利用静电纺丝技术并通过一体式同轴喷头制备了TiO₂空心纳米纤维，通过调整前驱体溶液中聚乙烯吡咯烷酮（PVP）的浓度制备了TiO₂纳米纤维和纳米带；研究这3种形貌的TiO₂纳米材料对甲基橙的光催化降解效果。结果表明，由于TiO₂纳米带比表面积最大，其光催化降解效果最好；这3种材料经5次光催化循环后光催化能力有所下降，但下降幅度不大，说明3种材料的可循环利用性好。

TiO₂ hollow nanofiber is prepared through electrospinning technology by using an integrated coaxial nozzle, and TiO₂ nanofiber and nanobelt are prepared through adjusting the concentration of polyvinylpyrrolidone (PVP) in the precursor solution.The photocatalytic degradation effect of these three kinds of TiO₂ nanomaterials on methyl orange is studied.It is found that TiO₂ nanobelt exhibits the best photocatalytic degradation effect because of its largest specific surface area.After five photocatalytic cycles, the photocatalytic ability of these three materials decreases slightly, but the decrease rate is not significant, indicating good recyclability.