کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
150885 456459 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetic and thermodynamic study of Cd(II), Co(II) and Zn(II) adsorption from aqueous solution by NiO
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Kinetic and thermodynamic study of Cd(II), Co(II) and Zn(II) adsorption from aqueous solution by NiO
چکیده انگلیسی

The kinetics of Zn(II), Co(II) and Cd(II) sorption onto NiO is studied at different temperatures (303–323 K). The applicability of the various kinetic models is tested to determine the mechanism of the sorption reaction. The kinetics of the metal ion adsorption on NiO is best described by pseudo first order model. The time required to reach the adsorption equilibrium is dependent on the temperature and nature of metal cation. The increase in the extent of the metal cation adsorption with temperature is due to the increase in number of active sites on the surface of adsorbent. The values of activation energy determined from Arrhenius equation are observed to be 43.7, 32.7 and 29.4 kJ/mol for Zn(II), Co(II) and Cd(II) respectively. The energy of activation is found to follow the trend: Zn(II) > Co(II) > Cd(II) which is parallel to selectivity shown by the NiO towards these metal ions. The thermodynamic parameters of activation indicate that Cd(II), Co(II) and Zn(II) adsorption onto the NiO is the entropy driven ion exchange mechanism.


► NiO behaves as an effective sorbent for removing Cd(II), Co(II) and Zn(II) from aqueous solution.
► The energy of activation follows the trend: Zn(II) > Co(II) > Cd(II).
► Sorption process of metal ions onto NiO is entropy driven ion exchange mechanism.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 171, Issue 3, 15 July 2011, Pages 935–940
نویسندگان
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