Abstract: Used tetrabutyl titanate as material, increased the temperature to gradually degrade the ureophil to prepare the colloid TiO2, fixed the colloid TiO2 on chitin and obtained TiO2/chitin. Methyl orange solution was used as model, the photocatalytic degradation ratio with TiO2／chitin was investigated by spectrophotometer method. The results revealed that the TiO2／chitin was an efficient photocatalyst for the degradation of methyl orange, and 75.6％ of the methyl orange was degraded after 100 min using UV light,and 52.3％ of the methyl orange was degraded under the sunlight after 150 min, respectively. The TiO2／chitin could degradate methyl orange for 10 times, and the degradation ratio was from 45.1％ to 73.9％. There existed the peak belonging to the O－Ti－O band absorption at 952.8 cm－1. The TiO2／chitin has efficient ability for degradation of methyl orange.

Key words: TiO2, chitin, methyl orange, degradation, sunlight