| Summary: | 碩士 === 大同大學 === 化學工程學系(所) === 101 === The photocatalyst Bi1.5Zn1-xCuxTa1.5O7is prepared by the flux method by mixing
the different proportions of Ta2O5、Bi2O3、ZnO and CuO and adding K2SO4 and
Na2SO4 flux to raise to the required preparation temperature. With the temperature elevating rate of 10C/min, and maintaining for 1 hour natural cooling to the room temperature, the powder of photocatalysts Bi1.5Zn1-xCuxTa1.5O7were obtained after washing with the distilled water and drying. All the prepared catalysts became Bi1.5Zn1-xCuxTa1.5O7photocatalysts. The photocatalystic characterization of prepared photocatalyst was investigated with the X-ray diffraction (XRD), UV - Visible Spectrometer (UV-Vis), Energy Dispersed Spectrometer (EDS),and Scanning Electron Microscope (SEM). From the XRD results,it could be known that the BiTa0.98Cu0.02O4 photocatalysts possess the best crystalline structure under 500 0C calcination,and with the increase of x in Bi1.5Zn1-xCuxTa1.5O7 photocatalysts, the diffraction peaks shift more to the wide-angle.From the UV-Vis results, it could be known that with the increase of x in Bi1.5Zn1-xCuxTa1.5O7 photocatalysts, the absorption band edges showed obvious red shift. From the EDS results, it could be known that the composition of the prepared photocatalysts was identified as Bi1.5Zn1-xCuxTa1.5O7. From the SEM results, it could be known that the particles of photocatalysts become more complete, while prepared under 5000C calcination. The water-splitting reaction with the Bi1.5Zn1-xCuxTa1.5O7 photocatalysts for hydrogen production was carried out in a batch reaction with the addition of the sacrificial reagent CH4 under the irradiation of 250W Visible lamp.
From the experimental results, the highest photocatalystic reactivity for the watersplitting reaction was obtained by the Bi1.5Zn0.98Cu0.02Ta1.5O7 photocatalyst, which was prepared at 5000C calcination having the highest hydrogen evolution rate of 57μmole/h.
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