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Reactive adsorption and photodegradation of soman and dimethyl methylphosphonate on TiO2/nanodiamond composites
Czech Acad Sci, Inst Inorgan Chem, Husinec Rez 25068, Czech Republic;JE Purkyne Univ Usti Nad Labem, Fac Environm, Kralova Vysina 7, Usti Nad Labem 40096, Czech Republic.
Czech Acad Sci, Inst Phys, Cukrovarnicka 10, Prague 16200 6, Czech Republic.
Mil Res Inst, Velarska 230, Brno 63700, Czech Republic.
Czech Acad Sci, Inst Inorgan Chem, Husinec Rez 25068, Czech Republic;JE Purkyne Univ Usti Nad Labem, Fac Environm, Kralova Vysina 7, Usti Nad Labem 40096, Czech Republic.
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2019 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 259, article id UNSP 118097Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
ELSEVIER , 2019. Vol. 259, article id UNSP 118097
Keywords [en]
Titanium dioxide, Nanodiamond, Nanocomposites, Photocatalysis, Chemical warfare agents
National Category
Materials Chemistry Physical Chemistry Materials Engineering Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-395711DOI: 10.1016/j.apcatb.2019.118097ISI: 000488308800069OAI: oai:DiVA.org:uu-395711DiVA, id: diva2:1365633
Funder
Swedish Research Council, 2016-05904Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-11-20

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Mattsson, AndreasÖsterlund, Lars

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