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Decomposition of dimethyl methylphosphonate vapor on ultrathin-film titania photocatalytic light absorber.
Wu, Wei; Song, Haomin; Gan, Qiaoqiang; Liu, Dongxia.
Afiliação
  • Wu W; Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA.
  • Song H; Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA.
  • Gan Q; Department of Electrical Engineering, The State University of New York at Buffalo, Buffalo, NY 14260, USA. Electronic address: qqgan@buffalo.edu.
  • Liu D; Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, 20742, USA. Electronic address: liud@umd.edu.
Chemosphere ; 274: 129719, 2021 Jul.
Article em En | MEDLINE | ID: mdl-33540318
The decomposition of chemical warfare agent simulant, dimethyl methylphophonate (DMMP) vapor, was investigated on an ultrathin film titania (TiO2) photocatalytic light absorber. The light absorber contains an aluminum (Al) reflector and the TiO2 thin film with different thicknesses, sequentially deposited on a supportive glass substrate. The designed structure constructs a nanocavity that exhibits strong light absorption within the photocatalytic TiO2 ultrathin film. Thus, the intrinsic trade-off between optical absorption and charge carrier extraction efficiency, i.e., a light absorber should be thick enough to absorb the light allowable by its band gap but thin enough to allow charge carrier extraction for catalytic reactions, is conquered. The TiO2/Al light absorber significantly boosted TiO2 photocatalytic activity compared to the benchmark Aeroxide®P25 catalyst (i.e., up to 2013 times increase in reaction rate). The effects of reactant (i.e. DMMP, water and oxygen, respectively) partial pressure and reaction temperature on photocatalytic decomposition of DMMP by the ultrathin-film TiO2 photocatalytic light absorber were studied. Kinetic data of the DMMP decomposition can be described by the Langmuir-Hinshelwood model.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Compostos Organofosforados / Titânio Idioma: En Revista: Chemosphere Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Compostos Organofosforados / Titânio Idioma: En Revista: Chemosphere Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido