화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.30, No.1, 172-180, January, 2013
DOI10.1007/s11814-012-0113-1  Export Citation
Characterization of Ag(I), Co(II) and Cu(II) removal process from aqueous solutions using dolomite powder
Ahad Ghaemi†, Meisam Torab-Mostaedi1, Shahrokh Shahhosseini, and Mehdi Asadollahzadeh1
  • Department of Chemical Engineering, Iran University of Science and Technology, P. O. Box 16765-163, Tehran, Iran
  • 1Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 14155-1339, Amirabad, Tehran, Iran
E-mail:
Dolomite, a natural adsorbent, was used for removal of Ag(I), Cu(II) and Co(II) from aqueous solutions. Adsorption parameters including pH, temperature and contact time have been investigated to obtain adsorption mechanism. The results of experiments showed that adsorption of the metal ions increased by increasing pH values up to 5.5. The adsorption process was initially fast. Equilibrium isotherm data were analyzed using Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. Maximum adsorption capacity of Ag(I), Cu(II) and Co(II) was 1.34, 1.63 and 2.84 mg/g at 20 ℃, respectively. Kinetic models including Lagergren first-order and pseudo-second-order were used to test kinetic data. The results showed that pseudo-second-order has good agreement with experimental data. Thermodynamic parameters of the process were also investigated at different temperatures. The negative values of Gibbs free energy and enthalpy changes for Ag(I), Cu(II) and Co(II) indicated the spontaneous and exothermic nature of the adsorption process.
Keywords:Dolomite;Ag(I);Cu(II);Co(II);Adsorption Isotherm
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