Amorphous K-Co-Mo-S x Chalcogel: A Synergy of Surface Sorption and Ion-Exchange.

Autor: Nie J; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA., Islam T; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA., Roy SC; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA., Li D; Savannah River National Laboratory, Aiken, SC, 29808, USA., Amin R; Electrification & Energy Infrastructure Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Taylor-Pashow K; Savannah River National Laboratory, Aiken, SC, 29808, USA., Zhu X; Department of Civil Engineering, Jackson State University, Jackson, MS, 39217, USA., Feng R; Canadian Light Source, Saskatoon, Saskatchewan, S7N2V3, Canada., Chernikov R; Canadian Light Source, Saskatoon, Saskatchewan, S7N2V3, Canada., Pramanik A; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA., Han FX; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA., Kumbhar AS; Chapel Hill Analytical and Nanofabrication Laboratory (CHANL) &, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA., Islam SM; Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, Jackson, MS, 39217, USA.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (32), pp. e2400679. Date of Electronic Publication: 2024 Mar 15.
DOI: 10.1002/smll.202400679
Abstrakt: Chalcogel represents a unique class of meso- to macroporous nanomaterials that offer applications in energy and environmental pursuits. Here, the synthesis of an ion-exchangeable amorphous chalcogel using a nominal composition of K 2 CoMo 2 S 10 (KCMS) at room temperature is reported. Synchrotron X-ray pair distribution function (PDF), X-ray absorption near-edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) reveal a plausible local structure of KCMS gel consisting of Mo 5+ 2 and Mo 4+ 3 clusters in the vicinity of di/polysulfides which are covalently linked by Co 2+ ions. The ionically bound K + ions remain in the percolating pores of the Co-Mo-S covalent network. XANES of Co K-edge shows multiple electronic transitions, including quadrupole (1s→3d), shakedown (1s→4p + MLCT), and dipole allowed 1s→4p transitions. Remarkably, despite a lack of regular channels as in some crystalline solids, the amorphous KCMS gel shows ion-exchange properties with UO 2 2+ ions. Additionally, it also presents surface sorption via [S∙∙∙∙UO 2 2+ ] covalent interactions. Overall, this study underscores the synthesis of quaternary chalcogels incorporating alkali metals and their potential to advance separation science for cations and oxo-cationic species by integrating a synergy of surface sorption and ion-exchange.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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