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To improve the efficiency of decomposition of dye wastewater, the experiments of sonocatalytic degradation of Acid Orange 7 by TiO 2 -based films with doping Co, N and Er 3+ : Y 3 Al 5 O 12  were performed in this paper. Based on analysis of the change of concentrations of the samples over time, the result showed that sonocatalytic degradation of Acid Orange 7 by TiO 2 -based films agreed with the pseudo-first-order kinetics. The effect of doping mass fraction of Er 3+ :Y 3 Al 5 O 12 , Co and N inTiO 2 -based films and reaction temperature on degradation rates were studied. The optimal doping mass fraction of Er 3+ : Y 3 Al 5 O 12 , Co and N were 1.81 %, 2.01 %, and 12.03 % respectively at 20 °C. The model of the reaction rate constants of sonocatalytic degradation of Acid Orange 7 by Co/N/Er 3+ : Y 3 Al 5 O 12 /TiO 2  films were fitted. The errors between the model values and the experimental results were all less than 15 %. So the models could be used to estimate the degradation rate and concentration of Acid Orange 7 and provide theoretical basis for the design of catalytic reaction.

Kinetics analysis of photocatalytic degradation of Acid Orange 7 by Co/N/Er 3+ : Y 3 Al 5 O 12 /TiO 2 films