Loading Titanium Dioxide on Bionic Substrate for Photocatalytic Reduction of Carbon Dioxide

• Main Authors: WU, WEI-CHIEN, 吳瑋騫
• Other Authors: TSENG, I-HSIANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/mx7f4t

碩士 === 逢甲大學 === 化學工程學系 === 107 === In this work, two-dimensional materials such as Camellia sinensis were used to enhance the photocatalytic activity of titanium dioxide under visible light irradiation. The properties of photocatalyst were discussed and correlated to the characteristics of photocatalytic reduction of carbon dioxide. Two-dimensional titanium dioxide/bionic substrate was fabricated by using Camellia sinensis as template and adding titanium (IV) n-butoxide as the precursor of TiO2. Titanium dioxide/bionic substrate was obtained by combining sol-gel and solvothermal (180℃) processes, in situ growth of TiO2 on bionic substrate was achieved after further calcination method (500℃). The two-dimensional bionic substrate benefits the uniform growth of TiO2 on bionic substrate, prevents agglomeration of TiO2 nanoparticles and increases the specific surface area of samples. SEM images confirmed the morphology of TiO2 and bionic substrate. ESCA results confirmed the formation of Ti-O-N bonds between TiO2 and bionic substrate indicating the improved interaction between two phases. UV-vis spectra showed that a significant red shift of the absorption of the edge occurred on samples containing bionic substrate contents. The PL spectra analysis showed that the presence of bionic substrate outstandingly reduced its PL intensity, suggesting the increase of charge transfer and the prohibition of electron-hole recombination by bionic substrate. The results of photocatalytic reduction of CO2 showed that the Ac-t-TL-g-Ti photocatalyst can convert CO2 into CO in the presence of EtOH under the visible light (LED) illumination. This sample produced weaker PL intensity than other samples suggesting a better inhabitation of electron-hole recombination. Besides, the presence of bionic substrate made a significant red shift of the absorption of the edge. Photocatalytic reduction of CO2 showed Ac-t-TL-g-Ti could successfully convert CO2 into CO and the yield of CO was 1.409 μmol/gcat.