Photochemical behaviour of diphenolic acid in β- cyclodeztrin and TiO2 suspensions
This paper investigated the photochemical behavior of diphenolic acid (DPA) in the presence of β-cyclodextrin (CD) and TiO2 suspensions under a 250W metal halide lamp (λ≥365nm). The interaction of DPA with CD yielded the formation of inclusion complexes at 1:1 stoichiometric ratio in solution. The irradiation of DPA and TiO2 suspensions in the presence of β-CD showed that the photodegradation rate of DPA was enhanced. The photodegradation of 10-80μmol/L DPA in suspended solutions was found to follow the pseudo-first-order law. Obviously, the photocatalytic degradation reaction rate constant of DPA in the system containing β-CD is higher than that without β-CD. The adsorption isotherms of DPA could be plotted with the Langmuir isotherm model, and the maximum adsorption capacity increased in presence of β-CD/TiO2. The influence factors of β-CD concentration, DPA initial concentration on photodegradation of DPA were studied in details. This paper also simply explored the mechanism of the photocatalytic degradation effect in the presence of β-cyclodextrin. With the addition of β-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 β-CD. This could be a promising method for contaminated water remediation.
diphenolic acid cyclodeztrin photocatalysis adsorption TiO2
Li Guo Yanxiang Liu Beibei Wang Feng Wu Yiming Li
School of Resources and Environmental Science,Wuhan University Department of Military Supplyment,Mil School of Resources and Environmental Science,Wuhan University Department of Military Supplyment,Military Economic Academy Wuhan,PR China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）