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Removal of Co(II), Cu(II) and Pb(II) Ions by Polymer Based 2-Hydroxyethyl Methacrylate:Thermodynamics and Desorption Studies

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Author(s): Omid Moradi | Behrooz Mirza | Mehdi Norouzi | Ali Fakhri

Journal: Iranian Journal of Environmental Health Science & Engineering
ISSN 1735-1979

Volume: 9;
Issue: December;
Start page: 1;
Date: 2012;
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Keywords: Removal | Polymeric surfaces | Langmuir isotherm | Heavy metal ions | Thermodynamics parameters

ABSTRACT
Removal thermodynamics and desorption studies of some heavy metal ions such as Co(II), Cu(II) and Pb(II) by polymeric surfaces such as poly 2-hydroxyethyl methacrylate (PHEMA) and copolymer 2-hydroxyethyl methacrylate with monomer methyl methacrylate P(MMA-HEMA) as adsorbent surfaces from aqueous single solution were investigated with respect to the changes in pH of solution, adsorbent composition, contact time and temperature in the individual aqueous solution. The linear correlation coefficients of Langmuir and Freundlich isotherms wereobtained and the results revealed that the Langmuir isotherm fitted the experiment results better than Freundlichisotherm. Using the Langmuir model equation, the monolayer removal capacity of PHEMA surface was found to be0.7388, 0.8396 and 3.0367 mg/g for Co(II), Cu(ΙΙ) and Pb(II) ions and removal capacity of P(MMA-HEMA) was found to be 28.8442, 31.1526 and 31.4465 mg/g for Co(II), Cu(ΙΙ) and Pb(II) ions, respectively. Changes in the standard Gibbs free energy (ΔG0), standard enthalpy (ΔH0) and standard entropy (ΔS0) showed that the removals of mentioned ions onto PHEMA and P(MMA-HEMA) are spontaneous and exothermic at 293–323 K. The maximum desorption efficiency was 75.26% for Pb(II) using 0.100 M HNO3, 70.10% for Cu(II) using 0.100 M HCl, 59.20% for 0.100 M HCl 63.67% Co(II).

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