title: Evaluation of the mercaptobenzothiazole degradation by combined adsorption process and Fenton reaction using iron mining residue.
abstract: The present study investigated the degradation of mercaptobenzothiazole (MBT), evaluating homogeneous and heterogeneous systems. An iron mineral residue from the desliming step of iron mining was used as a source in the Fenton-like reaction (advanced oxidation process). A granulometric analysis of the residue was performed and yielded fractions with high hematite (Fe2O3) and low quartz content in sieves from 74 to below 44 mm. In this particle size range, the hematite content from 58.9% to 67.4% and the Brunauer-Emmett-Teller area from 0.1345 to 1.3137 m2g-1were obtained. The zeta potential curves as a function of pH were obtained for the residue, the MBT solution and mixtures thereof. The adsorption of MBT in the residue and its degradation through the Fenton-like reaction were investigated. Adsorption tests and the Fenton-like reaction were carried out, where the MBT species and the residue are oppositely charged, yielding, respectively, 10% MBT adsorption on the surface of the residue and 100% MBT degradation by the Fenton-like reaction at pH 3, hydrogen peroxide concentration of 25 mg L-1, residue concentration of 3 g L-1, 200 rpm and 25°C, from a 100 mg L-1MBT solution. MBT degradation was found to occur mainly by the heterogeneous Fenton-like process.
authors: a School of Chemistry - Federal University of Rio de Janeiro , Rio de Janeiro , Brazil.|b Department of Engineering , UGB - (University Center Geraldo Di Biase) , Barra do Pirai, Rio de Janeiro , Brazil.
authors: Adriana Lau da Silva
authors: ALDS
authors: Martins
authors: c Department of Chemical Engineering and Materials , PUC-Rio (Pontifical Catholic University of Rio de Janeiro) , Rio de Janeiro , Brazil.|d Peróxidos do Brasil Ltda (Solvay Group) , Curitiba-PR , Brazil.
authors: Luís Alberto César
authors: LAC
authors: Teixeira
authors: a School of Chemistry - Federal University of Rio de Janeiro , Rio de Janeiro , Brazil.
authors: Fabiana Valéria
authors: FV
authors: da Fonseca
authors: a School of Chemistry - Federal University of Rio de Janeiro , Rio de Janeiro , Brazil.
authors: Lídia
authors: L
authors: Yokoyama
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007501:Iron; D008906:Mining; D010084:Oxidation-Reduction; D013438:Sulfhydryl Compounds
chemical_list: D005290:Ferric Compounds; D013438:Sulfhydryl Compounds; D006861:Hydrogen Peroxide; D007501:Iron
keywords: AOP; Degradation; adsorption; fenton-like; mercaptobenzothiazole