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, specific surface area analysis, X-ray diffraction, UV-Vis absorption spectroscopy, photoluminescence and Fourier transform infrared spectrometry, respectively. The results indicate that the surface morphology, specific 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.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2013年第4期451-457,466,共8页
Journal of The Chinese Ceramic Society
基金
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)
关键词
聚吡咯
胶原纤维
二氧化钛
介孔材料
孔雀石绿
polypyrrole
collagen fiber
titanium oxide
mesoporous material
malachite green
