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Enhanced TiO2 photocatalytic degradation of bisphenol A by β-cyclodextrin in suspended solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
28732 44089 2006 8 PDF Available
Title
Enhanced TiO2 photocatalytic degradation of bisphenol A by β-cyclodextrin in suspended solutions
Abstract

Enhancement of β-cyclodextrin (β-CD) on TiO2 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 TiO2 was obviously faster than that in aqueous solutions containing only TiO2. 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/TiO2 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 TiO2 are obviously higher than those in the system containing only TiO2, 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 CO2 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 TiO2 surface and the lower bond energy between some atoms in BPA molecule after inclusion interactions with β-CD.

Keywords
Bisphenol A; Photocatalytic degradation; β-Cyclodextrin; Enhancement
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Enhanced TiO2 photocatalytic degradation of bisphenol A by β-cyclodextrin in suspended solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 179, Issues 1–2, 1 April 2006, Pages 49–56
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us