Analysis of the Surface Adsorbed Organics of Nanosized TiO2 Photocatalyst with High Visible-Light Photocatalysis Activity by Ultrasonic Treatment under Water and Ethanol Solution
Low frequency ultrasonic treatment was applied to desorb surface organics from the surface of nanosized TiO2 photocatalyst, which was prepared by hydrothermal method using a mixture of different amounts of Ti(OBu)4, ethanol, acetone and pyridine raw materials. The UV-Vis, TG-DTA and GC-MS analysis were used to investigate the surface organics. It was found that the absorption intensity around 250nm in UV-Vis spectra of the upper transparent solution, which represents the amount of organics desorbed from the TiO2 surface, increased with increasing treatment time. Along with the TG-DTA and GC-MS analysis, the kinds and amounts of partial surface organics were roughly clarified, and these organics may correspond with the photocatalytic degradation rate for methyl orange (MO) solution under visible light irradiation (≥450nm).
Wei Pan and Jianghong Gong
G. Q. Chen and Z. L. Hong, "Analysis of the Surface Adsorbed Organics of Nanosized TiO2 Photocatalyst with High Visible-Light Photocatalysis Activity by Ultrasonic Treatment under Water and Ethanol Solution", Key Engineering Materials, Vols. 336-338, pp. 2304-2307, 2007