Highly Efficient Microwave‐Assisted Fenton Degradation of Toluene Nitration Wastewater over Microwave‐Responsive Catalyst of Fe3O4−BiOCl

Abstract

AbstractMicrowave‐assisted Fenton process over a high microwave‐responsive catalyst (Fe3O4−BiOCl) was developed. The morphology, composition and magnetic recovery of the prepared catalyst were analyzed. Correspondingly, the optimal reaction conditions were obtained and the catalyst had a good recovery performance. A good degradation result (COD removal efficiency=82.57 %, TOC removal efficiency=85.15 %, TN removal efficiency=80.86 %) was obtained with low energy consumption and chemical inputs, which proved that the system has a certain industrialization prospect. Furthermore, take p‐nitrophenol (PNP) as an example, The reaction mechanism of this process had been investigated. The reaction was divided into three stages: 1. Activation 2. Oxidation 3. Mineralization. In the Oxidation phase, the reaction followed zero‐order reaction kinetics model and the rate constant was 0.0642 mM s−1. To investigate the kinetics, a heterogeneous Fenton‐photocatalysis synergistic degradation mechanism based on experimental data was proposed.