Thermodynamic studies of Ni(II) adsorption onto bentonite from aqueous solution

被引：242
|
作者：
Tahir, SS [1 ]
Rauf, N [1 ]
机构：
[1] Pakistan Environm Protect Agcy, Cent Lab Environm Anal, Islamabad, Pakistan
来源：
JOURNAL OF CHEMICAL THERMODYNAMICS | 2003年 / 35卷 / 12期
关键词：
adsorption; thermodynamics; nickel; langmuir; freundlich; D-R isotherms; enthalpy; entropy; Gibbs free energy;
D O I：
10.1016/S0021-9614(03)00153-8
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The adsorption behavior of Ni(II) onto bentonite was studied as a function of temperature under optimized conditions of shaking time, amount of adsorbent, pH, and concentration of the adsorbate. Thermodynamic parameters such as DeltaH(degrees), DeltaS(degrees), and DeltaG(degrees) were calculated from the slope and intercept of the linear plot of 1gK(D) against 1/T. Analysis of adsorption results obtained at T = (298, 303, 313, and 323) K showed that the adsorption pattern on bentonite followed the Langmuir, Freundlich, and D-R isotherms. A flame atomic absorption spectrophotometer was used for measuring the concentration of Ni(II). (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2003 / 2009
页数：7
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