在线客服: 点击这里给我发消息  新用户使用步骤:会员注册→充值→重新登入→进入资源
标题:Preparation of nano-TiO2/diatomite-based porous ceramics and their photocatalytic kinetics for formaldehyde degradation
时间:2020-02-14 17:18:56
DOI:10.1007/s12613-018-1548-0
作者:Ru-qin Gao;Qian Sun;Zhi Fang
出版源: 《International Journal of Minerals Metallurgy a... ,2018 ,25 (1) :73-79
摘要:Diatomite-based porous ceramics were adopted as carriers to immobilize nano-TiO_2 via a hydrolysis-deposition technique. The thermal degradation of as-prepared composites was investigated using thermogravimetric–differential thermal analysis, and the phase and microstructure were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy. The results indicated that the carriers were encapsulated by nano-TiO_2 with a thickness of 300–450 nm. The main crystalline phase of TiO_2 calcined at 650℃ was anatase, and the average grain size was 8.3 nm. The FT-IR absorption bands at 955.38 cm~(-1) suggested that new chemical bonds among Ti, O, and Si had formed in the composites. The photocatalytic(PC) activity of the composites was investigated under UV irradiation. Furthermore, the photodegradation kinetics of formaldehyde was investigated using the composites as the cores of an air cleaner. A kinetics study showed that the reaction rate constants of the gas-phase PC reaction of formaldehyde were κ = 0.576 mg·m~(–3)·min~(–1) and K = 0.048 m~3/mg.
大小:821 kb
下载: 点击下载
预览:

浏览器不支持嵌入PDF阅读,打开新页面在线阅读

本页内容由网络收集而来,版权归原创者所有,如有侵权请及时联系