| Autor: |
Leonard MB; Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States.; U.S. Army Combat Capabilities Development Command Chemical Biological Center, 8198 Blackhawk Road, Aberdeen Proving Ground, Maryland 21010, United States., Li T; Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States.; Materials Department and Materials Research Laboratory, University of California, Santa Barbara, Santa Barbara, California 93106, United States., Rodriguez EE; Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States. |
| Jazyk: |
angličtina |
| Zdroj: |
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Jul 24; Vol. 16 (29), pp. 38757-38767. Date of Electronic Publication: 2024 Jul 11. |
| DOI: |
10.1021/acsami.4c07620 |
| Abstrakt: |
In an effort to develop the next frontier filtration material for chemical warfare agent (CWA) decomposition, we synthesized mesoporous NiO and Cu x Ni 1- x O ( x = 0.10 and 0.20) and studied the decomposition of CWA simulant diisopropyl fluorophosphate (DIFP) on their surfaces. Mesoporous NiO and Cu x Ni 1- x O were fully characterized and found to be a solid solution with no phase separation up to 20% copper dopant. The synthesized materials were successfully templated producing ordered mesoporous metal oxides with high surface areas (67.89- 94.38 m 2 /g). Through Raman spectroscopy, we showed that pure NiO contained a high concentration of Ni 2+ vacancies, while Cu 2+ reduced these defects. Through in situ infrared spectroscopy, we determined the surface species formed, potential pathways, and driving factors for decomposition. Upon exposure of DIFP, all materials produced similar decomposition products CO, CO 2 , carbonyls, and carbonates. However, decomposition reactions were sustained longer on mesoporous NiO, facilitated by the higher Ni 2+ vacancy concentration. NiO was further studied with DIFP, first at low dosing temperatures (-50 °C), which still resulted in the production of CO and carbonates, and then, second, with a higher pretreatment temperature, which showed the importance of terminal hydroxyls/water to fully oxidize decomposition products to CO 2 . Mesoporous NiO demonstrated high decomposition and oxidation capabilities at temperatures below room temperature, all without any external excitation or noble metals, making it a promising frontier filtration material for CWA decomposition. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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