亲水性PVDF/TiO_(2)复合薄膜的制备及光催化性能

Investigation of Preparation and Photocatalytic Properties of Hydrophilic PVDF/TiO_(2) Composite Membranes

本实验采用平板刮膜法制备PVDF/TiO_(2)复合薄膜,再通过超声清洗致孔剂并改变其亲水性,然后对样品薄膜的微观形貌、力学性能、光催化性能等进行研究与分析。研究发现:PVDF/TiO_(2)复合薄膜的拉伸强度和光催化降解能力均随着TiO2的加入呈现先增后减的趋势,在TiO_(2)添加量为10%时,其复合薄膜的拉伸强度达到最大值,光催化降解能力最优,并且样品薄膜的光催化降解符合准一级动力学方程。随着超声时间的延长,样品薄膜的亲水性变差,但其仍为亲水性薄膜,光催化降解率先增后减,且当超声时间为3 h时,光催化降解率达到最大值。

In this study, PVDF/TiO_(2) composite membranes were prepared via solution scraping method and ultrasonic cleaning which can drill and change its hydrophilic. Micromorphology, mechanical properties and photocatalytic properties of PVDF/TiO_(2) composite membranes were studied and analyzed. The results show that: the tensile strength and photocatalytic degradation ability of samples increase at first and then get worse with increasing of TiO_(2), and they simultaneously reach the maximum when addition of 10% TiO_(2). Furthermore, the photocatalytic degradation of samples conforms to the first-order kinetic models. Moreover, with the increment of ultrasonic time, the sample membranes are becoming less hydrophilic but they are still hydrophilic membranes, and their photocatalytic degradation rate increases first and then decreases. Further, when the ultrasonic time is 3 h, the photocatalytic degradation rate reaches the extreme value.