Cadmium and Arsenic Interactions During Co-adsorption onto Goethite

被引：1
作者：
Su Z.-X. [1 ,2 ]
Liu S.-H. [3 ]
Guan Y.-F. [1 ]
Tao L. [2 ]
机构：
[1] School of Environmental Science, South China Normal University, Guangzhou
[2] Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Institute of Eco-Environment and Soil Sciences, Guang
[3] Huangpu Technology Center, Guangzhou Municipal Ecological Environment Bureau, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 07期
关键词：
arsenic(As); cadmium(Cd); co-adsorption; goethite; ternary complex;
D O I：
10.13227/j.hjkx.202207194
中图分类号：
学科分类号：
摘要：
Cadmium (Cd) and arsenic (As) are commonly co-adsorbed onto iron oxides in the soil environment, especially in south China. This study aimed to elucidate the regulatory mechanisms in determining the As(V)-Cd(II) interactions on a goethite interface after excluding pH interference. At pH 6.0, the results obtained illustrated that As(V) and Cd(II) adsorbed onto goethite obeyed the pseudo-second-order kinetic model, and the adsorption processes were mainly chemical adsorption. Furthermore, As(V) adsorbed onto goethite were mainly inner ring adsorption and monolayer adsorption both in the single adsorption process and in co-adsorption processes with Cd(II). For comparison, Cd(II) adsorbed onto goethite also demonstrated inner ring adsorption and monolayer adsorption during single adsorption, and As(V)-Cd(II) co-adsorption were transformed to outer ring adsorption and multilayer adsorption processes. Through analysis by Zeta potential, X-ray diffraction, and X-ray photoelectron spectroscopy, electrostatic adsorption and formation of ternary complexes (Fe-As-Cd) were proven to be the critical mechanisms in determining the interactions between As(V) and Cd(II) during their co-adsorption processes. The results obtained in this study should help us to further understand the micro-chemical interaction processes of heavy metals on the soil environment. © 2023 Science Press. All rights reserved.
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页码：3970 / 3977
页数：7
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