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Photocatalytic decolorization of Remazol Black 5 (RB5) and Procion Red MX-5B—Isotherm of adsorption, kinetic of decolorization and mineralization

Paper ID Volume ID Publish Year Pages File Format Full-Text
48641 46516 2007 10 PDF Available
Title
Photocatalytic decolorization of Remazol Black 5 (RB5) and Procion Red MX-5B—Isotherm of adsorption, kinetic of decolorization and mineralization
Abstract

The isotherm of adsorption and the kinetic of photocatalytic degradation of two azo dyes, Remazol Black 5 (RB5) and Procion Red MX-5B are reported and compared using different concentrations of dyes. The photocatalytic degradation is performed in aqueous solutions in the presence of TiO2 Degussa P25 under artificial UV light radiation (λ > 290 nm).The isotherms of adsorption of the both dyes are very different. These differences are discussed considering the pH of the solution and the structure of the dye. In opposition to the isotherm of adsorption, the kinetic of both dyes are very similar, and fit well with the Langmuir–Hinshelwood model in the concentration range 5–60 μmol/L. However, at higher dyes concentration, the initial rate of decolorization decreases. The important absorption of light by the dyes was suggested to be at the origin of this decrease of the decolorization. The absence of correlation between isotherm of adsorption in the dark and the decolorization kinetics is discussed.The attribution of main UV–vis bands of each dye has been performed by molecular modelisation using Density Functional Theory (DFTT). Their evolution as a function of time, the evolution of pH during the photocatalytic process and the determination of the decrease of Total Organic Carbon (TOC) and of the evolution of inorganic ions are used to better understand the decolorization mechanism occurring for these both dyes.

Keywords
Photocatalysis; TiO2; Dyes; Isotherm; Kinetic; Mechanism
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Photocatalytic decolorization of Remazol Black 5 (RB5) and Procion Red MX-5B—Isotherm of adsorption, kinetic of decolorization and mineralization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 77, Issues 1–2, 30 November 2007, Pages 100–109
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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