Photodegradation of congo red using XeBr, KrCl and Cl2 barrier discharge excilamps: A kinetics study

Different physical, biological and chemical methods have been used to remove congo red mainly from textile industry effluents. All of these treatments usually transfer the contamination from one phase to another. In this work the oxidation of congo red using a combined advanced oxidation treatment b...

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Bibliographic Details
Published in:Desalination 2011-10, Vol.281, p.364-371
Main Authors: Murcia, M.D., Gómez, M., Gómez, E., Gómez, J.L., Christofi, N.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Cl2 excilamp
Congo red
Contamination
Conversion
Correlation
desalination
Discharge
Effluents
Exact sciences and technology
KrCl excilamp
lamps
Oxidation
Photodegradation
photolysis
Pollution
Reactors
textile industry
Textiles
ultraviolet radiation
UV/H2O2 process
XeBr excilamp
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Summary:Different physical, biological and chemical methods have been used to remove congo red mainly from textile industry effluents. All of these treatments usually transfer the contamination from one phase to another. In this work the oxidation of congo red using a combined advanced oxidation treatment based on photodegradation with UV radiation generated by KrCl, XeBr and Cl2 excimer lamps in the presence of H2O2 has been studied. Experiments suggest that high congo red conversion values (>90%) were only reached with KrCl excilamp in the absence of H2O2. In the presence of a molar ratio H2O2/congo red of 12.5/1 KrCl excilamp totally removed congo red in 120min whereas XeBr needed a molar ratio H2O2/congo red of 25/1 to attain total removal in the same time. Due to its low radiation intensity compared to the other two excilamps, Cl2 excilamp never reached total removal of congo red in the experimental range assayed. Based on the experimental data, a pseudo-first order kinetic model for the three excilamps was proposed. A good correlation between experimental and calculated data was obtained. ► Congo red was oxidized with UV radiation generated by excilamps combined with H2O2. ► High congo red conversion values were only reached with KrCl excilamp without H2O2. ► In the presence of H2O2 KrCl removes congo red quicker than XeBr and Cl2 excilamps. ► Pseudo-first order kinetic model was successfully applied for the three excilamps.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2011.08.011