title: Effect of the iron oxide catalyst on o-toluidine oxidation by the fluidized-bed fenton process.
abstract: This study investigates the effects of the Fe2+ concentration and synthetic iron oxide catalysts on o-toluidine degradation using a fluidized-bed Fenton process. The mineralization ofo-toluidine in the synthetic catalyst system is also examined. The H3.5 and H7.3 Fe/SiO2 and A7.8 and A 12.5 Fe/SiO2 catalysts were successfully synthesized by adding H202 and injecting air process, respectively. The optimum initial ferrous ion concentration for degradation of 1 mM o-toluidine was 1 mM. Experimental results reveal that 1 mM o-toluidine can be 100% degraded at 60 and 120 min in the modified fluidized-bed Fenton process with A7.8 Fe/SiO2 and the conventional fluidized-bed Fenton process with SiO2 carrier, respectively, when the optimum conditions of 1mM Fe2+ and 17mM H202 at pH 3 were used. The A7.8 Fe/SiO2 catalyst had a stronger oxidation ability than the H3.5 Fe/SiO2, H7.3 Fe/SiO2 and A12.5 Fe/SiO2 catalysts, and was attributed to the high iron content on the surface of the SiO2 support. The Fenton and Fenton-like reactions occurred in the A7.8 Fe/SiO2 catalyst system. Degradation of o-toluidine in the Fenton-like process follows pseudo-first-order kinetics. The A7.8 Fe/SiO2 catalyst efficiently enhanced o-toluidine oxidation under the pH range of 2-4.
authors.affiliation: Department of Environmental Resources Management, Chia-Nan University of Pharmacy and Science, Tainan 717, Taiwan.
authors.forename: Chia-Chi
authors.initials: CC
authors.lastname: Su
authors.affiliation: Department of Environmental Resources Management, Chia-Nan University of Pharmacy and Science, Tainan 717, Taiwan.
authors.forename: Chun-Cheng
authors.initials: CC
authors.lastname: Fan
authors.affiliation: National Center of Excellence for Environmental and Hazardous Waste Management, Department of Environmental Engineering, Faculty of Engineering, King Mongkut 's University of Technology, Thonburi, Bangkok 10140, Thailand.
authors.forename: Jin
authors.initials: J
authors.lastname: Anotai
authors.affiliation: Department of Environmental Resources Management, Chia-Nan University of Pharmacy and Science, Tainan 717, Taiwan.
authors.forename: Ming-Chun
authors.initials: MC
authors.lastname: Lu
mesh_terms: D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D012212:Rheology / Q000295:instrumentation / Q000379:methods*; D014052:Toluidines / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: C045076:Fenton's reagent; D005290:Ferric Compounds; D014052:Toluidines; C000499:ferric oxide; C023622:2-toluidine; D006861:Hydrogen Peroxide; D007501:Iron