【摘要】 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6 g/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100 mg/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150 min,酸性绿B色度去除率达到91.4%。更多还原

【Abstract】 The degradation of azo dye acid green B in aqueous solution was studied by low-frequency ultrasound 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 lowfrequency 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.更多还原