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Your search keyword '"Balboa, Alex"' showing total 11 results
Start Over Author "Balboa, Alex" Journal acs applied materials & interfaces
11 results on '"Balboa, Alex"'

5. Multimodal Characterization of Materials and Decontamination Processes for Chemical Warfare Protection

Author

Ebrahim, Amani M., primary, Plonka, Anna M., additional, Tian, Yiyao, additional, Senanayake, Sanjaya D., additional, Gordon, Wesley O., additional, Balboa, Alex, additional, Wang, Hui, additional, Collins-Wildman, Daniel L., additional, Hill, Craig L., additional, Musaev, Djamaladdin G., additional, Morris, John R., additional, Troya, Diego, additional, and Frenkel, Anatoly I., additional

Published
2019
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10. Photoenhanced Degradation of Sarin at Cu/TiO2Composite Aerogels: Roles of Bandgap Excitation and Surface Plasmon Excitation

Author

DeSario, Paul A., Gordon, Wesley O., Balboa, Alex, Pennington, Ashley M., Pitman, Catherine L., McEntee, Monica, and Pietron, Jeremy J.

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 TiO2aerogels with plasmonic Cu nanoparticles (Cu/TiO2) and characterize the degradation of the organophosphorus CWA sarin under both dark and illuminated conditions. Cu/TiO2aerogels combine high dark degradation rates, which are facilitated by hydrolytically active sites at the Cu||TiO2interface, with photoenhanced degradation courtesy of semiconducting TiO2and the surface plasmon resonance (SPR) of the Cu nanoparticles. The TiO2aerogel provides a high surface area for sarin binding (155 m2g–1), while the addition of Cu NPs increases the abundance of hydrolytically active OH sites. Degradation is accelerated on TiO2and Cu/TiO2aerogels with O2. Under broadband illumination, which excites the TiO2bandgap and the Cu SPR, sarin degradation accelerates, and the products are more fully mineralized compared to those of the dark reaction. With O2and broadband illumination, oxidation products are observed on the Cu/TiO2aerogels as the hydrolysis products subsequently oxidize. In contrast, the photodegradation of sarin on TiO2is limited by its slow initial hydrolysis, which limits the subsequent photooxidation. Accelerated hydrolysis occurs on Cu/TiO2aerogels under visible illumination (>480 nm) that excites the Cu SPR but not the TiO2bandgap, confirming that the Cu SPR excitation contributes to the broadband-driven activity. The high hydrolytic activity of the Cu/TiO2aerogels combined with the photoactivity upon TiO2bandgap excitation and Cu SPR excitation is a potent combination of hydrolysis and oxidation that enables the substantial chemical degradation of organophorphorus compounds.

Published
2021
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