Temperature effect on the surface charge properties of γ-Al2O3

被引：65

作者：

Mustafa, S ^{[1
]}

Dilara, B ^{[1
]}

Neelofer, Z ^{[1
]}

Naeem, A ^{[1
]}

Tasleem, S ^{[1
]}

机构：

[1] Univ Peshawar, Natl Ctr Excellence Phys Chem, Peshawar, Pakistan

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 1998年 / 204卷 / 02期

关键词：

gamma-Al2O3; potentiometric titration; point of zero charge (PZC); surface charge density;

D O I：

10.1006/jcis.1998.5572

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 comprehensive study of the surface properties of the gamma-AL(2)O(3) in KNO3 as a function of temperature was undertaken potentiometrically. Surface charge, ionization and complexation constants, and PZC were calculated from the potentiometric titration data in the temperature range 293-333 K. A difference between the PZC and CIP was observed as a result of the adsorption of NO3- ions. A simple graphical procedure based on the mass action law was used to determine the number of surface sites and equilibrium constants. Thermodynamic parameters, which showed a decrease in the role of nitrate NO3- ion in the charging mechanism of gamma-Al2O3, were also evaluated, whereas that of K+ ion increased with the increase in temperature. (C) 1998 Academic Press.

引用

页码：284 / 293

页数：10

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