硅酸盐学报

原位复合法制备聚吡咯/介孔TiO2及光催化性能

作者：蔡莉

分类号：O614

出版年,卷(期):页码：2013,41(4):0-451

DOI：

摘要：

以胶原纤维为模板制备介孔TiO2纤维(MTF)，用吡咯(pyrrole，Py)对MTF进行静止原位复合，制备出聚吡咯/介孔TiO2复合材料(PPy/MTF)。利用扫描电子显微镜、场发射扫描电镜、比表面积分析、X射线衍射、紫外–可见吸收光谱、分子荧光光谱、红外光谱对PPy/MTF进行表征。结果表明：静止原位复合时Py与MTF的摩尔比会影响PPy/MTF的表面形貌、比表面积和孔体积。与Degussa P25相比，MTF和PPy/MTF的吸收光谱明显红移，禁带宽度有不同程度的缩小；分子荧光光谱强度明显减弱，光生电子–空穴对的复合情况得到改善。孔雀石绿的光催化降解实验表明：MTF和PPy/MTF具有比Degussa P25更强的光催化活性，其中，当PPy与MTF的摩尔比为0.005时，PPy/MTF具有最强的光催化活性，且具有良好的稳定性，能多次重复使用。

Mesoporous TiO2 fiber (MTF) was firstly prepared with collagen fiber as a template, and then a PPy/MTF composite was synthesized via unstirred in-situ polymerization on the MTF. The structure and physical properties of MTF and PPy/MTF were characterized by scanning electron microscopy, field emission scanning electron microscopy, speci?c surface area analysis, X-ray diffraction, UV–Vis absorption spectroscopy, photoluminescence and Fourier transform infrared spectrometry, respectively. The results indicate that the surface morphology, speci?c surface area and pore volume of MTF and PPy/MTF can be affected by the molar ratio of Py over the MTF. Compared to the Degussa P25, the absorbance wavelength of the as-prepared MTF and PPy/MTF was red shift and the band gap energy decreased. The PL intensity of MTF and PPy/MTF decreased, indicating that they had a low recombination rate of photo-induced electrons and holes. The photocatalytic activity of the as-prepared MTF and PPy/MTF was greater than that of the Degussa P25. When the mole ratio of PPy/MTF is 0.005, the PPy/MTF had an excellent long-term stability and could be multiple-used.

基金项目：

国家自然科学基金(20776090)；四川省教育厅面上项目(11ZB074)；四川师范大学大型精密贵重仪器设备开放共享专项基金(DJ2012-01)。

作者简介：

蔡莉(1977—)，女，博士，副教授

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