碩士 / 國立高雄應用科技大學 / 化學工程與材料工程系博碩士班 / 101 / In this study, various methods including indirect and direct deposition and ionic exchange with/without bifunctional linker (MPA) were developed to prepare CdS quantum dots / nitrogen-doped mesoporous titania during evaporation-induced-self-assembly (EISA) process. A variety of different spectroscopic and analytical techniques, such as small- and wide-angle powder X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) analysis, Raman scattering spectroscopy (Raman), small angle X-ray scattering (SAXS), UV-visible spectroscopic (UV-vis), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were used to characterize the physicochemical properties of various materials. Photocatalytic splitting of water by the synthetic photocatalysts under visible light was also examined in this study.
Among all CdS quantum dots / nitrogen-doped mesoporous titania, it the SAXS and BET results indicated that the photocatalysts prepared via ion-exchange method had the better mesoporous structure with highest specific surface areas of 69.4 m2/g. It was also found the more CdS quantum dots were deposited would lead to the decreased specific surface areas. It was observed that UV-visible reflectance spectra suggested that red shifted to the visible region (approximately 500 nm) upon the deposition of CdS quantum dots onto nitrogen-doped mesoporous titania. Among all the prepared photocatalysts under visible-light photocatalytic splitting of water, the photocatalysts fabricated by ion-exchange method had the highest amount of hydrogen production. This result showed that the mesoporous structure of photocatalysts with high specific surface areas and optimum CdS quantum dots would be favorable for photocatalytic evolution of hydrogen under visible light irradiation.
| Identifer | oai:union.ndltd.org:TW/101KUAS0063032 |
| Date | January 2013 |
| Creators | Wu, Chung-Yi, 吳重儀 |
| Contributors | Liu, Shou-Heng, 劉守恒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 223 |
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