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The oxidative degradation of 2-mercaptobenzothiazole at the interface of β-MnO2 and water
- Source :
-
Journal of Hazardous Materials . Jun2008, Vol. 154 Issue 1-3, p1098-1105. 8p. - Publication Year :
- 2008
-
Abstract
- 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 (r init) 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 5.62kJ/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. [Copyright &y& Elsevier]
- Subjects :
- *HYDROGEN-ion concentration
*ACIDITY function
*MANGANESE
*POLLUTANTS
Subjects
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 154
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 31922439
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2007.11.015