A new type of manganese oxide (MnO2•0.5H2O) derived from Li1.6Mn1.6O4 and its lithium ion-sieve properties

被引：216

作者：

Chitrakar, R ^{[1
]}

Kanoh, H ^{[1
]}

Miyai, Y ^{[1
]}

Ooi, K ^{[1
]}

机构：

[1] Shikoku Natl Ind Res Inst, Takamatsu, Kagawa 7610395, Japan

来源：

CHEMISTRY OF MATERIALS | 2000年 / 12卷 / 10期

关键词：

D O I：

10.1021/cm0000191

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new type of adsorbent, MnO(2 .)0.5H(2)O, was synthesized from Li1.6Mn1.6O4 followed by acid treatment. The hydrothermal reaction of monoclinic type gamma -MnOOH with LiOH solution at 120 degreesC resulted in a H+/Li+ ion exchange, giving orthorhombic LiMnO2. The orthorhombic LiMnO2 was transformed to cubic Li1.6Mn1.6O4 (Li2Mn2O5) at a temperature higher than 400 degreesC. The conversion of Li1.6Mn1.6O4 to MnO(2 .)0.5H(2)O by acid treatment resulted in contraction of the lattice constant ao from 8.14 to 8.05 Angstrom with little dissolution of manganese. The new adsorbent showed a markedly high ion-exchange capacity (7.5 mmol/g) for lithium ions due to its ion-sieve property. The pH titration study suggested the formation of large numbers of uniform sorption sites having relatively high acidity. The uptake of Li+ ions from lithium-enriched seawater was found to be 5.3 mmol/g (37 mg/g), which is the maximum among the adsorbents studied to date.

引用

页码：3151 / 3157

页数：7

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