Catalytic Ozonation for Effective Degradation of Coal Chemical Biochemical Tail Water by Mn/Ce@RM Catalyst

An Mn/Ce@red mud (RM) catalyst was prepared from RM via a doping–calcination method. Scanning electron microscopy, X-ray diffraction, and photoelectron spectroscopy were used to characterize the surface morphology, crystal elemental composition of Mn/Ce@RM catalyst, respectively. In addition, preparation catalytic ozonation conditions optimized, mechanism discussed. Lastly, fuzzy analytic hierarchy process (FAHP) adopted evaluate degradation coal chemical biochemical tail water. The best for found be as follows: (1) active component loading 3%, (2) Mn/Ce doping ratio 2:1, (3) calcination temperature 550 °C, (4) time 240 min, (5) fly ash floating bead 10%. oxygen demand (COD) removal rate 76.58% under this condition. characterization results suggested that pore structure optimized significantly improved. Mn Ce successfully loaded on in form MnO2 CeO2. operating study reaction 80 initial pH 9, ozone dosage 2.0 g/h, 62.5 g/L, COD 84.96%. Mechanism analysis showed hydroxyl radicals (•OH) played leading role degrading organics water, adsorption direct oxidation secondary role. FAHP established basis environmental impact, economic benefit, energy consumption. Comprehensive evaluation by demonstrated D3 (with an g/H, 84.96%)