Cd Adsorption by Iron–Organic Associations: Implications for Cd Mobility and Fate in Natural and Contaminated Environments

The mobility and fate of Cd in soil are mainly controlled by active substances such as iron minerals and organic matter. Iron minerals and organic matter often coexist in the form of iron–organic associations (IOA), which have large specific surface areas and many functional groups, potentially affe...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 2021-01, Vol.106 (1), p.109-114
Main Authors: Mao, Yijie, Fan, Weiguo, Yan, Yaxin, Xiang, Wu, Hu, Shenghong, Yan, Sen
Format: Article
Language:English
Subjects:
Active control
Adsorption
Aquatic Pollution
Cadmium
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Functional groups
Iron
Minerals
Mobility
Organic matter
pH effects
Pollution
Protons
Soil
Soil contamination
Soil Pollutants
Soil Science & Conservation
Speciation
Surface charge
Surface chemistry
Tomography
Waste Water Technology
Water Management
Water Pollution Control
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Summary:The mobility and fate of Cd in soil are mainly controlled by active substances such as iron minerals and organic matter. Iron minerals and organic matter often coexist in the form of iron–organic associations (IOA), which have large specific surface areas and many functional groups, potentially affecting Cd adsorption. However, little is known about Cd adsorption by IOA. This study investigated Cd adsorption by the synthetic IOA under different conditions. The results indicate Cd adsorption increased with the increasing amount of IOA, while the adsorption efficiency decreased gradually. pH significantly affects Cd adsorption, because the Cd speciation and the surface charge of IOA changed under different pH conditions. Under alkaline condition, part of Cd would form hydroxide precipitate, facilitating Cd adsorption by IOA. The composition of organic matter in IOA didn’t significantly affect Cd adsorption.
ISSN:0007-4861
1432-0800
DOI:10.1007/s00128-020-02962-2