TY - JOUR
T1 - Ion-Exchangeable Molybdenum Sulfide Porous Chalcogel
T2 - Gas Adsorption and Capture of Iodine and Mercury
AU - Subrahmanyam, Kota S.
AU - Malliakas, Christos D.
AU - Sarma, Debajit
AU - Armatas, Gerasimos S.
AU - Wu, Jinsong
AU - Kanatzidis, Mercouri G.
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/11/4
Y1 - 2015/11/4
N2 - We report the synthesis of ion-exchangeable molybdenum sulfide chalcogel through an oxidative coupling process, using (NH4)2MoS4 and iodine. After supercritical drying, the MoSx amorphous aerogel shows a large surface area up to 370 m2/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 S22- units. The optical band gap of the brown-black chalcogel is 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 H2 and CH4. The aerogel also possesses high affinity for iodine and mercury.
AB - We report the synthesis of ion-exchangeable molybdenum sulfide chalcogel through an oxidative coupling process, using (NH4)2MoS4 and iodine. After supercritical drying, the MoSx amorphous aerogel shows a large surface area up to 370 m2/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 S22- units. The optical band gap of the brown-black chalcogel is 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 H2 and CH4. The aerogel also possesses high affinity for iodine and mercury.
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U2 - 10.1021/jacs.5b09110
DO - 10.1021/jacs.5b09110
M3 - Article
C2 - 26456071
AN - SCOPUS:84953433038
SN - 0002-7863
VL - 137
SP - 13943
EP - 13948
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 43
ER -