Sunlight assisted photocatalytic detoxification of sulfur mustard on vanadium ion doped titania nanocatalysts

Photoenhanced Degradation of Sarin at Cu/TiO2 Composite Aerogels: Roles of Bandgap Excitation and Surface Plasmon Excitation

“…Like Cu/TiO 2 aerogels, native TiO 2 aerogels also display enhanced GB degradation under BB irradiation, indicating that the bandgap excitation of TiO 2 does contribute to the enhanced activity under BB illumination. This is consistent with other observations of UV-driven OP degradation. ,,,,, However, photoenhanced degradation is even more pronounced for Cu/TiO 2 , which reaps the benefits of superior dark activity combined with photoenhancement. Photodegradation of OP CWAs on the TiO 2 surface is mediated by the generation of hydroxyl radicals and superoxide anions .…”

“…This is consistent with other observations of UV-driven OP degradation. ,,,,, However, photoenhanced degradation is even more pronounced for Cu/TiO 2 , which reaps the benefits of superior dark activity combined with photoenhancement. Photodegradation of OP CWAs on the TiO 2 surface is mediated by the generation of hydroxyl radicals and superoxide anions . The activating Cu||TiO 2 interface can provide an activated species that quenches the photogenerated charge carriers to generate a radical species that drive the degradation.…”

“…Among the metal oxides, TiO 2 has displayed some of the most promising degradation activity. The full thermal degradation of the CWA sarin (GB) has been demonstrated or predicted on TiO 2 surfaces, and the photoenhanced degradation of OP agents − or simulants ,− has also been achieved. However, solar-driven applications for photocatalytic CWA degradation by TiO 2 are limited by its large bandgap (3.2 eV for anatase and 3.0 eV for rutile).…”

“…Due to the risks involved in working with live chemical agents, most investigations into the binding and degradation of CWAs at surfaces rely on theoretical simulations or utilize chemical mimics (i.e., simulants). Unfortunately, the reactivity and adsorption of simulants are not necessarily well-correlated with those of the live agent. − In contrast, fewer studies detail the behavior of live CWAs, and even fewer describe the photodegradation of agents. − , Plasmonic-enhanced degradation of OP CWAs is not without precedent, but the only reports to date utilize plasmonic Au; ,, at present, no reports describe the use of nonprecious plasmonic materials. We monitor the binding and degradation of GB on Cu/TiO 2 and TiO 2 aerogel surfaces in an in situ infrared reactor and determine how the degradation pathways differ in both O 2 -free and O 2 -rich reaction streams.…”

“…43−48 In contrast, fewer studies detail the behavior of live CWAs, and even fewer describe the photodegradation of agents. [16][17][18][19][20][21][22][23][24][25]49 Plasmonic-enhanced degradation of OP CWAs is not without precedent, but the only reports to date utilize plasmonic Au; 16,19,23 at present, no reports describe the use of nonprecious plasmonic materials. We monitor the binding and degradation of GB on Cu/TiO 2 and TiO 2 aerogel surfaces in an in situ infrared reactor and determine how the degradation pathways differ in both O 2 -free and O 2 -rich reaction streams.…”