Synthesis And Studies On The Photocatalyst Of Copper Base Composites

In order to further broaden the kinds of photocatalysts,to solve the problems such as high photoproduction carrier recombination rate，low utilization rate of light energy and poor photocatalytic performance,so that,this paper choosed P-type semiconductor material copper oxide as the main research object.Under different preparation conditions,composite photocatalysts were fabricated by different methods,such as heavy metal doping, semiconductor compounds.X-ray diffraction(XRD),scanning electron microscopy(SEM),and ultraviolet visible diffuse reflectance absorption spectra(UV-Vis DRS)were employed to characterize the as-synthesized samples.The Specific research contents are as follows:(1)With Cu(NO3)2, DMF and NaOH as raw materials, Cu/CuO/Cu2O composite photocatalysts were successfully fabricated by hydrothermal method. The results demonstrated that:the hydrothermal response process can be changed by adjusting hydrothermal temperature and time, as the temperature increases, the time extension, the sample compositions were gradually reduced from high valence to low. The highest photocatalytic activity of the as-obtained Cu/Cu0/Cu20can be achieved when the hydrothermal temperature is165℃,pH is12and the hydrothermal time is12h,the degradation rate was72%.(2)CuO/ZnO composite photocatalysts were synthesized via pyrolysis method. The results showed that:the main constituents of composite photocatalyst were Cu2O、CuO、ZnO, and no other phase created. ZnO was lamellar structure, CuO was accumulated as flowers.and both can be mixed uniformly. Within the scope of the test, the highest photocatalytic activity of the as-obtained CuO/ZnO can be achieved when the calcining temperature is400℃,Cu source,Zn source molar ratio is2:1,and calcining time is3h,the degradation rate was92%.(3) With CuSO4and SnCl4as raw materials,NaOH as fluxing agent,CuO/SnO2composite photocatalysts were synthesized via molten salt method. The results demonstrated that:crystalline phase was influenced by the kinds of fluxing agent. Composite materials comprise CuO, SnO2, no other phase created. Within the scope of the test, the highest photocatalytic activity of the as-obtained CuO/SnO2can be synthesized when the fluxing agent is NaOH.the temperature is600℃,Cu source,Sn source molar ratio is2:1,and the time is 1h,the degradation rate was72%.(4) With CuSO4·5H2O and Zn as raw materials, Cu-ZnO composite photocatalysts were synthesized via high temperature vapor oxidization method. The results demonstrated that: The smooth surface of the samples lead to poor adsorption performance. UV-Vis spectra appeared red shift, thus we can infer copper has been added into it. Within the scope of the test, the highest photocatalytic activity of the as-obtained CuO/ZnO can be synthesized when the doping content is0.1%.