Formation Mechanism and Characterization of Mn(Ⅲ)-Humic Ligands Colloids in Ground Water Environment

被引：1
作者：
Cheng Y. [1 ]
Deng Y. [1 ]
Xue J. [2 ]
Zhang Y. [2 ]
机构：
[1] School of Environmental Studies, China University of Geosciences, Wuhan
[2] Geological Survey, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2024年 / 49卷 / 02期
关键词：
groundwater; Mn(Ⅲ); olloid stability; omplexation mechanism; umic ligands;
D O I：
10.3799/dqkx.2022.145
中图分类号：
学科分类号：
摘要：
Mn(Ⅲ) is the intermediate electron transport of manganese cycling, widely involved in the terrestrial and marine ecosystems in the geochemical cycle of carbon, iron and sulfur. Recently, Mn(Ⅲ) ‐ humic ligands colloids are found in oxide, suboxic and anoxic zone.It is of great significance to study the formation mechanism and behavior characteristics of Mn(Ⅲ)‐humic colloid in groundwater environment for understanding the geochemical cycle of manganese and the migration and transformation mechanism of nutrients and pollutants affected by it. In this study, batch experiments were conducted to explore the effects of oxygen conditions, humus concentration and organic matter species on the formation of Mn(Ⅲ) ‐ humic ligands colloids andcombined with FTIR, XRD, XPS, TEM and other means to characterize the physicochemical properties and stability. Resultsshow that suboxic and anoxic environments favor Mn(Ⅲ)‐humiccolloid formation. The degree of complexation of Mn(Ⅲ)humic colloid increases with the increase of humic ligands concentration. FA is more easily complexed with Mn(Ⅲ), but the colloidal stability is worse than that of Mn(Ⅲ) ‐ HA colloid. Furthermore, Mn(Ⅲ) ‐ humic colloid is in an amorphous form, and oxygen‐containing functional groups such as carboxyl groups on humus form an internal sphere complex with Mn(Ⅲ), which can stabilize Mn(Ⅲ) and slow down the degree of disproportionation. Mn(Ⅲ) ‐ humic colloid has oxidation and adsorption capacity, which has important environmental significance for the migration and transformation of pollutants in groundwater. © 2024 China University of Geosciences. All rights reserved.
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页码：793 / 802
页数：9
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