芴与噻吩共聚物敏化半导体在可见光下催化降解罗丹明B

可见光照射下，芴与噻吩共聚物(PFT)敏化TiO2和ZnO具有优良的催化性能，降解罗丹明B的实验表明，PFT/TiO2的催化活性明显高于PFT/ZnO. 经过2 h LED(Light-emitting Diode)灯照射，PFT/TiO2体系中，罗丹明B完全降解为无色物质，矿化率48%；而PFT/ZnO体系中，同样条件下，2 h后还存在大量有色的罗丹明B降解中间产物，矿化率只有24.6%. 罗丹明B的降解过程分两个阶段，第一阶段最大吸收峰降低的同时，发生光谱蓝移，最终脱色生成罗丹明，第二阶段罗丹明继续降解为CO2和H2O，TOC的去除主要发生在第二阶段.

Photocatalytic Degradation of Rhodamine B Using Semiconductors Photosensitized by Poly(fluorene-co-thiophene) under Visible Light Irradiation

The TiO2 and ZnO based photocatalysts prepared by poly(fluorene-co-thiophene) (PFT) modified TiO2 and ZnO have good photocatalytic activity under visible light. The results of Rhodamine B degradation showed that the photocatalytic activity of PFT/TiO2 was much better than that of PFT/ZnO. After 2 h irradiation under LED (light-emitting diode) lamp, Rhodamine B was completely degraded to colorless product, and the mineralization rate was 48% in PFT/TiO2 system. However, in PFT/ZnO system, there were lots of colored products left under the same condition, and the mineralization rate was only 24.6%. There were two steps involved in the degradation process of Rhodamine B. Firstly, the maximum absorbance peak became lower, and simultaneously there was a hypsochromic shift in the spectra. Secondly, Rhodamine B was decolored and degraded to produce Rhodamine. In the second step, Rhodamine was mineralized to CO2 and H2O continuously and the removal of TOC (total organic carbon) mainly took place in this step.