光催化薄膜的亲水性及其应用  

Hydrophilicity of photocatalytic films and its applications

作　　者：黄宇[1] 刘燕[1] 张静[1] 王震宇[1] 曹军骥[1] HUANG Yu;LIU Yan;ZHANG Jing;WANG Zhenyu;CAO Junji(Key Laboratory of Aerosol Chemistry and Physics,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China)

机构地区：[1]中国科学院地球环境研究所气溶胶化学与物理重点实验室,西安710061

出　　处：《地球环境学报》2018年第5期415-433,共19页Journal of Earth Environment

基　　金：国家自然科学基金项目(41401567;41573138)~~

摘　　要：玻璃表面的雾化及建筑物表面的污染严重影响人们日常生活及工业。传统方法通常借助外力解决表面雾化及污染问题,如人工清洗,不仅维护成本高,而且施工难度大。光催化亲水薄膜作为一种具有特殊润湿性的表面,可高效持久地实现基底表面的防雾和自清洁功能。近年来,光催化薄膜防雾和自清洁性能的研究不断涌现,但相关的针对性综述却很少。本文详细阐述了光催化薄膜的亲水原理及亲水性评价方法,重点介绍了亲水性的改善方法,并对缺乏研究的亲水性与光催化分解有机污染物活性关系进行了简要概述,总结了国内外光催化薄膜亲水性的应用现状,分析了其存在问题及发展方向,旨在为光催化薄膜亲水性的研究及其应用起到一定的指导作用。Background,aim,and scope Nowadays,glass fogging and building exterior pollution have influenced all aspects of our social lives.For instance,fogging of rearview mirror would affect visibility and increase the occurrence of traffic accidents;the fouling of building walls and sculptures would affect appearance and even corrode the material.Traditionally the surface cleaning was performed manually,which is expensive and high risky,especially for skyscrapers cleaning.Recently,the photo-induced hydrophilic film,as one of the special wetting surface,has emerged as a self-cleaning surface that can be used for anti-fouling function with low maintenance cost and operation risk.The good water wettability can be obtained under solar light,which can effectively reduce the refraction and total reflection to achieve the anti-fogging effect.In addition,the dust and pollutants can be removed thoroughly by rainfall to prevent surface fouling.In this background,it is necessary to conduct a systematical review on photocatalytic hydrophilic film.Materials and methods This review focused on the following aspects:(1)the hydrophilic theory of photocatalytic film;(2)the evaluation methods of hydrophilicity;(3)the relationship between photocatalytic activity and hydrophilicity;(4)the strategies of improving hydrophilicity;and(5)the application level of photocatalytic hydrophilic film.Results Firstly,taking TiO2 for example,four typical hydrophilic theories of photocatalytic film are summarized as following:(1)2D/3D capillary effect:simulating spike-decorated tubes to porous materials with different cohesion and adhesive force of water inside and outside of thin tubes,the water molecules tend to infiltrate or rise in the thin tubes and crack of spikes,which macroscopically results in water wettability on the film surface;(2)photo-induced generation of surface vacancies:oxygen vacancies can be formed at the two coordinated oxygen bridging sites near the surface under UV irradiation,and the oxygen vacancies can increase the amount of hydrox

关 键 词：光催化薄膜 亲水性 防雾 自清洁 

分 类 号：O643.36[理学—物理化学] TB383.2[理学—化学]