Equilibrium, kinetic and thermodynamic studies of Pb(II) adsorption from aqueous solutions on HCl-treated Egyptian kaolin

被引:81
作者
Drweesh, Sayed A. [1 ]
Fathy, Nady A. [2 ]
Wahba, Mohammed A. [1 ]
Hanna, Adli A. [1 ]
Akarish, Adel I. M. [3 ]
Elzahany, Eman A. M. [1 ]
El-Sherif, Iman Y. [4 ]
Abou-El-Sherbini, Khaled S. [1 ]
机构
[1] Natl Res Ctr, Dept Inorgan Chem, 33 El Bohouth St Former Eltahrir St,PO 12622, Giza, Egypt
[2] Natl Res Ctr, Dept Phys Chem, 33 El Bohouth St Former Eltahrir St,PO 12622, Giza, Egypt
[3] Natl Res Ctr, Dept Geol, 33 El Bohouth St Former Eltahrir St,PO 12622, Giza, Egypt
[4] Natl Res Ctr, Dept Water Pollut Res, 33 El Bohouth St Former Eltahrir St,PO 12622, Giza, Egypt
来源
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2016年 / 4卷 / 02期
关键词
Pb(II); Adsorption; Kaolin; Thermodynamics; Kinetics;
D O I
10.1016/j.jece.2016.02.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
HCl activated (HK) and untreated (UnK) Egyptian (Sinai) kaolin were characterized. The adsorption parameters of Pb(II) on UnK and HK were examined in aqueous solutions. The equilibrium adsorption data were described using Langmuir and Freundlich adsorption isotherm models. The monolayer adsorption capacities were 34.5 and 23.8 mg g (1) at pH 5.5 and 25 degrees C for the HK and UnK, respectively. The experimental data fitted well the pseudo-second-order kinetics model. The thermodynamic parameters standard Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy changes (Delta S degrees) for the adsorption process were calculated. The negative value of the Gibbs free energy confirms that the adsorption processes are spontaneous and thermodynamically favorable while the positive value of Delta H degrees supports the endothermic physical adsorption process. HK was applied successfully for removing Pb(II) (67.5-99.3%) from spiked water samples and >98% of the loaded Pb(II) ions was recovered by 1 mol L (1) HNO3. The successful removal of Pb(II) from the studied water samples indicates that HK can be used efficiently for pollution remediation of fresh water from lead. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1674 / 1684
页数:11
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