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RESEARCH ARTICLE
Contents Vol 6(1)

Relationship between oxidative degradation of 2-mercaptobenzothiazole and physicochemical properties of manganese (hydro)oxides

C. S. Liu A C , L. J. Zhang A , C. H. Feng B , C. A. Wu A , F. B. Li A D and X. Z. Li C
+ Author Affiliations
- Author Affiliations

A Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, No. 808, Tianyuan Road, Guangzhou 510650, China.

B School of Chemistry and Chemical Engineering, South China University of Technology, No. 381, Wushan Road, Guangzhou 510640, China.

C Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong 999077, China.

D Corresponding author. Email: cefbli@soil.gd.cn

Environmental Chemistry 6(1) 83-92 https://doi.org/10.1071/EN08053
Submitted: 11 August 2008  Accepted: 8 January 2009   Published: 3 March 2009

Environmental context. Manganese (hydro)oxide is one kind of the most important natural minerals that are capable of oxidising organic contaminants with a wide range of functionality. However, the oxidative reactivity of manganese (hydro)oxides for organic pollutant degradation may depend on their individual physicochemical properties. It is important to determine a relationship between their oxidative reactivity and physicochemical properties.

Abstract. The oxidative reactivity of manganese (hydro)oxides is important for geochemical transformation of organic pollutants. Here, 2-mercaptobenzothiazole (MBT) degradation by six manganese (hydro)oxides, including γ-MnOOH, β-MnO2, α-MnO2, γ-Mn2O3, δ-MnO2, and MO-700, were investigated with different initial MBT concentrations, manganese (hydro)oxide dosages and pH values. The results show the oxidative reactivity of manganese (hydro)oxides towards MBT degradation strongly depends on their physicochemical properties. Specific surface area and reduction potential of manganese (hydro)oxides were positively correlated with MBT degradation rates, whereas pH at the point of zero charge (pHPZC) of manganese (hydro)oxides and apparent activation energy (Ea) were negatively correlated. A high average oxidation state with the same chemical valence always corresponds to high oxidative reactivity. Such findings provide some insights into understanding the transport and fate of organic pollutants in the presence of different manganese (hydro)oxides in the natural environment.

Additional keywords: correlative analysis, manganese oxides, organic pollutants, oxidation.


Acknowledgements

The work was financially supported by the National Natural Science Foundation of People’s Republic of China (20577007).


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