Coagulation of colloidal manganese dioxide by divalent cations

被引：12

作者：

Perez-Benito, JF ^{[1
]}

机构：

[1] Univ Barcelona, Fac Quim, Dept Quim Fis, E-08028 Barcelona, Spain

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2003年 / 225卷 / 1-3期

关键词：

colloid coagulation; divalent cations; equilibrium constants; L-histidine; manganese dioxide;

D O I：

10.1016/S0927-7757(03)00321-2

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：

The coagulation of colloidal MnO2 by several divalent cations, both in the absence and presence of a complexing ligand (L-histidine), has been studied. The efficiency as coagulating agents increases in the order Mg2+ < Ni2+ < Zn2+ < Cu2+ <Co2+ < Mn2+. For a given cation, the coagulating efficiency increases with increasing pH and with increasing temperature, and decreases with increasing concentration Of L-histidine. Apparent values for the equilibrium constants of complexation of divalent cations by L-histidine have been obtained. The apparent equilibrium constant of formation of the complex increases in the order Mg2+ < Mn2+ < Zn2+ <Cu2+ < Ni2+. The value corresponding to Co2+ could not be determined because L-histidine acted as a catalyst for the reduction of colloidal MnO2 by that cation. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：145 / 152

页数：8

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