通过聚乙烯醇（PVA）在酸性条件下的热消除反应制备了具有共轭结构的聚合物（C-PVA）,进一步有机/无机杂化制备出C-PVA/TiO2复合光催化剂。紫外-可见吸收光谱、傅里叶变换红外光谱和热失重结果表明,C-PVA含有共轭双键和羰基;X射线光电子能谱和紫外-可见漫反射光谱分析结果表明,C-PVA/TiO2复合光催化剂表面由具有一定共轭结构的聚合物和TiO2组成,且该催化剂对光的吸收由紫外光区扩展到可见光区;光催化实验结果表明,C-PVA/TiO2复合光催化剂对模型污染物罗丹明B有较强的吸附（2.5 h达吸附平衡,吸附率为20%）,在可见光下对罗丹明B的降解具有良好的催化效果（5 h降解率可达99%）。
The conjugated polymer（C-PVA） was perapared from the thermal elimination of poly（vinyl alcohol）（PVA）,and also the C-PVA/TiO2 composites were prepared from C-PVA and TiO2 sol.UV-Vis,FT-IR,TG,XPS and diffuse reflection spectrum（DRS） were used to characterize the C-PVA and the C-PVA/TiO2 composites,and also the photocatalytic degradation of Rhodamine B（RhB）.The results indicate that the thermal elimination of PVA results in conjugated polymer.The photoresponse wavelength area of C-PVA/TiO2 to the light in UV-Vis region is extended to 400 nm800 nm,whereas that of TiO2 is below 400 nm.The equilibrial absorption percentage of RhB in the presence of C-PVA/TiO2 is presented at 2.5 hours and 20%.And C-PVA/TiO2 degrades 99% RhB in 5 hours under visible light.
参考文献
| [1] | Akira Fujishima;Tata N. Rao;Donald A. Tryk .Titanium dioxide photocatalysis[J].Journal of photochemistry and photobiology, C. Photochemistry reviews,2000(1):1-21. |
| [2] | Y. F. Zhu;K. L. Pan;L. Jiang .Preparation and evaluation of photocatalytic activity of poly(dimethylsiloxane)-titanium dioxide composites[J].Plastics, Rubber and Composites,2007(7/8):360-364. |
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