溶剂热法合成光催化剂与甲醛降解性能研究

Preparation of Rhombic Spherical TiO₂ by Solvothermal Self-Growth and Study of Formaldehyde Degradation Properties

摘要: 随着居民生活水平的提高，由于装潢材料和室内家具的使用，使得车内、室内等封闭环境中的甲醛含量较高，对人们的身体健康造成很大的隐患，为此，如何有效降解室内甲醛含量成为广大学者研究的重要方向，本文采用溶剂热法制备出了一种具有独特形貌的TiO₂ (DT)，对DT的组成、形貌和结构进行了多种形式的表征，包括拉曼光谱仪、X射线衍射仪和扫描电子显微镜，按照室内空气质量标准搭建了甲醛降解平台，对DT降解甲醛的光催化性能进行了表征，光催化测试结果显示DT对甲醛有着良好的催化降解效果，2小时甲醛降解率可达61.62%。对DT的甲醛降解过程进行动力学分析，发现DT对甲醛的降解过程符合一级动力学反应。通过表征DT参与甲醛降解前后的晶体结构并未改变，显示出DT良好的光催化结构稳定性。

Abstract: With the improvement of residents’ living standards, due to the use of decoration materials and indoor furniture, the content of formaldehyde in cars, indoors and other closed environments is high, which poses a great hidden danger to people’s health. Therefore, how to effectively degrade indoor formaldehyde has become an important research direction of scholars. In this paper, a kind of TiO₂ (DT) with unique morphology was prepared by solvothermal method. The composition, morphology and structure of DT were characterized in many forms, including Raman spectrometer, X-ray diffractometer and scanning electron microscope. A formaldehyde degradation platform was built according to indoor air quality standards, and the photo catalytic performance of DT for formaldehyde degradation was characterized. The photo catalytic test results show that DT has a good catalytic effect on formaldehyde degradation, and the formaldehyde degradation rate can reach 61.62% in 2 hours. Based on the kinetic analysis of the formaldehyde degradation process of DT, it was found that the formaldehyde degradation process of DT conformed to the first-order kinetic reaction. The crystal structure of DT has not changed before and after formaldehyde degradation, which shows that DT has good photo catalytic structure stability.