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

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• 作者：Kota S. Subrahmanyam ; Christos D. Malliakas ; Debajit Sarma ; Gerasimos S. Armatas ; Jinsong Wu ; Mercouri G. Kanatzidis
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：137
• 期：43
• 页码：13943-13948
• 全文大小：409K
• ISSN：1520-5126

文摘

We report the synthesis of ion-exchangeable molybdenum sulfide chalcogel through an oxidative coupling process, using (NH₄)₂MoS₄ and iodine. After supercritical drying, the MoS_x 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鈥?/sup> units. The optical band gap of the brown-black chalcogel is 鈭?.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.}