School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, PR China.
J Hazard Mater. 2010 Feb 15;174(1-3):129-36. doi: 10.1016/j.jhazmat.2009.09.026. Epub 2009 Sep 12.
TiO(2) continuous fibers were prepared by a sol-gel method combined with centrifugal spinning without any template or binder polymer. The fibers were characterized using XRD, FT-IR, SEM, N(2) adsorption-desorption, and UV-vis DRS. The addition of silica was a crucial factor for obtaining long fibers because of the formation of Ti-O-Si networks. The effects of dopant contents and heat treatment temperatures were studied. It was found that the proper addition of silica into titania could improve the surface texture and enhance the thermal stability and crystal stability. When Si/Ti molar ratio was 0.15, mesoporous TiO(2) fibers with a BET surface area up to 127.7 m(2)g(-1) were obtained after heat treatment at 700 degrees C. It displayed the highest photoactivity of all, and the degradation rate of X-3B in aqueous solution reached 99.6% after 75 min under UV irradiation. Furthermore, the degradation rate and the mineralization rate of X-3B were 94.7% and 58.9% after 3h under solar irradiation, respectively. In addition, it was worthwhile to mention that the degradation efficiency was also more than 90% after 6 cycles.
TiO(2)连续纤维采用溶胶-凝胶法结合离心纺丝制备，无需任何模板或粘结剂聚合物。采用 XRD、FT-IR、SEM、N(2)吸附-脱附、UV-vis DRS 对纤维进行了表征。添加二氧化硅是获得长纤维的关键因素，因为形成了 Ti-O-Si 网络。研究了掺杂含量和热处理温度的影响。结果表明，适量添加二氧化硅可以改善 TiO(2)的表面形貌，提高热稳定性和结晶稳定性。当 Si/Ti 摩尔比为 0.15 时，在 700℃热处理后，可得到比表面积高达 127.7 m(2)g(-1)的介孔 TiO(2)纤维。在紫外光照射下，75 min 后 X-3B 的降解率达到 99.6%，显示出最高的光催化活性。此外，在太阳光照射下 3 h 后，X-3B 的降解率和矿化率分别达到 94.7%和 58.9%。此外，值得一提的是，经过 6 次循环后，降解效率仍超过 90%。
