CoMn@AC活化过一硫酸氢盐降解水中罗丹明B

通过浸渍合成复合催化材料CoMn@AC,用于催化过一硫酸氢盐(PMS)产生自由基对罗丹明B(RhB)进行降解。采用扫描电子显微镜(SEM)、比表面及孔径分析仪(BET)等对其进行表征。考察了催化剂负载量、PMS投加量、pH以及温度等因素对RhB降解的影响。结果表明:当Co负载量为7%且n(Co)∶n(Mn)为5∶1时,合成的复合材料CoMn@AC7-5∶1对100 mL浓度为50 mg/L的RhB降解效果可达到84.2%;在pH为4~10,反应温度为25 ℃,PMS浓度为0.250 mmol/L时,4 h内对RhB的去除率可达84.2%;猝灭研究表明,硫酸根自由基(SO-₄·)在反应过程中起主要作用;此外,CoMn@AC/PMS体系对RhB的降解效率随温度的升高而显著加快,其降解活化能为29.80 kJ/mol。

DEGRADATION OF RHODAMINE B IN WATER BY PMS ACTIVATED BY CoMn@AC

With Rhodamine B as the target pollutant, the composite catalytic material CoMn@AC was used to catalyze potassium monopersulfate (PMS) to generate SO-₄· for the degradation of Rhodamine B (RhB). Then the composite material was characterized by scanning electron microscopy (SEM), specific surface and aperture analyzer(BET) and other means. The effects of catalyst loading, PMS dosage, pH and reaction temperature on the RhB degradation efficiency were investigated. The results showed that when the RhB at a concentration of 50 mg/L in 100 mL, the Co loading was 7% and the cobalt-manganese ion molar ratio was 5∶1, the composite material CoMn@AC7-5∶1 had better degradation efficiency; when the pH was in the range of 4~10, the reaction temperature was 25 ℃, and the PMS concentration was 0.250 mmol/L, the target pollutant could be removed effectively. In addition, the degradation of RhB by the CoMn@AC/PMS system accelerated significantly with the increase of temperature, and its degradation activation energy was 29.80 kJ/mol.