Zeolite matrix assisted decomposition of singlet oxygen sensitizers during photooxidation

J. Shailaja, J. Sivaguru, V. Ramamurthy

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Thiazine dyes such as thionine, methylene blue and methylene green were exchanged within monovalent cation exchanged Y zeolites. Depending on the water content the dye molecules exist as either monomer (‘dry’) or dimer (‘wet’). The monomeric dye is effective in producing singlet oxygen by energy transfer process inside the zeolite cavity. In polar zeolites like LiY, NaY energy transfer predominates whereas in basic zeolites like CsY electron transfer overtakes the energy transfer leading to the photo-destruction of the dye. While on short time of irradiation, energy transfer to oxygen led to selectivity in the product distribution, but on prolonged irradiation, destruction of the dye through electron transfer was the main outcome.

Original languageEnglish (US)
Pages (from-to)197-205
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume331
DOIs
StatePublished - Dec 1 2016

Keywords

  • Dye decomposition by zeolites
  • Electron and energy transfer within zeolites
  • Photooxidation within zeolite
  • Singlet oxygen
  • Stability of singlet oxygen generating dyes
  • Zeolite photochemistry

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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