title: Comparison of o-toluidine degradation by Fenton, electro-Fenton and photoelectro-Fenton processes.
abstract: A Box-Behnken design (BBD) statistical experimental design was used to investigate the degradation of o-toluidine by the electro-Fenton process. This method can be used to determine the optimal conditions in multivariable systems. Fe(2+) concentration (0.2-1.0mM), H(2)O(2) concentration (1-5mM), pH (2-4), and current (1-4A) were selected as independent variables. The removal efficiencies for o-toluidine and chemical oxygen demand (COD) were represented by the response function. Result by 2-level factorial design show that the pH and the Fe(2+) and H(2)O(2) concentrations were the principal parameters. Among the main parameters, the removal efficiencies for o-toluidine and COD were significantly affected by pH and Fe(2+) concentration. From the Box-Behnken design predictions, the optimal conditions in the electro-Fenton process for removing 90.8% of o-toluidine and 40.9% of COD were found to be 1mM of Fe(2+) and 4.85 mM of H(2)O(2) at pH 2. Under these optimal conditions, the experimental data showed that the removal efficiencies for o-toluidine and COD in the electro-Fenton process and the photoelectro-Fenton process were more than 91% and 43%, respectively, after 60 min of reaction. The removal efficiencies for o-toluidine and COD in the Fenton process are 56% and 27%, respectively.
authors: 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: Jin
authors: J
authors: Anotai
authors: Somporn
authors: S
authors: Singhadech
authors: Chia-Chi
authors: CC
authors: Su
authors: Ming-Chun
authors: MC
authors: Lu
mesh_terms: D000704:Analysis of Variance; D057919:Biological Oxygen Demand Analysis; D055664:Electrochemical Techniques; D004867:Equipment Design; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008962:Models, Theoretical; D055668:Photochemical Processes; D014052:Toluidines / Q000302:isolation & purification*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data
chemical_list: C045076:Fenton's reagent; D014052:Toluidines; D014874:Water Pollutants, Chemical; C023622:2-toluidine; D006861:Hydrogen Peroxide; D007501:Iron