TiO_2薄膜光催化氧化I^-的研究

A STUDY ON PHOTOCATALYTIC OXIDATION OF I^-OVER A TiO_2 THIN FILM

采用溶胶 凝胶法 ,在玻璃珠表面涂覆均匀透明的TiO2 薄膜并制成光催化反应器 ,对水溶液中I- 的光催化氧化进行了研究 .比较了光催化剂的活性 ,讨论了I- 的起始浓度、试液的酸度、光照时间与I2 产率的关系 .实验结果表明 :采用锐钛型TiO2 作光催化剂 ( 3L碘化钾溶液所用催化剂量为 4 0 g) ,当 [I- ]=0 .3mol/L ,[H+ ] =3.0mol/L ,光照 8h时 ,I2 的产率达到 4 1 2 6% .

Photocatalytic oxidation of I - in aqueous solution was studied in a photocatalytic reactor, in which the surface of the glass beads was covered with evenly transparent TiO 2 thin film by sol gel process. It is observed that the yield of I 2 formation is dependent on the crystal structure of the catalyst, the illumination time, the initial concentrations of I - and H +. The results show that the yield of I 2 can reach 41.26% over anatase TiO 2 coated film, with photocatalyst (4.0 g) in the solution of KI (3 L), of 0.3 mol/L, of 3.0 mol/L and illumination time of 8 h.