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  • Comparison of o-toluidine degradation by Fenton, electro-Fenton and photoelectro-Fenton processes.

Comparison of o-toluidine degradation by Fenton, electro-Fenton and photoelectro-Fenton processes.

Journal of hazardous materials (2011-10-19)
Jin Anotai, Somporn Singhadech, Chia-Chi Su, Ming-Chun Lu
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
o-Toluidine solution, 0.6 M in glacial acetic acid, contains thiourea as stabilizer
Sigma-Aldrich
o-Toluidine, ≥99%
Sigma-Aldrich
o-Toluidine, 98%
Sigma-Aldrich
o-Toluidine, purum p.a., ≥99.5% (GC)