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Application of Fered-Fenton process for m-phenylenediamine degradation.

Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering (2013-04-12)
Chia-Chi Su, Laarni V Panopio, Genandrialine L Peralta, Ming-Chun Lu
ABSTRACT

This study was undertaken to investigate the feasibility of applying the Fered-Fenton process to the degradation of m-phenylenediamine, by examining the effect of varying the initial H2O2 and Fe(2+) concentrations, the initial pH and electric current on the process efficiency. The degradation behavior of m-phenylenediamine was also compared to that of aniline. The Fered-Fenton reactor consists of anodes and cathodes with mesh-type titanium metal coated with IrO2/RuO2 and stainless steel, respectively. The experiments showed that m-phenylenediamine was rapidly degraded by the Fered-Fenton process. Initial pH of 3.2 is optimal for the removal of m-phenylenediamine and chemical oxygen demand (COD). m-Phenylenediamine and COD removal efficiencies increased with the increasing electrical current from 0 A to 4 A, and decreased with a further increase in electrical current. Optimum efficiency resulting in 100% degradation of m-phenylenediamine and elimination of 30% of COD was achieved at pH 3.2 at 60 min in the presence of 10 mM of m-phenylenediamine, 0.268 mM of Fe(2+), 43.6 mM of H2O2, and under a current of 4 A.

MATERIALS
Product Number
Brand
Product Description

Supelco
Aniline solution, certified reference material, 5000 μg/mL in methanol
Sigma-Aldrich
Aniline-1-13C, 99 atom % 13C
Sigma-Aldrich
Aniline hydrochloride, ≥99%
Sigma-Aldrich
Aniline-4-13C, 99 atom % 13C
Supelco
Aniline, analytical standard
Sigma-Aldrich
m-Phenylenediamine, flakes, 99%
Sigma-Aldrich
Aniline, ReagentPlus®, 99%
Sigma-Aldrich
Aniline, ACS reagent, ≥99.5%