Solar light decomposition of warfare agent simulant DMMP on TiO2/graphene oxide nanocomposites

0504449 - ÚACH 2020 RIV GB eng J - Journal Article
Henych, Jiří - Mattsson, A. - Tolasz, Jakub - Štengl, Václav - Österlund, L.
Solar light decomposition of warfare agent simulant DMMP on TiO2/graphene oxide nanocomposites.
Catalysis Science &Technology. Roč. 9, č. 8 (2019), s. 1816-1824. ISSN 2044-4753. E-ISSN 2044-4761
Grant - others:NATO(US) SPS984599; AV ČR(CZ) MSM200321601
Program: Science for Peace and Security; Program na podporu mezinárodní spolupráce začínajících výzkumných pracovníků
Institutional support: RVO:61388980
Keywords : dimethyl methylphosphonate * reactive adsorption * graphene oxide * anatase TiO2 * organophosphorus pesticides * trimethyl phosphate * cerium oxide
OECD category: Inorganic and nuclear chemistry
Impact factor: 5.721, year: 2019
Method of publishing: Limited access
https://pubs.rsc.org/en/content/articlelanding/2019/CY/C9CY00059C#!divAbstract

Solar light-induced photodecomposition of organophosphorus warfare agent simulant dimethyl methylphosphonate (DMMP) on the surfaces of TiO2/graphene oxide (GO) nanocomposites was studied by in situ DRIFT spectroscopy. Nanocomposites containing 1 and 2 wt% GO, respectively, were prepared by two different aqueous methods. All nanocomposites were shown to effectively adsorb and partly dissociate DMMP as shown by the formation of surface coordinated methoxy groups. Solar light illumination induced rapid decomposition of the adsorbed species to yield various ionic and surface coordinated formate and carbonate species as the main intermediate products. Both the kinetics of adsorbed species decomposition and the formation of various intermediates were strongly affected by the presence of GO, as compared to pure TiO2 nanoparticles. The two synthesis routes yielded nanocomposites with different degrees of reduction of GO that correlated with their reactivity towards DMMP adsorption and photodegradation. Upon illumination, rapid depletion of water was observed on the TiO2/GO nanocomposites and was attributed to a water splitting reaction, which competed with the DMMP photo-oxidation reaction.
Permanent Link: http://hdl.handle.net/11104/0296078