Kinetics Oxidation Reaction of Wastewater Containing Phenolic Compounds by H2O2 and Fe/SUZ-4 Zeolite

Abstract

By using synthesized Fe/SUZ-4 zeolite catalysts and hydrogen peroxide (H₂O₂) oxidation agent, the degradation reactions of Phenol, 2,4-Dichlorophenol, and 4-Chlorophenol with the concentrations of 100, 40 and 100 mg/l respectively were carried out at pH 3.0 for 300 minutes. The analysis of the rice husk ash (RHA) found that the raw material contained 99.7% SiO₂ and the amount of Fe in SUZ-4 was found to be 4.72 wt. %. The synthesized SUZ-4 has a micro-structure of needle-shaped crystals approximately 0.2 μ m in diameter and 5.0 μ m in length. The ion-exchanged SUZ-4 zeolite (Fe/SUZ-4) was used since the degradation rate obtained was actually higher than that of the reaction without ion-exchanged zeolite. The rate of reaction were investigated and it was found that the degradation rates slightly increase with increasing the phenol concentration. In the same way, the variation of H₂O₂ was also investigated and the result indicates that the degradation rates also slightly increase as the H₂O₂ concentration increases. The kinetics of the corresponding reactions was found that the degradation reactions of Phenol, 2,4-Dichlorophenol and 4-Chlorophenol can be classified as a first-order reaction.