光催化抗雾膜材料的制备及其亲水性研究

Preparation of the Photocatalytic Antifogging Membrane and Its Hydrophilic Property

采用改进的 Sol-Gel技术制备负载型复合光催化抗雾膜材料 ,利用 XRD,AES和接触角测定等手段研究了膜厚度、热处理条件及光照条件等因素对膜材料亲水性的影响 .结果表明 ,光催化抗雾膜的亲水性受控于 Ti O2 的晶型和膜比表面 ,大比表面和高锐钛矿含量可降低膜对水的接触角 .膜的厚度通过改变催化剂量和光利用率影响材料的亲水性 .膜材料亲水性对光照强度的响应呈阶跃特性 。

Supported multicomponent membranes with photocatalytic antifogging property were prepared by the improved sol gel method. The influences of preparation and experiment conditions such as thickness of membrane, temperature and time of sintering, light source, and intensity of illumination on hydrophilicity of the membranes were studied by using XRD, AES and water contact angle measurement. The results show that TiO 2 crystal type and specific surface area of the membrane are the important factors affecting the hydrophilicity of the photocatalytic antifogging membrane. The water contact angle is decreased with increasing the specific surface area and the content of anatase. Hydrophilicity of the membrane was also determined by thickness of membrane due to the amount of catalyst and efficiency of UV light absorption. It was found that the hydrophilicity has a step response to intensity of illumination. Sunlight illumination has a similar efficiency to the ultraviolet lamp for recovering and maintaining hydrophilicity of membrane.