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Adsorption and photocatalytic bleaching of acid orange 7 on P25 titania

Paper ID Volume ID Publish Year Pages File Format Full-Text
26848 43981 2010 7 PDF Available
Title
Adsorption and photocatalytic bleaching of acid orange 7 on P25 titania
Abstract

The observed adsorption of acid orange 7, AO7−, on P25 titania over a range of pH values (pH 2–8) gives a good fit to data generated using a charge distribution, multisite complexation, i.e. CD-MUSIC, model, modified for aggregated dye adsorption. For this system the model predicts that both the apparent dark Langmuir adsorption constant, KL, and the number of adsorption sites, no, increase with decreasing pH, and are negligible above pH 6. At pH 2 the CD-MUSIC model predicts the fraction of singly co-ordinated sites occupied by the dye, fAO7, is ca. 32% under the in situ monitoring experimental conditions used in this work to study the photocatalytic bleaching of AO7− under UV light illumination ([TiO2] = 20 mg dm−3; [AO7−]total = 4.86 × 10−5 M). Although AO7− adsorption on P25 titania is insignificant above pH 6 and increases almost linearly and markedly below this pH, the measured initial rate of bleaching of AO7−, photocatalysed by titania using UV appears to only increase modestly (

Keywords
Photocatalysis; CD-MUSIC; Adsorption; Photobleaching; Acid orange 7
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Adsorption and photocatalytic bleaching of acid orange 7 on P25 titania
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 216, Issues 2–3, 15 December 2010, Pages 261–267
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
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Full-text PDF Download
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