Description:
Microwave-assisted Fenton process over a high microwave-responsive catalyst (Fe3O4-BiOCl) was developed to environment-friendly treat toluene nitrification wastewater. The morphology, composition and magnetic recovery of the prepared catalyst were analyzed using various analytical instruments. The heterogeneous Fenton catalytic effect of Fe3O4-BiOCl was confirmed by control experiment. Correspondingly, the main influencing factors such as H2O2 dosages, MW output power, initial pH, MW irradiation time were studied and the optimal reaction conditions are obtained. Afterwards, a reusability experiment was carried out. The COD removal efficiency of the seventh round still reached 80.12%. In addition, a pilot test was carried out with toluene nitrification wastewater and a good degradation effect (COD removal efficiency=82.57%, TOC removal efficiency=78.52%, TN removal efficiency=73.38%) was obtained, which proved that the system has a certain industrialization prospect. In addition, the MW-assisted Fe3O4-BiOCl/H2O2 system used lower energy consumption and chemical inputs to achieve a higher degradation effect. Furthermore, take p-nitrophenol (PNP) as an example, The reaction mechanism of the MW-assisted Fenton process had been further investigated with general significance. The MW-assisted Fe3O4-BiOCl/H2O2 Fenton 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 confirm the reason behind the zero-order reaction kinetics, a cooperative reaction mechanism based on experimental data was proposed. Finally, based on the NH3-N, NO2-N measurement in the Mineralization period, the distribution of the N element was studied