MnFe_(2)O_(4)-还原氧化石墨烯活化过硫酸氢钾降解罗丹明B

Activation of Peroxymonosulfate by MnFe_(2)O_(4)-Reduced Graphene Oxide for Rhodamine B Degradation

通过制备MnFe_(2)O_(4)-还原氧化石墨烯(RGO)复合活性剂,活化过硫酸氢钾降解罗丹明B(RhB).考察了pH、温度、过硫酸氢钾浓度、MnFe_(2)O_(4)-RGO投加量等要素对降解效率的影响规律.结果表明:RGO掺杂质量分数为7%的MnFe_(2)O_(4)-RGO催化剂在25℃、pH=7、n(RhB)∶n(KHSO_(5))=1∶15、MnFe_(2)O_(4)-RGO的投加量为0.25 g/L的条件下对RhB的降解率达95%,降解反应活化能为30.39 kJ/mol.MnFe_(2)O_(4)-RGO降解效果远高于单独MnFe_(2)O_(4),这是由于RGO促进了MnFe_(2)O_(4)的分散,并为降解RhB提供了更多的反应活性位点.MnFe_(2)O_(4)-RGO重复使用5次后对RhB的降解率仍能保持在90%以上.

Rhodamine B(RhB)was degraded by activating potassium bisulfate by preparing MnFe_(2)O_(4)reducing graphene oxide(RGO)composite activator.The effect of pH,temperature,potassium peroxymonosulfate content and MnFe_(2)O_(4)-RGO dosage on the degradation efficiency was investigated by preparing MnFe_(2)O_(4)-reduced graphene oxide(RGO)composite surfactant and activating potassium persulfate to degrade rhodin B(RhB).The results showed that the optimal reaction conditions of MnFe_(2)O_(4)-RGO catalyst with RGO doping mass fraction of 7%were as follows:when pH=7,temperature 25℃,n(RhB)∶n(KHSO_(5))=1∶15,the decolorization rate of RhB solution reached 95%and the activation energy of the degradation reaction was 30.39 kJ/mol.The degradation effect of MnFe_(2)O_(4)-RGO was much higher than that of MnFe_(2)O_(4)alone,probably because RGO promoted the dispersion of MnFe_(2)O_(4)and provided more reactive sites for RhB.The degradation rate of RhB by MnFe_(2)O_(4)-RGO still be maintained above 90%after 5 times of repeated use.