Photocatalytic decontamination of sulfur mustard (HD) was studied on titania nanomaterials, and data obtained with irradiation of sunlight and UV-A light was compared with that obtained without irradiation. Role of particle size on photocatalytic decontamination of HD was also investigated. Decontamination efficiency was found to decrease when particle size was increased from 11 nm to 1000 nm. TiO2 nanoparticles of similar to 11 nm size of anatase phase exhibited superior decontamination properties relative to larger ones. 100% of HD was decontaminated on their surface within 6 h with irradiation of light. Without irradiation only 24.7% of HD was found to be decontaminated. GC-MS data indicated decontamination of HD to acetaldehyde, carbon dioxide, sulfur mustard sulfoxide, thiodiglycol, acetic acid, etc. due to photocatalysis. Without irradiation only hydrolysis products of HD like thiodiglycol were observed to be formed. (C) 2011 Elsevier B.V. All rights reserved.