Collect. Czech. Chem. Commun. 1999, 64, 149-156

Photoassisted Production of O2-• and H2 in Aqueous Medium Stimulated by Polythiophene in ZSM-5 Zeolite Channels

Gabriel Číka,*, František Šeršeňb and Alena Bumbálovác

a Department of Environmental Science, Slovak University of Technology, 812 37 Bratislava, Slovak Republic
b Institute of Chemistry, Faculty of Natural Sciences, Comenius University, 842 15 Bratislava, Slovak Republic
c Department of Pharmaceutical Analysis and Nuclear Pharmacy, Faculty of Pharmacy, Comenius University, 832 32 Bratislava, Slovak Republic


The formation of reactive oxygen species due to irradiation by a visible light of the polythiophene deposited in ZSM-5 zeolite channels in aqueous medium has been studied. Polymerization of thiophene was carried out in zeolite channels after the ion-exchange reaction of Na+ for Fe3+. By means of EPR spectroscopy, the temporarily generated 1O2 in irradiated aqueous medium was proved. The formation of O2-• was confirmed by the reduction of Fe3+-cytochrome c. Irradiation led to the water reduction to hydrogen.

Keywords: ZSM-5 zeolites; Polythiophenes; Reactive oxygen species; Water photoreduction; Water photolysis; Photochemistry.