期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 137, 期 43, 页码 13943-13948出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b09110
关键词
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资金
- NEUP grant from the Department of Energy, Office of Nuclear Energy
- UOP Company
- Indo-US Science & Technology Forum (IUSSTF)
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- DOE Office of Science [DE-AC02-06CH11357]
We report the synthesis of ion-exchangeable molybdenum sulfide chalcogel through an oxidative coupling process, using (NH4)(2)MoS4 and iodine. After supercritical drying, the MoSx amorphous aerogel shows a large surface area up to 370 m(2)/g with a broad range of pore sizes. X-ray photoelectron spectroscopic and pair distribution function analyses reveal that Mo6+ species undergo reduction during network assembly to produce Mo4+-containing species where the chalcogel network consists of [Mo3S13] building blocks comprising triangular Mo metal clusters and S-2(2-) units. The optical band gap of the brown-black chalcogel is similar to 1.36 eV. The ammonium sites present in the molybdenum sulfide chalcogel network are ion-exchangeable with K+ and Cs+ ions. The molybdenum sulfide aerogel exhibits high adsorption selectivities for CO2 and C2H6 over H-2 and CH4. The aerogel also possesses high affinity for iodine and mercury.
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