Degradation of pentachlorophenol in cyclodextrin extraction effluent using a photocatalytic process

The Science of the Total Environment
Khalil HannaC Ferronato

Abstract

This work evaluates a process for the elimination of pentachlorophenol (PCP) from effluents provided by a cyclodextrin-assisted flushing of contaminated soils. The effectiveness of photocatalytic degradation of PCP in several cyclodextrin (CD) solutions was evaluated using TiO2 as a photocatalyst. Effects of CD type on PCP degradation rate were studied at two pH values. A similar effect was observed for all CDs used on degradation rate of PCP and the decay of PCP was found to be less extensive at pH 11 than at pH 7. The kinetic orders of the photocatalytic reactions of PCP for all of the solutions have been determined. The first-order rate constants were found to be 0.0884, 0.0362, 0.0197 and 0.0053 min(-1) in CD solutions, respectively, at 0, 1, 2 and 5 mmol l(-1) of CD. Batch experiments were performed in order to study the CD extraction enhancement of PCP previously adsorbed on soil. The results show that the removal capacity of PCP from soil increases with CD concentration (from 0 to 5 mmol l(-1)). When the CD concentration was 5 mmol l(-1), an extraction of about 70% of PCP adsorbed on soil was observed, whereas only 37% was removed when water was used as the flushing solution. The optimal conditions for such a coupled met...Continue Reading

References

Aug 1, 1991·Archives of Environmental Contamination and Toxicology·D P MiddaughP J Chapman
Apr 16, 2004·Journal of Environmental Management·K HannaP Germain
May 1, 1994·Environmental Science & Technology·M L BrusseauQ Hu

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Citations

Dec 29, 2015·Journal of Hazardous Materials·Clément TrelluMehmet A Oturan
Jul 25, 2008·Marine Environmental Research·Toshinobu TokumotoAkinori Maezawa
Nov 23, 2006·Journal of Environmental Management·Jin AnotaiChettiyappan Visvanathan
Sep 29, 2005·Environmental Pollution·Christophe VigliantiPatrick Germain
Jun 25, 2010·Journal of Environmental Monitoring : JEM·Matteo SpagnuoloPacifico Ruggiero
Apr 5, 2005·Toxicology·P Fernández FreireM J Hazen

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