Analysis of the Surface Adsorbed Organics of Nanosized TiO_2 Photocatalyst with High Visible-light Photocatalysis Activity by Ultrasonic Treatment under Water and Ethanol Solution

摘要

Low frequency ultrasonic treatment was applied to desorb surface organics from the surface of nanosized TiO_2 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 TiO_2 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).