| Summary: | 碩士 === 大同大學 === 化學工程學系(所) === 102 === In this research, 3 chemical compounds Cd(NO3)2, Zn(CH3COO)2 and SnCl4 are used as precursors, and after they are mixed separately in different proportions (x=0.01~0.09), hydrothermal method in used to prepare the photocatalyst Cd0.1SnxZn0.9-2xS; besides, the pre-wet impregnation method is utilized to carry the co-catalyst Ru so as to enhance the overall activity and the hydrogen production efficiency of the photocatalyst. After the preparation, the structures and the characteristics of the photocatalysts are analyzed by means of the X-ray diffraction analyzer (XRD), ultraviolet light-visible light spectrum analyzer (UV-Vis) and field-emmision electromicroscope (FE-SEM). At first, from the result of XRD, it is known that as x=0.01 and the preparation temperature is 160℃, the photocatalyst Cd0.1Sn0.01Zn0.88S processes the best crystalline structure; in addition, as the x value of the photocatalyst Cd0.1SnxZn0.9-2xS becomes larger, the diffraction peak angle shift to be larger. From the result of UV-Vis, it is known that as the proportions of Sn and Zn are different, the critical wavelengths are caused to shift, and with the increase of Sn content, the red transitions of the critical wavelengths are caused to produce; besides, as x=0.01, maximum critical wavelength is about 500 nm, with the energy gap of about 2.48 eV. Furthermore, from the EDS identifications, it is known separately that the actual composition of the photocatalyst is confirmed to be Cd0.1SnxZn0.9-2xS. Finally, from FE-SEM, it is known that the grain particle of photocatalyst is completely of the spherical structure, and with different preparation temperatures and Sn contents, the particle diameter sizes also change. From the experimental result, it is known that with the proportion of x=0.01, at the preparation temperature is 160℃, the photocatalyst Cd0.1Sn0.01Zn0.88S processes the best reaction activity; and as it is carried with 0.5 wt% co-catalyst of Ru, the hydrogen production rate can reach to 770 μmole/h.
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