Study On The Synthesis And Catalytic Performance Of Cu₂O-CuO/ZSM-5 And CuO/Ni For Azo Dye

Water pollution by persistent and nonbiodegradable organic substances such as dyes brings very serious threats to the living species on the earth. The enormous diversity of pollutants makes it impossible to use conventional treatment methods for water decontamination and leads to the development of specific methods for it. The methods include adsorption tactics, biological degradations, photocatalysis, and so on.In this study, Cu2O-CuO/ZSM-5 nano-composite with different Cu mass loading were synthesized by impregnation method and Cu synthesized was on nickel foam by hydrothermal method (Cu/Ni). The Cu/Ni was heated in static air for growing CuO nanowires (CuO/Ni). The catalytic performance of Cu2O-CuO/ZSM-5 nano-composite and CuO/Ni for destruction of AO7 in aqueous solutions were investigated.Cu2O-CuO/ZSM-5 nano-composite was chatacterized by TEM, XRD and XPS. The effects of Cu mass loading, catalyst dosage, pH of AO7 aqueous solutions, concentration of AO7, temperature of reaction for Cu2O-CuO/ZSM-5 nano-composite degraded AO7 were studied, and the cycle performance of Cu2O-CuO/ZSM-5 nano-composite was also investigated. Ultravioletvisible spectrophotometer, fourier infrared spectrometer and mass spectrometer were used to chatacterize the AO7 aqueous solutions which degraded by Cu2O-CuO/ZSM-5 nano-composite. Cu2O-CuO/ZSM-5 nano-composite exhibited a good catalytic activity for AO7 when the pH of AO7 aqueous solutions range from 4.0 to 10.0 (degradation efficiency exceed 85%) and a stable catalytic activity after three successive runs (degradation efficiency exceed 86%). The excessive temperature (exceed 40℃) could reduce the adsorption of ZSM-5 for AO7, which leaded to the catalytic activity of Cu2O-CuO/ZSM-5 decline. The chromophore of AO7 could be destructed by Cu2O-CuO/ZSM-5 effectly, and so was to aromatic nucleus of AO7.Cu/Ni was chatacterized by SEM and XRD, a layer of Cu which was pyknotic and rough formed on nickel foam. Through controlling the dosage of citric acid could adjust formation of Cu on nickel foam effectly, and the thickness of the Cu film could be adjusted by controlling the time and temperature of the reaction. CuO/Ni was chatacterized by SEM and XRD, CuO nanowires with a length up to 13μm grow perpendicularly aligned on the nickel foam. The time and temperature of calcinations together with the heating rate were very important for the formation of CuO nanowires. CuO/Ni exhibited a good catalytic activity for destruction of AO7 in visible light when the pH value of AO7 aqueous solutions less than 7.0.