Cui Haiqin, Cao Yue, Jing Liqiang, Luan Yunbo, Li Na
Key Lab of Functional Inorganic Materials Chemistry, Heilongjiang University, Ministry of Education, School of Chemistry and Materials Science, Harbin 150080 (P. R. China).
Chempluschem. 2014 Feb;79(2):318-324. doi: 10.1002/cplu.201300285. Epub 2013 Nov 4.
In this work, commercial P25 TiO is modulated by post-treatments with different acidic substances, and the effects of residual acidic substances on the photogenerated charge separation of TiO and its photocatalytic activity are investigated in detail. It is demonstrated by means of atmosphere-controlled surface photovoltage spectroscopy that an increase in acid surface modification is favorable for improving the photogenerated charge separation of TiO . As a result, its photocatalytic activity for the degradation of gas-phase acetaldehyde is enhanced greatly. On the basis of measurements of O temperature-programmed desorption of untreated and treated TiO , it is confirmed that an increased amount of acid surface modification promotes the adsorption of O on TiO . Hence, it is suggested for the first time that an increase in surface acidity through post-treatment with an appropriate amount of acidic substance leads to a clear enhancement of the photocatalytic activity of TiO by promoting O adsorption, and thus, improving the photogenerated charge separation of TiO . This work provides a feasible route for the synthesis of high-activity oxide-based semiconductor photocatalysts through surface modification with stable inorganic acids.
在本工作中，商用P25 TiO通过用不同酸性物质进行后处理来调制，并详细研究了残留酸性物质对TiO光生电荷分离及其光催化活性的影响。通过气氛控制表面光电压光谱表明，酸性表面改性的增加有利于改善TiO的光生电荷分离。结果，其对气相乙醛降解的光催化活性大大提高。基于对未处理和处理过的TiO的O程序升温脱附测量，证实酸性表面改性量的增加促进了O在TiO上的吸附。因此，首次提出通过用适量酸性物质进行后处理来增加表面酸度，通过促进O吸附，从而改善TiO的光生电荷分离，导致TiO光催化活性明显增强。这项工作为通过用稳定无机酸进行表面改性来合成高活性氧化物基半导体光催化剂提供了一条可行的途径。
