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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。
In this paper, different diameters of polyvinylpyrrolidone (PVP) / n-butyl titanate (TBT) composite fibers were prepared by electrospinning method, and different diameter TiO2 fibers were obtained after calcination at high temperature. The prepared fibers were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and infrared spectroscopy (FTIR). Using methylene blue (MB) as the wastewater model, the photocatalytic activity of TiO2 fibers with different diameters was studied. The results show that the electrospinning method is suitable for the preparation of TiO2 fibers with different diameters in large area and the prepared fibers have good photocatalytic activity. The degradation rate of methylene blue reaches 96.5% in 100 min. Degradation kinetics studies show that the reaction follows the first-order kinetic equation. At the same time, separation and recycle experiments show that the TiO2 fiber prepared by electrospinning method has the advantages of easy separation and good reusability.