Author/Authors :
Moradi، Omid نويسنده Department of Chemistry, Shahre-Qods Branch, Islamic Azad University, Shahre-Qods, Iran , , Mirza، Behrooz نويسنده Department of Chemistry, South Tehran Branch, Islamic Azad University, Tehran, Iran , , Norouzi، Mehdi نويسنده Hepatitis B Molecular Laboratory, Department of Virology-School of Public Health, Tehran University of Medical Sciences, Tehran, IR Iran , , Fakhri، Ali نويسنده Department of Chemistry, Shahre-Qods Branch, Islamic Azad University, Shahre-Qods, Iran ,
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 were
obtained and the results revealed that the Langmuir isotherm fitted the experiment results better than Freundlich
isotherm. Using the Langmuir model equation, the monolayer removal capacity of PHEMA surface was found to be
0.7388, 0.8396 and 3.0367 mg/g for Co(II), Cu(??) 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(??) and Pb(II) ions, respectively. Changes in the standard
Gibbs free energy (?G0), standard enthalpy (?H0) and standard entropy (?S0) 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).
