Ozone catalytic oxidation capacity of Ti‐Co@Al2O3 for the treatment of biochemical tail water from the coal chemical industry

A Ti-Co@gamma-Al2 O3 composite catalyst was prepared using impregnation and sol-gel methods to degrade biochemical tail water from the coal chemical industry, and its preparation conditions (active component doping ratio, load times, and calcination temperature) were optimized through single-factor experiments. The surface properties of the Ti-Co@gamma-Al2 O3 composite catalyst and the crystal structure characteristics of the catalytically active components were characterized via scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction, and X-ray fluorescence. The effects of reaction time, initial pH, ozone aeration, and catalyst dosage on degradation performance were investigated through an experiment on the catalytic ozonation degradation of biochemical tail water. Results showed that the optimal conditions were as follows: reaction time of 30 min, pH of 8.2, ozone aeration of 30 mg/min, and catalyst dosage of 20 g/L. The total phenol and total organic carbon removal rates for biochemical tail water were 66.1% and 57.6%, respectively, in the catalytic system. The mechanism of degradation of organic pollutants by catalytic ozonation was investigated by adding tert-butanol to the catalytic ozone oxidation system. The degradation of chemical oxygen demand in biochemical tail water was caused primarily by the synergy between the Ti-Co@gamma-Al2 O3 catalyst and ozone.