ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Preparation and properties of a new composite photocatalyst based on nanosized titanium dioxide
Peter Ševčík, Gabriel Čík, Tomáš Vlna, and Tomáš Mackuľak
Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
Received: 15 April 2008 Revised: 28 July 2008 Accepted: 15 August 2008
Abstract: The use of photocatalysts supported on adsorbents is receiving substantial attention. Supporting TiO2 with zeolites is found to be one of the best solutions to increase the efficiency of TiO2-based photocatalysts. This work was focused on simple preparation of a TiO2/Na-ZSM-5 composite catalyst by the solid state dispersion (SSD) method and its modification with an organic photosensitizer
— polythiophene (PT). Using the XRD diffractometry, structure of the new composite catalyst was proved. Beside this composite
catalyst, mechanical mixtures of TiO2-based catalysts with Na-ZSM-5 zeolite were prepared. The efficiency of all five available photocatalysts (TiO2, TiO2-PT, mechanical mixture of TiO2 + Na-ZSM-5, mechanical mixture of TiO2-PT + Na-ZSM-5, and the modified SSD-PT composite) on photodegradation of 4-chlorophenol was compared. By measuring the formation
of chloride ions and decreasing the 4-chlorophenol concentration at two different initial concentrations of 4-chlorophenol
in the basic aqueous solution, the photoefficiency and adsorption properties of our photocatalysts were determined.
Keywords: 4-chlorophenol - composite catalyst - heterogeneous photocatalysis - titanium dioxide - ZSM-5 zeolite - thiophene oligomers
Full paper is available at www.springerlink.com.
Chemical Papers 63 (2) 249–254 (2009)