摘要
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2hLED(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,2h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.
The ZiO2 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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第1期78-82,共5页
The Chinese Journal of Process Engineering
基金
教育部新世纪优秀人才支持计划基金资助项目(编号:NCET04-0790)
985二期“环境与污染控制技术创新平台”基金资助项目
关键词
聚合物
敏化
可见光
罗丹明B
polymer
photosensitization
visible light
Rhodamine B
