Photodegradation of congo red using XeBr, KrCl and Cl₂ barrier discharge excilamps: A kinetics study
2011
Murcia, M.D. | Gomez, M. | Gómez, E. | Gómez, J.L. | Christofi, N.
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.
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