低频超声协同Fe-Ni-Mn／Al2O3催化降解酸性绿B的研究

采用低频超声与Fe-Ni-Mn／Al2O3催化剂协同降解偶氮染料酸性绿B模拟废水，考察染料初始浓度和pH值、催化剂、饱和气体及H2O2等因素对酸性绿B降解效果的影响，结果表明：催化剂Fe-Ni-Mn／Al2O3与低频超声存在协同效应，催化剂的最佳投加量为6g／L；酸性条件有利于染料的超声降解，当pH=3．8时，可取得最佳的降解效果；酸性绿B降解率随初始浓度的增大而降低，其优化初始浓度为100mg／L，此外，在反应体系中鼓入饱和气体也可促进酸性B的降解，且影响顺序为混合气体（air＋Ar）〉氧气〉氩气；在反应过程中投加H2O2有利于染料降解率的提高。在优化实验条件下降解150min，酸性绿B色度去除率达到91．4％。

Degradation of acid green B by low-frequency ultrasound synergized with Fe-Ni-Mn/Al2O3

The degradation of azo dye acid green B in aqueous solution was studied by low-frequency ultra- sound in the presence of catalyst Fe-Ni-Mn/Al2O3. The effects of initial concentration and pH value of dyestuff solution, catalyst, saturated gas and H2O2 on degradation of acid green B were investigated. The results show that catalyst Fe-Ni-Mn/Al2O3 is favorable for degradation of acid green B and there exist synergetic effects in Fe-Ni-Mn/Al2O3 catalyst combined with low-frequency ultrasonic irradiation. The optimal dosage of catalyst Fe-Ni-Mn/Al2O3 is 6 g/L. The degradation rate of acid green B is highly dependent on pH value and acidic condition helps to promote the degradation of acid green B. The optimum degradation rate of acid green B can be achieved when pH value is 3.8. However, the degradation rate decreases with the increase of dye initial concentration and optimal concentration is 100 mg/L. Moreover, degradation rate of acid green B is enhanced significantly in the presence of saturated gases used in this study. The favorable effects on degradation of acid green are listed in the following decreasing order： mixed gas （air ＋ argon） 〉 oxygen 〉 argon. Dosage of H2O2 to the reaction system is proved to be beneficial to the degradation of acid green B. 91.4% of colourity removal rate of acid green B can be achieved under the optimal experimental conditions.