Reactive adsorption and photodegradation of soman and dimethyl methylphosphonate on TiO2/nanodiamond composites

0507928 - ÚACH 2020 RIV NL eng J - Journal Article
Henych, Jiří - Stehlík, Štěpán - Mazanec, K. - Tolasz, Jakub - Čermák, J. - Rezek, B. - Mattsson, A. - Österlund, L.
Reactive adsorption and photodegradation of soman and dimethyl methylphosphonate on TiO2/nanodiamond composites.
Applied Catalysis B - Environmental. Roč. 259, DEC (2019), č. článku 118097. ISSN 0926-3373. E-ISSN 1873-3883
R&D Projects: GA ČR(CZ) GJ18-11711Y; GA MŠMT(CZ) EF16_019/0000760
Grant - others:AV ČR(CZ) MSM200321601; OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Program: Program na podporu mezinárodní spolupráce začínajících výzkumných pracovníků
Institutional support: RVO:61388980 ; RVO:68378271
Keywords : Chemical warfare agents * Nanocomposites * Nanodiamond * Photocatalysis * Titanium dioxide
OECD category: Inorganic and nuclear chemistry; Inorganic and nuclear chemistry (FZU-D)
Impact factor: 16.683, year: 2019
Method of publishing: Open access with time embargo
https://www.sciencedirect.com/science/article/pii/S0926337319308446?via%3Dihub

We report on the synthesis and characterization of TiO2/Nanodiamond (ND) nanocomposites for rapid decontamination of chemical warfare agents (CWA) and toxic industrial compounds prepared by a simple water-based, low-temperature method using urea as a homogeneous precipitating agent. The excellent water-compatibility of NDs promoted their good dispersion within the TiO2 matrix resulting in intergrown TiO2/ND nanostructures. NDs with an abundance of oxygen-containing surface moieties increased the porosity of the composites resulting in their three times more efficient spontaneous degradation of the CWA soman in solution compared to pure TiO2. In situ DRIFT spectroscopy revealed the enhanced reactive adsorption and solar light photodecomposition of dimethyl methyl phosphonate vapor on TiO2/ND. The charge transfer across TiO2/ND interfaces that hinder recombination of photo-excited electron-hole pairs was inferred from surface potential measurements. The results indicate that well-dispersed NDs forming heterojunctions together with their high porosity contribute to the reactive properties of the nanocomposites.
Permanent Link: http://hdl.handle.net/11104/0298892