Removal of Cadmium (II) from aqueous solution by zinc oxide nanoparticles: kinetic and thermodynamic studies

被引：26
作者：
Khezami, L. [1 ]
Taha, Kamal K. [1 ,2 ]
Amami, Ezzeddine [3 ]
Ghiloufi, Imed [4 ,5 ]
El Mir, Lassaad [4 ,5 ]
机构：
[1] Al Imam Mohammad Ibn Saud Islamic Univ IMSIU, Coll Sci, Dept Chem, Riyadh 11432, Saudi Arabia
[2] Univ Bahri, Coll Appl & Ind Sci, Khartoum, Sudan
[3] Univ Tunis El Manar, Res Unit Mat Chem & Environm, Higher Inst Appl Biol Sci Tunis ISSBAT, 9 St Zouhair Essafi, Tunis 1006, Tunisia
[4] Al Imam Mohammad Ibn Saud Islamic Univ IMSIU, Coll Sci, Dept Phys, Riyadh 11432, Saudi Arabia
[5] Gabes Univ, Lab Phys Mat & Nanomat Appl Environm LaPhyMNE, Fac Sci, Gabes, Tunisia
来源：
DESALINATION AND WATER TREATMENT | 2017年 / 62卷
关键词：
ZnO nanoparticles; Cadmium removal; Adsorption kinetic and equilibrium; ACTIVATED CARBON; CD(II) REMOVAL; METAL-IONS; ADSORPTION; PB(II); WATER; DYE; EQUILIBRIUM; SORPTION; SYSTEMS;
D O I：
10.5004/dwt.2017.0196
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
In this study, the removal of cadmium ions by ZnO nanoparticles, prepared by a modified sol-gel method, was investigated. The kinetics, thermodynamic and equilibrium parameters of the cadmium ion adsorption on the nanomaterial were determined in batch mode experiments. The adsorption process was found to be highly concentration dependent, and the adsorption rate increased proportionally with temperature indicating an endothermic process. The kinetics of the adsorption process was found to follow the pseudo-second-order rate law. The adsorption isotherm data were in good agreement with the Langmuir model. The maximum adsorption capacity of ZnO nanoparticles for Cd(II) was found to be 217.4 mg.g(-1) at 328 K. Thermodynamic parameters revealed the endothermic and spontaneous nature of the adsorption process. Nevertheless, the global reaction rate is probably controlled by the intra-particular diffusion of Cd(II) ions.
引用
收藏
页码：346 / 354
页数：9
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