Structural Modification of Cs0.7Ti1.825O4 and Cs0.8Fe0.8Ti1.2O4: Preparation of Porous Photocatalytic Materials

• Main Author: 賴國斌
• Other Authors: 廖儒修
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/82749911034881575642

碩士 === 國立中正大學 === 化學研究所 === 88 === In this thesis, the layered compounds, Cs0.7Ti1.825O4 and Cs0.8Fe0.8Ti1.2O4, are modified in order to enlarge the surface area and to enhance the ability of photocatalysis. The d-spacings of the compounds increase to 2.0~4.0nm by intercalating different lengths of alkyl amines (CnH2n+1NH2, n=4~18). These products were put into the solution containing TEOS (Si(OEt)4) or APS (NH2(CH2)3Si(OEt)3) so that TEOS or APS can be intercalated in the interlayered space. After the interlayered organic species decompose under high temperature, layered products pillared with SiO2 can be formed. BET measurements indicates surface as high as 770 m2/g can be obtained. The exfoliation of titanate sheets was carried out in aqueous tetrabutylammonium hydroxide (TBAOH) solution at room temperature. Photocatalytic activities of Degussa P-25 TiO2, exfoliated H0.7Ti1.825O4 and SiO2-intercalated (A14H)xH0.7-xTi1.825O4 were demonstrated for a degradation reaction of aqueous orange II. Exfoliated H0.7Ti1.825O4 was found to be a promising photocatalyst to decompose organic species.