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Modeling coupled kinetics of antimony adsorption/desorption and oxidation on manganese oxides

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Abstract

Understanding the kinetic reactions of antimony (Sb) at the MnO2–water interface is essential for predicting the dynamic behavior of Sb in soil environments. In this study, we developed a quantitative model for assessing the coupling between Sb(III) oxidation and Sb(III)/Sb(V) adsorption/desorption kinetics and the role of each individual reaction process in controlling the overall reaction rates. Based on our modeling results, Sb(III) oxidation rates were very fast at the early stages of the reactions and may significantly slow down with time, and Sb(III) and Sb(V) showed different adsorption behavior on δ-MnO2. Our kinetics model is able to account for different adsorption/desorption kinetics of Sb(III) and Sb(V) and the changes of Sb(III) oxidation rates during the coupled kinetic processes, which provides a general modeling framework for predicting Sb kinetic behavior at the MnO2–water interface.

Graphical abstract: Modeling coupled kinetics of antimony adsorption/desorption and oxidation on manganese oxides

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Publication details

The article was received on 22 Jul 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8EM00323H
Citation: Environ. Sci.: Processes Impacts, 2018, Advance Article
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    Modeling coupled kinetics of antimony adsorption/desorption and oxidation on manganese oxides

    Z. Shi, S. Peng, P. Wang, Q. Sun, Y. Wang, G. Lu and Z. Dang, Environ. Sci.: Processes Impacts, 2018, Advance Article , DOI: 10.1039/C8EM00323H

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