Synergism of Activated Carbon and Undoped and Nitrogen-doped TiO2 in the Photocatalytic Degradation of the Chemical Warfare Agents Soman, VX, and Yperite
Article first published online: 6 APR 2009
Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 2, Issue 5, pages 427–436, May 25, 2009
How to Cite
Cojocaru, B., Neaţu, Ş., Pârvulescu, Vasile I., Şomoghi, V., Petrea, N., Epure, G., Alvaro, M. and Garcia, H. (2009), Synergism of Activated Carbon and Undoped and Nitrogen-doped TiO2 in the Photocatalytic Degradation of the Chemical Warfare Agents Soman, VX, and Yperite. ChemSusChem, 2: 427–436. doi: 10.1002/cssc.200800246
- Issue published online: 19 MAY 2009
- Article first published online: 6 APR 2009
- Manuscript Received: 6 DEC 2008
- Science for Peace Programme. Grant Number: 981476
- Spanish Ministry of Science and Education. Grant Number: CTQ2006–06857
The degradation of chemical warfare agents is investigated. Active carbon, in minor quantities (5–25 wt %), renders nitrogen-doped titania active towards the degradation of several such compounds. This cooperative effect is attributed to the preferential generation of reactive oxygen species on the photocatalyst and preferential adsorption of the chemical warfare agent onto carbon.
Efficient photocatalytic decomposition of chemical warfare agents is a process that may find application in emergency situations or for the controlled destruction of chemical warfare stockpiles. A series of heterogeneous photocatalysts comprising TiO2–activated carbon or N-TiO2–activated carbon composites exhibit excellent photocatalytic activity to effect the complete decomposition of yperite, soman, and VX in high concentrations. The remarkable photocatalytic activity arises from the synergism between adsorption on active carbon and photoactivity by titania. Nitridation makes the composite also active under visible-light irradiation.