TiO_2/PVA-CS复合膜的制备及性能的研究

Preparation and Properties of TiO_2/ PVA-CS Composite Membrane

针对TiO2单独使用时存在吸附性差、易聚集、重复利用率低等问题,通过流延法制备了TiO2/聚乙烯醇(PVA)-壳聚糖(CS)复合膜,用XRD、IR及SEM对复合膜进行了结构形貌表征,并测量了其拉伸强度和断裂伸长率,同时以甲基橙为模型物,研究了复合膜在紫外光照下催化其降解的性能。结果表明:TiO2的加入使复合膜的羟基峰向低波数移动,但不改变其X-射线衍射峰,却使其拉伸强度和断裂伸长率增大。同时TiO2与PVA、CS相容性较好;紫外光作用下,有利于降解反应的进行,复合膜光催化甲基橙降解反应基本符合一级动力学方程,降解效果良好。

Since TiO_2 displays its disadvantages in poor adsorption, easy aggregation, and low-usage rate when used alone, the TiO_2/PVA-CS composite membrane was prepared by flow coasting, and characterized by XRD, FTIR and SEM. The tensile strength and the elongation at break of the membrane were determined. The removal of methyl orange by composite membrane was studied under UV irradiation. The result showed that the composite membrane had an Einstein shift without change of diffraction peak by the adding of TiO_2, the tensile strength and the elongation at break were strengthened. TiO_2 exhibited good compatibility with PVA and CS. The composite membrane showed good photocatalytic properties under UV irradiation, and the photocatalytic degradation of methyl orange on the composite membrane fits in with the first-order kinetic order.