Ion-Exchangeable Molybdenum Sulfide Porous Chalcogel: Gas Adsorption and Capture of Iodine and Mercury

Kota S. Subrahmanyam, Christos D. Malliakas, Debajit Sarma, Gerasimos S. Armatas, Jinsong Wu, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

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 S2 2- 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.

Original languageEnglish
Pages (from-to)13943-13948
Number of pages6
JournalJournal of the American Chemical Society
Volume137
Issue number43
DOIs
Publication statusPublished - Nov 4 2015

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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