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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%。
A series of polythiophene sensitized TiO2 (PTh / TiO2) composites with different molar ratios of thiophene and TiO2 [n (Th) / n (TiO2)] were prepared by in situ oxidation polymerization in CHCl3 using anhydrous FeCl3 as oxidant . The composites were characterized by TEM, FTIR, XRD, DRS and PL. The photocatalytic activity of the composite under ultraviolet light and sunlight was studied by photocatalytic degradation of phenol. The results showed that PTh modification reduced the agglomeration between the composite nanoparticles, but had no effect on the crystal structure of the TiO2 nanoparticles. The composite particle size was 25-30 nm. Sensitization of PTh allows the composite to absorb light at 200-800 nm. Under the two light sources, the photocatalytic activity of the composite was better than that of the pure TiO2, and the best was obtained when n (Th) / n (TiO2) = 0.04. The degradation rate of phenol was 76.39% under UV light at 200min. The degradation rate of phenol was 88.27% at 120min in sunlight, which was 19.7% and 31.53% higher than pure TiO2 respectively.