Influence of kinetics on the determination of the surface reactivity of oxide suspensions by acid-base titration

被引：16
|
作者：
Duc, M. [1 ]
Adekola, F. [1 ]
Lefevre, G. [1 ]
Fedoroff, M. [1 ]
机构：
[1] Univ Paris 06, CNRS, UMR 7575, ENSCP,Lab Electrochim & Chim Analyt, F-75231 Paris 05, France
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2006年 / 303卷 / 01期
关键词：
acid-base titration; surface charge; oxides; titration kinetics; surface acid-base constants; surface complexation;
D O I：
10.1016/j.jcis.2006.07.029
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 effect of acid-base titration protocol and speed on pH measurement and surface charge calculation was studied on suspensions of gamma-alumina, hematite, goethite, and silica, whose size and porosity have been well characterized. The titration protocol has an important effect on surface charge calculation as well as on acid-base constants obtained by fitting of the titration curves. Variations of pH versus time after addition of acid or base to the suspension were interpreted as diffusion processes. Resulting apparent diffusion coefficients depend on the nature of the oxide and on its porosity. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码：49 / 55
页数：7
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