| The Ru-Cu-Ce composite catalysts were prepared by using RuO2 and CuO as active components and auxiliary active components, adding CeO2 as an auxiliary agent, and supporting on the molecular sieve by a nitrate impregnation method. The catalysts were characterized by specific surface analyzer (BET), X-ray diffraction (XRD), and transmission electron microscope (TEM). Static experiments were performed to evaluate the catalytic performance of oxidative removal of ammonia nitrogen. The results showed that the additions of Cu and Ce could improve the performance of Ru catalyst, and that Ce could suppress the dissolution loss of Cu. The best preparation conditions for the catalysts were calcined at 300℃ for 4.5 h. For 200 mL simulated ammonia nitrogen wastewater with an initial concentration of 205.8 mg/L, the optimal conditions for the oxidative degradation of the 0.25% Ru-1% Cu-1% Ce catalyst at atmospheric pressure are: initial pH=10, temperature at 80℃, 0.1 mL of 30% hydrogen peroxide. The ammonia nitrogen removal rate was up to 85.6%, and the catalyst performance had no significant reduction after reuseing 7 times. |
