TiO2-CNTs复合光催化剂的制备及其光催化性能
Preparation and Photocatalytic Performance of TiO2-CNTs Composite Photocatalyst
张瀚文 1习小明 1卓晓军 1沈裕军 1周小舟 2彭俊1
作者信息
- 1. 长沙矿冶研究院有限责任公司,湖南 长沙 410012
- 2. 中南大学 冶金与环境工程学院,湖南 长沙 410083
- 折叠
摘要
采用溶胶-凝胶法和超声分散法制备了TiO2-CNTs复合光催化剂,并进行了光催化还原CO2 活性测试.结果表明,当CNTs负载量为 0.75%时,TiO2-CNTs复合光催化剂光催化还原CO2 的性能较佳,在波长 365 nm的紫外光照射下,相比于单一TiO2 催化剂,CH4 平均产率提升了 90%,CO平均产率提升了 156%.反应机理认为:CNTs作为助催化剂与半导体TiO2 形成了紧密的电子传输结构,显著加快了光生载流子的转移,降低了电子-空穴的复合效率;此外,CNTs高比表面积和优异的吸附性能可以增加反应活性位点,从而提高催化剂光催化还原CO2 效率.
Abstract
A composite photocatalyst of TiO2-CNTs was synthesized by adopting the sol-gel method and ultrasonic dispersion,and then its activity in the photocatalytic reduction of CO2 was tested.With a load capacity of carbon nanotubes(CNTs)at 0.75%,the TiO2-CNTs present a better performance in photocatalytic CO2 reduction.Under UV irradiation with wavelength of 365 nm,the average yield of CH4 and CO from the composite catalyst are enhanced by 90%and 156%respectively,compared to the usage of single TiO2 catalyst.It is believed that the reaction is based on the following mechanisms:CNTs,as a co-catalyst,forms a compact electron transport structure with semiconductor of TiO2,which significantly accelerates the transfer of photogenic carriers and reduces the electron-cave recombination efficiency.In addition,high specific surface area and excellent adsorption performance of CNTs can increase active sites for reaction,thus improving efficiency of photocatalytic reduction of CO2 by the catalyst.
关键词
光催化剂/二氧化碳/碳纳米管/TiO2/溶胶-凝胶法/紫外光/催化还原/活性点位/光生载流子Key words
photocatalyst/CO2/carbon nanotube/TiO2/sol-gel method/UV light/catalytic reduction/active site/photogenic carrier引用本文复制引用
出版年
2024
NETL
NSTL
万方数据