Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/26566
Title: The oxidative degradation of 2-mercaptobenzothiazole at the interface of β-MnO2 and water
Authors: Li, F
Liu, C
Liang, C
Li, X
Zhang, L
Keywords: 2-Mercaptobenzothiazole
Carboxylic acids
Interface
Manganese oxide
Pyrolusite
Issue Date: 2008
Publisher: Elsevier
Source: Journal of hazardous materials, 2008, v. 154, no. 1-3, p. 1098-1105 How to cite?
Journal: Journal of hazardous materials 
Abstract: To investigate the oxidative degradation of organic pollutants at the interface of manganese oxides and water, β-MnO2 was prepared and its crystal structure and the specific surface area were examined by X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) methods, respectively. 2-Mercaptobenzothiazole (MBT) as a model chemical was used to study its oxidative degradation reaction in β-MnO2 suspension. The experimental results showed that MBT was effectively degraded and mineralized into SO4 2- and NO3 - by β-MnO2. In the meantime, it was found that β-MnO2 could be reductively dissolved, and aqueous and adsorbed Mn2+ was generated. The kinetics of MBT degradation by β-MnO2 is a function of initial MBT concentration, β-MnO2 dosage and pH value. At pH 4.6, apparent reaction orders with respect to initial MBT concentration and β-MnO2 dosage were determined to be 0.88 and 0.27, respectively. The initial reaction rate (rinit) is of pH dependence with a reaction order of -0.36. The thermodynamics of MBT degradation by β-MnO2 was also investigated, and the apparent activation energy was calculated to be 5.62 kJ/mol. The inhibited effect of carboxylic acids (oxalic, citric, tartaric, and malic acids) or metal ions (Ni2+, Ca2+, Mn2+ and Cr3+) on the oxidative degradation of MBT by β-MnO2 was also investigated. This investigation will give some new insights for understanding the interaction of organic pollutants with manganese oxides in natural soils and sediments.
URI: http://hdl.handle.net/10397/26566
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2007.11.015
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