ABSTRACT
Air-catalytic oxidation is an environmentally friendly, energy-efficient, and low-cost method for the degradation and treatment of sulfur-containing wastewater, and the treatment effect of this method depends on the catalyst performance. Manganese oxide (MnOx) is a commonly used catalyst in the air catalytic oxidation process, but its catalytic performance needs to be improved. This paper is to explore a method to improve the performance of MnOx catalyst. Based on the principle of catalyst doping modification, the research idea of improving the catalytic performance of MnOx catalyst by doping it with rare earth element Ce was proposed. The experiment prepared the activated carbon-loaded MnOx catalyst (MnOxCeO2/AC) with different Ce contents and evaluated its effect on catalytic air oxidation degradation of sulfur-containing wastewater, and relevant experimental results and conclusions were obtained: 1. Doping with rare earth element Ce can significantly improve the performance of MnOx/AC catalyst, and the best performance conditions of the catalyst were optimized; 2. Single-factor experiments evaluated the effects of aeration, temperature, catalyst dosage, desulfurization rate, and initial sulfur content of wastewater on the desulfurization effect; 3. Mechanistic studies showed that the sulfide degradation in wastewater underwent a transformation from S2to S2O32 and the degradation of sulfide in wastewater underwent the process of conversion from S2-toS2O32- and finally toSO42-.
