采用层层组装技术制备TiO2中空纳米纤维膜催化剂

Fabrication of TiO_2 Hybrid Hollow Nanofibrous Photocatalyst by Electrostatic Layer by Layer Technique

采用静电纺丝技术和层层组装技术制备了聚电解质/TiO2复合中空纳米纤维。以电纺聚苯乙烯纤维为模板,聚电解质交替吸附在纤维表面,再用有机溶剂溶掉PS纤维模板获得多层聚电解质中空纤维。纤维的平均直径和壁厚能通过模板和吸附层数很好的得到控制。在对比P25 TiO2和TiO2中空纤维对亚甲基蓝的光催化性能实验中,发现TiO2中空纤维具有更好的光催化性能。TiO2/聚电解质复合中空纳米纤维有望应用于光催化,可控药物释放等。

Hybrid muhilayered hollow nanofibers composed by TiO2/ polyelectrolyte （PE） have been prepared by a combination of electrospinning method and Layer-By-Layer （LBL） technology. Polysty rene （PS） was electrospun into nanofibrous mats, which was employed as templates to self-assembly multilayered polyelectrolytes （PE） on the surface. Hybrid muhilayered hollow nanofibers were ob rained after the template PS were selectively removed. The results show that the average diameter of the hollow nanofibers and the wall thickness can be well controlled by the template as well as the numbers of the coating layers. When comparing with other nanostructured TiO2 materials such as commercial TiO2 nanoparticles （P25, Degussa） and TiO2 films, the hollow TiO2/PE hybrid nanofibers exhibited higher photocatatytic activities. Such hollow nanofibers have potential applications in a wide field, for example, catalysts, controlled release medicine and so on.