Photoassisted Catalytic Cleavage of the C–F Bond in Pentafluorophenol With ZnO and the Effect of Operational Parameters

Lakshiminarasimhan Ravichandran; Kaliyamoorthy Selvam; Meenakshisundaram Swaminathan

doi:10.1071/CH07109

RESEARCH ARTICLE

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Photoassisted Catalytic Cleavage of the C–F Bond in Pentafluorophenol With ZnO and the Effect of Operational Parameters

Lakshiminarasimhan Ravichandran ^A , Kaliyamoorthy Selvam ^B and Meenakshisundaram Swaminathan ^B ^C

+ Author Affiliations

- Author Affiliations

^A Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.

^B TANFAC Industries Limited, Sipcot, Cuddalore, Tamilnadu, India.

^C Corresponding author. Email: chemres50@gmail.com

Australian Journal of Chemistry 60(12) 951-956 https://doi.org/10.1071/CH07109
Submitted: 14 April 2007 Accepted: 6 September 2007 Published: 4 December 2007

Abstract

The photocatalytic cleavage of the C–F bond in pentafluorophenol (PFP) with ZnO using 254 and 365 nm UV light has been investigated under different conditions. The defluoridation was monitored using an ionometer with a fluoride ion selective electrode. The photocleavage was more effective under 254 nm than under 365 nm UV light. With 254 nm UV light, TiO₂-P25, TiO₂ (anatase), ZnO, and ZrO₂ photocatalyzed the deflouridation of PFP, whereas CdS, CdO, and SnO₂ did not. The defluoridation is enhanced by the addition of oxidants such as KIO₄, KClO₃, (NH₄)₂S₂O₈, and KBrO₃. The periodate ion is found to be the most efficient oxidant. The defluoridation intermediates were found to be tetrafluorodihydroxybenzene, trifluorotrihydroxybenzene, and tetrafluoroquinone

Acknowledgements

The authors thank Sriram Fibers Limited, Chennai, for recording the GC-MS spectra.

References

Photoassisted Catalytic Cleavage of the C–F Bond in Pentafluorophenol With ZnO and the Effect of Operational Parameters

Abstract

Acknowledgements

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