ADSORPTION FROM AQUEOUS-SOLUTION BY DELTA-MANGANESE DIOXIDE .2. ADSORPTION OF SOME HEAVY-METAL CATIONS

被引：0

作者：

GRAY, MJ ^{[1
]}

MALATI, MA ^{[1
]}

机构：

[1] MEDWAY & MAIDSTONE COLL TECHNOL,CHATHAM,KENT,ENGLAND

来源：

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY | 1979年 / 29卷 / 03期

关键词：

MANGANESE COMPOUNDS - SOILS - SOLUTIONS;

D O I：

暂无

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The adsorption isotherms of M**2** plus ions (M**2** plus equals Ni**2** plus , Co**2** plus , Cd**2** plus , Zn**2** plus and Mn**2** plus ) on the K** plus -form of delta -MnO//2, at pH 6 and at different temperatures, fitted the Langmuir equation and an apparent heat of adsorption, Q, was found to be minus 78, minus 33, minus 34, minus 19 and minus 15 kJ mol** minus **1 respectively. An ion-exchange mechanism between hydrated K** plus ions in the outer Helmholtz layer and hydrated M**2** plus ions in the solution, suggests positive entropy contributions which offset the endothermic Q. The proposed mechanism is in agreement with the observed sequence of adsorption (possibly complicated by the oxidation of Co**2** plus by delta -MnO//2.

引用

页码：135 / 144

页数：10

共 28 条

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