Abstract
Enhancement of β-cyclodextrin (β-CD) on TiO 2 photocatalytic degradation of bisphenol A (BPA) was investigated under a 250 W metal halide lamp ( λ ≥ 365 nm) in this work. In the system of photocatalytic degradation of BPA, the photodegradation rate of BPA in aqueous solutions containing β-CD and TiO 2 was obviously faster than that in aqueous solutions containing only TiO 2. After 60 min of irradiation, β-CD could increase the photodegradation efficiency by about 23% for 10 mg l −1 BPA in the UV–vis/TiO 2 system, the photodegradation of 2.5–20.0 mg l −1 BPA in aqueous solutions was found to follow pseudo-first-order law, and the adsorption constant and the reaction rate constant of BPA in the system containing β-CD and TiO 2 are obviously higher than those in the system containing only TiO 2, the influence factors on photodegradation of BPA were studied and described in details, such as β-CD concentration, pH, BPA initial concentration and gas medium. The formation of CO 2 as a result of mineralization of BPA was observed during the photodegradation process. After 120 min of irradiation, the mineralization efficiency of BPA reached 100% in the presence of β-CD, whereas mineralization efficiency was only 36.7% in the absence of β-CD. The enhancement of photodegradation of BPA mainly results from the enhancement of adsorption of BPA on TiO 2 surface and the lower bond energy between some atoms in BPA molecule after inclusion interactions with β-CD.
Published Version
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