ALKALI-METAL IONS INSERTION/EXTRACTION REACTIONS WITH HOLLANDITE-TYPE MANGANESE OXIDE IN THE AQUEOUS-PHASE
ALKALI-METAL IONS INSERTION/EXTRACTION REACTIONS WITH HOLLANDITE-TYPE MANGANESE OXIDE IN THE AQUEOUS-PHASE
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DOI：
10.1021/cm00049a023
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发表时间：
1995-01-01
影响因子：
8.6
通讯作者：
OOI, K
中科院分区：
文献类型：
--
作者：
FENG, Q;KANOH, H;OOI, K
采用LiMnO 4与Mn 2+在H2SO 4溶液中反应，直接合成了H+型锰氧化物（HolMO）。采用化学分析、X射线衍射、差热-热重分析、红外光谱、pH滴定和K-d测定等方法研究了碱金属离子与HolMO的嵌入/萃取反应。碱金属离子的插入/提取通过两种不同的机制：氧化还原型和离子交换型反应。提出了一个插入/拔出反应的模型。对于碱金属和碱土金属离子的吸附，该锰氧化物显示出离子筛性质（离子筛的有效孔半径为1.41埃）。
H+-form hollandite-type manganese oxide (HolMO) was prepared directly by reacting LiMnO4 with Mn2+ in H2SO4 solution. The insertion/extraction reactions of alkali metal ions with HolMO were investigated by chemical, X-ray, DTA-TG analyses, FT-IR spectroscopy, pH titration, and K-d measurements. The alkali metal ions were inserted/extracted by two different mechanisms: redox-type and ion-exchange-type reactions. A model for the insertion/extraction reactions was proposed. The hollandite-type manganese oxide showed an ion-sieve property (the effective pore radius of the ion sieve is 1.41 Angstrom) for the adsorption of alkali and alkaline earth metal ions.