期刊
CHEMICAL GEOLOGY
卷 459, 期 -, 页码 119-128出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2017.04.012
关键词
Iron oxide; Organic matter; Copper; Arsenate; Surface complexation model
资金
- Xunta Galicia [EM2013/040]
- program Group of Excellence [GI-1245 (GRC2014/003)]
- CRETUS Strategic Group [AGRUP 2015/02]
Goethite is a common iron oxide present in the environment. It is used as a model system to represent the mineral fraction of the soil, whereas humic acid is used as a model system to represent natural organic matter (NOM). In this study, we tried to understand the behaviour of anionic and cationic pollutants in a model system, which could easily represent the organic-mineral interaction in the environment. Specifically, the retention of arsenate and copper over different organo-mineral systems was studied. The obtained results show an increase in the adsorption of copper as the pH and the C content in the organo-mineral composites was raised, whereas in the case of the arsenate, the opposite behaviour was observed. The adsorption behaviour was compared with that of the end-members goethite and humic acid. Furthermore, the NOM-CD model (natural organic matter charge distribution model) was used to describe the reactivity of the pollutants in the solid/solution interphase and to predict the surface and aqueous speciation. To simulate the behaviour of the organo-mineral composites, a surface component was included to describe the chemical and electrostatic interactions of the NOM with the goethite in the modelling of the solid/solution interphase. This approximation allows the quantification of the effective organic matter, which can be used to describe the copper and arsenate reactivity in organo-mineral systems.
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