Mineralization of C.I. Acid Red 14 azo dye by UV/Fe-ZSM5/H2O2 process

The zeolite Fe-ZSM5 was applied as a heterogeneous catalyst in the photo-Fenton process for mineralization of azo dye Acid Red 14 (AR14). Under optimal conditions (20 mM of H 2 O 2, 0.25 g L −1 of catalyst and initial natural pH of the solution) 76% of total organic carbon (TOC) of a solution contai...

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Bibliographic Details
Published in:Environmental technology 2010-02, Vol.31 (2), p.165-173
Main Authors: Kasiri, Masoud B., Aleboyeh, Hamid, Aleboyeh, Azam
Format: Article
Language:English
Subjects:
activation energy
Azo
Azo Compounds - chemistry
Catalysis
Catalysts
dye degradation
Dyes
Efficiency
electrical energy consumption
Energy consumption
heterogeneous photo-Fenton
Hydrogen Peroxide - chemistry
Iron
Iron - chemistry
kinetic model
Kinetics
Mathematical models
Mineralization
Photocatalysis
Photochemical Processes
Photochemistry - methods
Reaction kinetics
Solar energy
Spectrophotometry, Ultraviolet
Ultraviolet Rays
Water Pollutants, Chemical - chemistry
Zeolites - chemistry
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Summary:The zeolite Fe-ZSM5 was applied as a heterogeneous catalyst in the photo-Fenton process for mineralization of azo dye Acid Red 14 (AR14). Under optimal conditions (20 mM of H 2 O 2, 0.25 g L −1 of catalyst and initial natural pH of the solution) 76% of total organic carbon (TOC) of a solution containing 40 mg L −1 of the dye could be removed after 120 min in a 1.0 L tubular, closed-circulation batch photoreactor. Leaching tests and comparative experiments indicated that the application of the heterogeneous catalyst could increase the photo-Fenton process efficiency. A kinetic model was developed for this process and showed that the dye mineralization rate obeyed the pseudo-first order kinetic when the initial concentration of the dye was low. It was also observed that the catalytic behaviour of Fe-ZSM5 could be reproduced in consecutive experiments without a considerable drop in the process efficiency. Estimation of electrical energy consumption (EE/O) of the process as a function of mineralization efficiency revealed that the UV/Fe-ZSM5/H 2 O 2 process not only increased the mineralization efficiency of the process, but also decreased the cost of electrical energy consumed by the process.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330903397771