Cr modified TiO 2-loaded MCM-41 catalysts for UV-light driven photodegradation of diethyl sulfide and ethanol

P. A. Kolinko, P. G. Smirniotis, D. V. Kozlov, A. V. Vorontsov

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14 Scopus citations


Gas-phase photocatalytic oxidation (PCO) and adsorption of diethyl sulfide and ethanol in a batch reactor using Cr-modified TiO 2-loaded MCM-41 silica and commercial TiO 2 as photocatalysts were studied with in situ FTIR method. Mesoporous molecular sieves MCM-41 modified with Cr were synthesized by hydrothermal method; Si:Cr atomic ratio was 80:1 or 20:1. Final deposition of 25% TiO 2 was conducted by sol-gel method using titanium isopropoxide as a precursor. Adsorption measurements in a static reactor were used to estimate the Langmuir isotherm parameters (monolayer capacity and adsorption constant). Photooxidation experiments under UV irradiation demonstrated that TiO 2 loading on Cr-MCM-41 improve its activity in diethyl sulfide removal but decelerated the CO 2 formation. On the contrary, the rate of ethanol oxidation increased strongly as a result of TiO 2 loading and the highest activity was observed for 25% TiO 2/MCM-41 photocatalyst without chromium. Sulfate species were detected on the TiO 2 surface after complete diethyl sulfide oxidation. Water and CO 2 were identified as the final products whereas acetaldehyde and CO were identified as by-products of ethanol photocatalytic oxidation. Visible light activity was not detected for TiO 2/MCM-41 and TiO 2/Cr-MCM-41 photocatalysts in oxidation of gas phase diethyl sulfide and ethanol.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
StatePublished - 15 Mar 2012
Externally publishedYes


  • CWA
  • Diethyl sulfide
  • Ethanol
  • MCM
  • Photocatalytic oxidation
  • Titanium dioxide
  • Transition metal doping
  • Visible light


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