沸石负载TiO2光催化水泥基材料的制备与性能研究

关键字：沸石,负载,TiO2,光催化,水泥基,材料,制备

（1. 同济大学 先进土木工程材料教育部重点实验室，上海  201804；2.同济大学 环境科学与工程学院，上海  200092）

 
    摘要：光催化技术在污水处理方面具有成本低、效率高和环境友好等特点，是近年来环境领域重点开发的新技术。以钛酸四丁酯为前驱体，通过溶胶-凝胶法制备TiO2溶胶，采用浸润法制备TiO2/沸石光催化剂，采用XRD表征光催化剂的化学组成。将TiO2/沸石光催化剂均匀洒布于水泥基材料上制备光催化水泥基材料，并研究其光催化性能。研究煅烧温度、TiO2负载量、pH值对亚甲基蓝降解效率的影响。结果表明：煅烧温度为200 ℃时，制备的TiO2光催化性能最佳；TiO2负载量越高，亚甲基蓝溶液pH值越低，光催化效率越好；沸石负载TiO2后两者相结合产生了协同效应，起到了“超叠加”效果，极大地提高了光催化降解效率。
    关键词：光催化水泥基材料；二氧化钛；沸石；降解；亚甲基蓝
    中图分类号：TU599        文献标识码：A        文章编号：1001-702X（2018）01-0050-04
　　

Preparation and properties study of zeolite-loaded TiO2 photocatalytic cement based materials
SHE Anming1，YE Jinwen1，YAO Wu1，CHU Wenhai2
（1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China；2.School of Environmental Science and Engineering，Tongji University，Shanghai 200092，China）

    Abstract：The photocatalytic technology has the characteristics of low cost，high efficiency and environmental friendliness in wastewater treatment. It is a new technology developed in the field of environment in recent years. The TiO2 sol and TiO2/zeolite photocatalytic were prepared by sol-gel method and infiltration method respectively using tetrabuty titanate as precursors. The chemical composition of the photocatalysts were characterized by XRD. TiO2/zeolite photocatalyst was uniformly dispersed on cementitious materials to prepare photocatalytic cement-based materials，and their photocatalytic performance were studied. The effects of calcination temperature，TiO2 loading and pH value on the degradation efficiency of methylene blue were also studied by using methylene blue as degradation agent. The results show that the photocatalytic activity of TiO2 is best when the calcination temperature is 200 ℃. The higher the loading of TiO2，the lower the pH value of methylene blue solution，the better the photocatalytic efficiency. The synergistic effect is obtained by the combination of zeolite and TiO2 which plays a "super-superposition" effect，and the effect of photocatalytic degradation was greatly improved.
    Key words：photocatalytic cement-based materials，TiO2，zeolite，photodegradation，methylene blue