聚噻吩敏化TiO_2复合材料的制备和光催化性能

以无水FeCl3为氧化剂,在CHCl3中采用原位氧化聚合法制备了一系列不同噻吩与TiO2摩尔比〔n(Th)/n(TiO2)〕的聚噻吩敏化TiO2(PTh/TiO2)复合材料。用TEM、FTIR、XRD、DRS和PL对复合材料进行了表征。用苯酚的光催化降解反应研究了复合材料在紫外光和太阳光下的光催化活性。结果表明,PTh的修饰减轻了复合纳米粒子之间的团聚,但对TiO2的晶体结构无影响,复合材料粒径25～30nm。PTh的敏化作用可使复合材料吸收200～800nm的光。两种光源下,复合材料的光催化活性均优于纯TiO2,当n(Th)/n(TiO2)=0.04时达最佳。紫外光下,200min时苯酚降解率达76.39%,太阳光下,120min时苯酚降解率达88.27%,较纯TiO2光催化活性分别提高了19.7%和31.53%。

Preparation and Photocatalytic Properties of Polythiophene Sensitized TiO_2 Composite Materials

Polythiophene sensitized TiO_2(PTh/TiO_2) composite materials with different n(Th)/n(TiO_2) were synthesized by the in situ chemical oxidation polymerization using FeCl_3 as an oxidant in CHCl_3.TEM,FTIR,XRD,DRS and PL were used to characterize the composite materials and their photocatalytic activities were investigated by degrading phenol under UV and solar light irradiation.Results showed that the modification of PTh could reduce the aggregation of composite nanoparticles and had no influence on the crystalline structure of TiO_2.The particle size was in the range of 25～30 nm.After being sensitized by PTh,the composites could absorb the light from 200 nm to 800 nm.Under UV and solar light irradiation,the photocatalytic activity of all these composite photocatalysts is higher than that of neat TiO_2.The optimum activity was obtained when n(Th)/n(TiO_2) was 0.04.The degradation rate of phenol is 76.39% under UV light after 200 min and the degradation rate is 88.27% under solar light after 120 min.The degradation rates of phenol are 19.7% and 31.53%,higher than the activity of neat TiO_2.