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Investigation of phenol degradation: True reaction kinetics on fixed film titanium dioxide photocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
41394 45887 2011 9 PDF Available
Title
Investigation of phenol degradation: True reaction kinetics on fixed film titanium dioxide photocatalyst
Abstract

This study of photocatalytic oxidation of phenol over titanium dioxide films presents a method for the evaluation of true reaction kinetics. A flat plate reactor was designed for the specific purpose of investigating the influence of various reaction parameters, specifically photocatalytic film thickness, solution flow rate (1–8 l min−1), phenol concentration (20, 40 and 80 ppm), and irradiation intensity (70.6, 57.9, 37.1and 20.4 W m−2), in order to further understand their impact on the reaction kinetics. Special attention was given to the mass transfer phenomena and the influence of film thickness.The kinetics of phenol degradation were investigated with different irradiation levels and initial pollutant concentration. Photocatalytic degradation experiments were performed to evaluate the influence of mass transfer on the reaction and, in addition, the benzoic acid method was applied for the evaluation of mass transfer coefficient.For this study the reactor was modelled as a batch-recycle reactor. A system of equations that accounts for irradiation, mass transfer and reaction rate was developed to describe the photocatalytic process, to fit the experimentaldataand to obtain kinetic parameters. The rate of phenol photocatalytic oxidation was described by a Langmuir–Hinshelwood type law that included competitive adsorption and degradation of phenol and its by-products. The by-products were modelledthrough their additive effect on the solution total organic carbon.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (134 K)Download as PowerPoint slideHighlights► Phenol photocatalytic oxidation true kinetic parameters were estimated. ► A generalised approach, modelling all reacting species as carbon content, was used. ► Good agreement between experimental and model was achieved. ► Novel fixed film reactors can be designed utilising this model.

Keywords
Titanium dioxide photocatalysis; True reaction rate; Flat plate reactor; Phenol degradation; Langmuir–Hinshelwood; Mass transfer coefficient
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Investigation of phenol degradation: True reaction kinetics on fixed film titanium dioxide photocatalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 404, Issues 1–2, 19 September 2011, Pages 155–163
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