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• W3134732170 endingPage "12561" @default.
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• W3134732170 abstract "Multifunctional composites that couple high-capacity adsorbents with catalytic nanoparticles (NPs) offer a promising route toward the degradation of organophosphorus pollutants or chemical warfare agents (CWAs). We couple mesoporous TiO2 aerogels with plasmonic Cu nanoparticles (Cu/TiO2) and characterize the degradation of the organophosphorus CWA sarin under both dark and illuminated conditions. Cu/TiO2 aerogels combine high dark degradation rates, which are facilitated by hydrolytically active sites at the Cu||TiO2 interface, with photoenhanced degradation courtesy of semiconducting TiO2 and the surface plasmon resonance (SPR) of the Cu nanoparticles. The TiO2 aerogel provides a high surface area for sarin binding (155 m2 g–1), while the addition of Cu NPs increases the abundance of hydrolytically active OH sites. Degradation is accelerated on TiO2 and Cu/TiO2 aerogels with O2. Under broadband illumination, which excites the TiO2 bandgap and the Cu SPR, sarin degradation accelerates, and the products are more fully mineralized compared to those of the dark reaction. With O2 and broadband illumination, oxidation products are observed on the Cu/TiO2 aerogels as the hydrolysis products subsequently oxidize. In contrast, the photodegradation of sarin on TiO2 is limited by its slow initial hydrolysis, which limits the subsequent photooxidation. Accelerated hydrolysis occurs on Cu/TiO2 aerogels under visible illumination (>480 nm) that excites the Cu SPR but not the TiO2 bandgap, confirming that the Cu SPR excitation contributes to the broadband-driven activity. The high hydrolytic activity of the Cu/TiO2 aerogels combined with the photoactivity upon TiO2 bandgap excitation and Cu SPR excitation is a potent combination of hydrolysis and oxidation that enables the substantial chemical degradation of organophorphorus compounds." @default.
• W3134732170 created "2021-03-15" @default.
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• W3134732170 date "2021-03-03" @default.
• W3134732170 modified "2023-10-02" @default.
• W3134732170 title "Photoenhanced Degradation of Sarin at Cu/TiO₂ Composite Aerogels: Roles of Bandgap Excitation and Surface Plasmon Excitation" @default.
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• W3134732170 doi "https://doi.org/10.1021/acsami.0c21988" @default.
• W3134732170 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33656870" @default.
• W3134732170 hasPublicationYear "2021" @default.
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