Adsorption and Photodecomposition of Diphenolic Acid in /spl alpha/- or /spl beta/- Cyclodextrins and TiO/sub 2/ Suspensions

2009 Symposium on Photonics and Optoelectronics Pub Date : 2009-09-01 DOI:10.1109/SOPO.2009.5230121

Li Guo, Bei-bei Wang, Wenyu Huang, F. Wu, Yiming Li

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Abstract

The adsorption and photodecomposition of diphenolic acid (DPA) was investigated in the presence of αor cyclodextrins (CDs) and TiO2 suspensions. The adsorption of DPA on TiO2 surface and inclusion complex of CDs and DPA were critical factor in the photocatalytic reaction. Results showed that, the adsorption isotherms of DPA could be plotted with the Langmuir isotherm model, and the maximum adsorption capacity increased in the order of α-CD/TiO2 TiO2> -CD/ TiO2). The influence factors of -CD concentration, DPA initial concentration on photodegradation of DPA were studied. This paper also simply explored the mechanism of the different degradation effect in the presence of or -CD. With the addition of -cyclodextrin, the enhancement of photodegradation of DPA mainly results from the enhancement of adsorption of DPA on TiO2 surface and the lower bond energy between some atoms in DPA molecule after inclusion interactions with -CD. While with the addition of -CD, the photodecomposition inhibition role of -CD to DPA on TiO2 surface leaded to reducing photodegradation of DPA, because CD and DPA did not form a stable inclusion compounds and decreased the adsorption amount of DPA on the TiO2 surface. Keywords-TiO2 ;diphenolic acid ; cyclodextrin; photodecomposition ; adsorption

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二酚酸在/spl α /-或/spl β /-环糊精和TiO/sub - 2/混悬液中的吸附和光分解

研究了α或环糊精(CDs)和TiO2悬浮液对二酚酸(DPA)的吸附和光分解。DPA在TiO2表面的吸附和cd与DPA的包合物是光催化反应的关键因素。结果表明，DPA的吸附等温线可以用Langmuir等温线模型绘制，最大吸附量的大小顺序为α-CD/TiO2 > -CD/TiO2)。研究了-CD浓度、DPA初始浓度对DPA光降解的影响因素。本文还简单探讨了在或-CD存在下不同降解效果的机理。加入-环糊精后，DPA的光降解增强主要是由于DPA在TiO2表面的吸附增强以及与-CD包合后DPA分子中部分原子之间的键能降低。而随着-CD的加入，-CD对TiO2表面DPA的光分解抑制作用导致DPA的光降解减少，因为CD和DPA没有形成稳定的包合物，降低了DPA在TiO2表面的吸附量。关键词:tio2;二酚酸;环糊精;光解作用;吸附

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2009 Symposium on Photonics and Optoelectronics

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