静电纺丝法大面积制备TiO_2纤维及其光催化降解水中亚甲基蓝的研究

LARGE-SCALE FABRICATION OF TiO_2 FIBERS BY ELECTROSPINNING AND ITS PHOTOCATALYTIC ACTIVITY IN DEGRADING METHYLENE BLUE IN WATER

本文利用静电纺丝法制备了不同直径的聚乙烯吡咯烷酮(PVP)/钛酸正丁酯(TBT)复合纤维,经过高温煅烧获得了不同直径的TiO2纤维。通过场发射扫描电镜(FESEM)、X-射线(XRD)、红外光谱(FTIR)对所制备的纤维进行了表征。以有机染料亚甲基蓝(MB)作为废水模型,研究了不同直径TiO2纤维的光催化性能。结果显示:静电纺丝方法适合于大面积制备不同直径的TiO2纤维并且所制备的纤维具有良好的光催化性能,亚甲基蓝在100min内的降解率最高可达96.5%。降解动力学研究显示反应符合一级反应动力学方程。同时分离沉降和重复利用实验表明静电纺丝方法制备的TiO2纤维具有易于分离,重复使用性能好的优点。

Different diameters of polyvinyl pyrrolidone （PVP）/tetraburyl titanate （TBT） composite fibers were prepared by electro- spinning technique. After calcination different diameter TiO2 fibers were obtained. As - prepared fibers were characterized by field e- mission scanning electron microscopy （ FESEM）, X - ray diffraction （XRD）, Fourier transform infrared spectrum （FTIR）. Photocata- lytic activity of the TiO2 fibers were studied by photocatalytic degradation of Methylene Blue （MB） in water. The experimental results show different diameter TiO2 fibers can be large - scale fabrication by eleetrospinning technique and the fibers have good photocatalytie activity. The highest photocatalytic degradation of MB can reach 96. 5% in 100 min. Analysis of degradation kinetics shows the reac- tion follows first - grade reaction. Furthermore, separating and recycling experiments demonstrate the TiO2 fibers can easily be separa- ted and reused.