ESCA and thermodynamic studies of alkali metal ion exchange reactions on an α-MnO2 phase with the tunnel structure

文献情報

出版日 2000-03-15

DOI 10.1039/A907614J

インパクトファクター 3.676

著者

M. Tsuji, Y. Tamaura

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要旨

A manganic acid cation-exchange material with the 2×2 type tunnel structure was synthesized by decomposition of a mixture of 80 mol% MnCO3 and 20 mol% (CH3)3COK at 530°C, followed by leaching out any other residual ionic impurities using 1M HNO3. Its chemical composition was represented by H1.7Mn8O15.01. The theoretical ion exchange capacity was 2.49 mmol g−1, assuming that all the H+s are exchangeable. The binding energies of Mn 2p1/2 and Mn 2p3/2 levels were not shifted upon alkali cation exchange of this material. This is clear evidence that no redox process is associated with the cation exchange. The plot of the corrected selectivity coefficient in logarithmic scale vs. the charge fraction M was linear in a small range of the charge fraction up to 0.1. This suggests that each cation resides in a similar chemical environment at this concentration level within the tunnel. The slope was −40 for Li+/H+ exchange, −46 for Na+/H+ exchange, −108 for K+/H+ exchange, −72 for Rb+/H+ exchange, and −60 for Cs+/H+ exchange. The corrected selectivity coefficient at infinitesimal exchange increased in the order Li

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

ESCA and thermodynamic studies of alkali metal ion exchange reactions on an α-MnO2 phase with the tunnel structure

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掲載誌

Physical Chemistry Chemical Physics

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