Preperation Of Copper-supportde Catalist And Its Catalytic Performance Cooperating With PMS For Degration Of Rhodamine B

Advanced Oxidation Technologies based on sulfate radicals have been widelystudied at home and abroad in recent years. Sulfate radicals have stronger oxidationcapacity than hydroxyl radicals under certain conditions, overcoming someshortcomings such as the limited pH range and degree of mineralization. At present,most of this research are focused on Co/PMS system, however, cobalt dissolution isinevitable regardless of homogeneous or heterogeneous Co/PMS system, it is knownthat cobalt has a strong biological toxicity, even small amounts of cobalt ions will causea potential threat to the environment and humans, and because of high price andreserves limitations of cobalt metal, researchers have begun to choose other transitionmetal to catalyze PMS producing sulfate radicals for degradation of organiccontaminants.In this study, copper-containing catalyst was prepared by impregnation of copperoxide on ZSM5zeolite and activated carbon, and was applied to a polycyclic dyeRhodamine B treatment with PMS. The decolorization effects of Rhodamine B wereinvestigated in heterogeneous Cu/ZSM5/PMS and Cu/AC/PMS system. Meanwhile, thepreparation conditions and reaction conditions of reaction system on the decolorizationeffects were discussed respectively,and the stability of the catalyst was also studied.Cu/ZSM5catalyst was prepared by incipient wetness impregnation andcharacterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) andspecific surface area (BET).We firstly introduced the Cu/ZSM5to the reaction system inpresence of PMS to remove the Rhodamine B, the decolorization efficiency ofRhodamine B was97.05%in60min, which showed that Cu/ZSM5had a good catalyticperformance. Further optimizing the preparation conditions and reaction conditions, wefinally chose the load of10%, calcination temperature300?, calcination time6h as thebest preparation conditions, and the recommended conditions of reaction were as follow:at room temperature, pH was7, the concentration of rhodamine B was50mg/L, PMSwas0.6g/L and Cu/ZSM5was1.0g/L, the decolorization efficiency was96.84%andthe amount of copper dissolution was0.256mg/L in60min, accounting for0.256%ofthe amount of active ingredient.Cu/AC catalyst was prepared by incipient wetness impregnation and characterizedby X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM)and specific surfacearea (BET).We firstly introduced the Cu/AC to the reaction system in presence of PMSto remove the rhodamine B, the decolorization efficiency of Rhodamine B was99.8%in30min, which showed that Cu/AC had a good catalytic performance. Further optimizing the preparation conditions and reaction conditions, we finally chose the loadof10%, calcination temperature400?, calcination time4h as the best preparationconditions, and the recommended conditions of reaction were as follows: at roomtemperature, pH was7, the concentration of Rhodamine B was50mg/L, PMS was0.9g/L and Cu/AC was0.2g/L, the decolorization efficiency was98.2%and the amount ofcopper dissolution was0.089mg/L in30min, accounting for0.445%of the amount ofactive ingredient.The reusability of two different catalysts for Rhodamine B degradation had beeninvestigated. The catalysts were reused for four times. The decolorization efficiency ofRhodamine B was still maintained above95%and96%respectively, which showed thetwo catalysts had good reuse properties.