adsorption of cadmium on clay-organic associations in different pH solutions: The effect of amphoteric organic matter[J]. Ecotoxicology and Environmental Safety,2022,236:113509.
APA Wenpo Xu.,Chengshuai Liu.,Jian-Ming Zhu.,Hongling Bu.,Hui Tong.,...&Yizhang Liu.(2022).Adsorption of cadmium on clay-organic associations in different pH solutions: The effect of amphoteric organic matter.Ecotoxicology and Environmental Safety,236,113509.
MLA Wenpo Xu,et al."Adsorption of cadmium on clay-organic associations in different pH solutions: The effect of amphoteric organic matter".Ecotoxicology and Environmental Safety 236(2022):113509.
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