多孔TiO2薄膜在PET纤维上的负载及其光催化性能

 采用浸渍法将低温制备的TiO2溶胶在普通和碱减量PET纤维上负载成膜，并以聚苯乙烯（PS）微球为模板剂使TiO2膜多孔化，制备了一系列TiO2/PET光催化纤维。采用XRD、SEM对TiO2和纤维进行了表征，并通过对甲基橙的降解来考察其光催化性能。结果表明：溶胶经室温陈化后可得到具有较高光催化活性的纳米锐钛矿型TiO2。PET纤维上TiO2的负载率随着溶胶在浸渍液中的含量增加而增大。PET纤维的碱减量有利于TiO2的负载和光催化活性的提高，且随着TiO2负载率的增加，甲基橙降解率具有先增加后缓慢减小的趋势。当碱减量纤维的TiO2负载率为4.2%时，光催化活性最好。利用PS为模板剂使TiO2薄膜多孔化可以进一步提高光催化纤维的比表面积和吸附能力，从而提高光催化活性。

Loading of porous TiO2 film on PET fiber and its photocatalytic capability

The low temperature TiO2 sol with polystyrene (PS) microspheres as template for porous structure was coated on raw and alkali deweighting PET fibers by impregnation, and a series of photocatalytic TiO2/PET fibers were prepared. The TiO2 and fibers were characterized by XRD and SEM. The photocatalytic performance of TiO2/PET fibers was evaluated through degradation of methyl orange. The results indicated that nanometer anatase TiO2 with high photocatalytic activity was obtained after the sol aging. The TiO2 loading on PET fiber surface increased with the increasing proportion of TiO2 sol in impregnating solution. The alkali deweighting of PET fibers contributed to improving TiO2 loading and photocatalytic activity. With TiO2 loading rate increasing, the degradation rate of methyl orange increased from the beginning and then decreased slowly. The TiO2/PET fiber showed best photocatalytic activity with the loading rate of 4.2%. Porous TiO2 film due to PS as template can further enhance the specific surface area and the adsorption ability of photocatalytic fiber, so as to improve the photocatalytic activity.