Titanium dioxide photocatalysis to decompose isopropyl methylphosphonofluoridate (GB) in gas phase

Photocatalytic performance of highly amorphous titania–silica aerogels with mesopores: The adverse effect of the in situ adsorption of some organic substrates during photodegradation

“…The photocatalytic removal of a variety of organic pollutants from water and air is well studied. [2,3,4,5,6]The photocatalytic reactions of natural TiO 2 are driven only by UV photons and the activity of anatase is higher than that of rutile. [3,7] The universal sol-gel processcan be appliedto prepare different, porous TiO 2 composites.…”

Designing Oxide Aerogels With Enhanced Sorptive and Degradative Activity for Acute Chemical Threats

“…Despite this promise, TiO 2 surfaces still mainly drive hydrolytic, stoichiometric degradation of organophosphorus compounds, although efforts underway seek to activate other degradation pathways and enhance active site turnover. Oxidative degradation pathways can be initiated, delaying deactivation by exciting the semiconducting bandgap of TiO 2 (Trubitsyn and Vorontsov, 2005;Sato et al, 2011;Hirakawa et al, 2013;Komano et al, 2013) or by creating metal||TiO 2 heterojunctions with supported metal nanoparticles (Panayotov and Morris, 2008;Ratliff et al, 2009). Gold nanoparticles supported on TiO 2 drive degradation of organophosphorus compounds, including complete oxidation of DMMP, by activating O 2 species at the Au||TiO 2 interface (O 2 -) (Panayotov and Morris, 2008).…”

“…While TiO 2 performs as a reactive adsorbent (Trubitsyn and Vorontsov, 2005;Panayotov and Morris, 2009a;Panayotov and Morris, 2009b;Winter et al, 2009), a photocatalyst (Trubitsyn and Vorontsov, 2005;Sato et al, 2011;Hirakawa et al, 2013;Komano et al, 2013), and a metal support for degradation of CW agents (Panayotov and Morris, 2008;Ratliff et al, 2009), DeSario and co-workers developed composite TiO 2 aerogels that incorporate these multiple functions into a single platform. Figure 9A illustrates the synthesis of Cu/TiO 2 aerogels through photodeposition, with inset transmission electron micrographs showing the highly porous network structure.…”

Photocatalytic activity of TiO2-embedded fluorinated transparent coating for oxidation of hydrosoluble pollutants in turbid suspensions

“…In the presence of water and oxygen, hydroxyl radicals OH • (redox potential OH • /H 2 O = +2.27 eV vs. the SHE) and superoxide ions O 2 −• (redox potential O 2 /O 2 −• = −0.28 eV vs. the SHE) are generated [5]. These radicalic intermediates are strong oxidizing species able to oxidize organic compounds [6,7]. In addition, it has been demonstrated that Ti IV OH • + takes an active part in the mineralization reaction [3,8,9].…”