Application of Sepiolite-Poly(vinylimidazole) composite for the removal of Cu(II): Thermodynamics and isotherm studies


Tekin N. , Kara A., Kılıç M., Dinibütün N., Şafaklı A.

International Journal of Chemistry and Technology, cilt.2, ss.20-33, 2018 (Diğer Kurumların Hakemli Dergileri)

  • Cilt numarası: 2 Konu: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.32571/ijct.341542
  • Dergi Adı: International Journal of Chemistry and Technology
  • Sayfa Sayısı: ss.20-33

Özet

For removal of Cu(II) ions from aqueous solutions, a novel composite was prepared from 1-vinyl imidazole and sepiolite by the technique of in-situ polymerization. Adsorption of Cu(II) ions onto Sepiolite-Poly(vinylimidazole) composite prepared has been studied at 277338 K and the experimental data were analyzed using various isotherm models. The Langmuir and the Toth models procured the best fit to the experimental data of the adsorption among the two-parameter and three-parameter models, respectively. The adsorption equilibrium was reached in 3 h and the optimum pH for the adsorption was found to be 5. Adsorption isotherm modeling showed that the interaction between adsorbate and adsorbent is localized to monolayer adsorption. Maximum adsorption capacity (qm) calculated from Langmuir isotherm was found to be 261.91 mg g−1 at 250C. The calculated thermodynamic parameters indicated an endothermic adsorption process. The composite is thought to be a promising adsorbent for the removal of Cu(II) ions.