Issue 43, 2008
From the journal:

Physical Chemistry Chemical Physics

Photo-degradation of yperite over V, Fe and Mn-doped titania–silica photocatalysts

Ştefan Neaţu,a   Vasile I. Pârvulescu,*a   Gabriel Epure,b   Emilia Preda,b   Vasile Şomoghi,b   Alessandro Damin,c   Silvia Bordigac  and  Adriano Zecchinac  

* Corresponding authors

a University of Bucharest, Faculty of Chemistry, Department of Chemical Technology and Catalysis, Bd. Regina Elisabeta 4–12, Bucharest, Romania
E-mail: v_parvulescu@chem.unibuc.ro
Fax: +4021 4100241
Tel: +4021 4100241

b Chemical Centre for Defence NBC and Ecology, Sos. Oltenitei 225, Bucharest, Romania

c University of Turin, Department of Chemistry IFM and NIS-Centre of Excellence, Via P. Giuria 7, Turin, Italy

Abstract

The photocatalytic decomposition of yperite (bis(2-chloroethyl)sulfide), a chemical warfare agent, was achieved by using titania–silica catalysts doped with several transition metal ions. The preparation of these catalysts was achieved by impregnation of a titania–silica mixed oxide previously synthesized using a sol-gel route with salts of the doping elements (vanadium, iron, manganese). The above catalysts were characterized using several spectroscopic techniques: FTIR, Raman, DR-UV-Vis, and XPS. The band gap energy was measured for each photocatalytic system. The reaction was carried out in two different types of reactors, i.e. naturally aerated and a closed quartz tube aerated under a constant flow, and using two types of irradiation, UV-Vis and Vis. The investigated systems proved to be extremely active, leading to an almost complete degradation of yperite in 2 h of irradiation. An excellent correlation between the photocatalytic performances and the band gap has been found. Based on the characterization data and on the temporal evolution of the reaction products, a reaction mechanism has been suggested. This mechanism considers two distinct pathways for the decomposition of yperite, namely the C–S bond cleavage and the S oxidation.

Graphical abstract: Photo-degradation of yperite over V, Fe and Mn-doped titania–silica photocatalysts

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Article information

DOI
https://doi.org/10.1039/B810200G
Article type
Paper
Submitted
17 Jun 2008
Accepted
24 Jul 2008
First published
23 Sep 2008

Phys. Chem. Chem. Phys., 2008,10, 6562-6570

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Photo-degradation of yperite over V, Fe and Mn-doped titania–silica photocatalysts

Ş. Neaţu, V. I. Pârvulescu, G. Epure, E. Preda, V. Şomoghi, A. Damin, S. Bordiga and A. Zecchina, Phys. Chem. Chem. Phys., 2008, 10, 6562 DOI: 10.1039/B810200G

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