TiO2相结的可控合成及其在光催化降解室内甲醛中的应用
Controllable synthesis of TiO2 phase junction and its application in photocatalytic degradation of indoor formaldehyde
贾宝丽1
作者信息
- 1. 甘肃钢铁职业技术学院,甘肃嘉峪关 735100
- 折叠
摘要
通过焙烧法成功制备了a-TiO2/r-TiO2 相结试样.XRD和Raman分析表明,通过改变焙烧时间实现了试样中a-TiO2 和r-TiO2 的含量调控.在光催化降解甲醛试验中,所有a-TiO2/r-TiO2 相结试样的活性均高于纯a-TiO2 和r-TiO2 试样.其中组成(w)为 47.6%a-TiO2+52.4%r-TiO2 试样的活性最佳,经过 5 h光照后甲醛降解率达到了 96.9%,反应速率分别为纯a-TiO2 和r-TiO2 试样的 13.6 和24.5 倍.表面光电压谱和光电流曲线分析表明光催化活性差异的主要原因是a-TiO2/r-TiO2 相结促进了光生载流子分离效率,进而提高光催化活性.
Abstract
The a-TiO2/r-TiO2 phase junction samples are successfully prepared by calcination method.XRD and Raman analysis show that the content of a-TiO2 and r-TiO2 in the sample is adjusted by changing the calcination time.In the experiment of photocatalytic degradation of formaldehyde,the activity of all a-TiO2/r-TiO2 phase junction samples is higher than that of pure a-TiO2 and r-TiO2 samples.The sample with 47.6%a-TiO2+52.4%r-TiO2 show the best activity.After 5 hours of light irradiation,the formaldehyde degradation rate can reach 96.9%,and the reaction rate is 13.6 and 24.5 times higher than that of pure a-TiO2 and r-TiO2 respectively.Surface photovoltage spectroscopy and photocurrent curve analysis show that the main reason for the difference in photocatalytic activity is that a-TiO2/r-TiO2 phase junction could promote the separation efficiency of photogenerated carriers,thereby improving the photocatalytic activity.
关键词
a-TiO2/r-TiO2/相结/光催化/甲醛/光生载流子Key words
a-TiO2/r-TiO2/phase junction/photocatalysis/formaldehyde/photogenerated carrier引用本文复制引用
基金项目
嘉峪关市科技创新项目(2021B010002010)
出版年
2024
NETL
NSTL
万方数据