naa a22 4500 510819036 CHVBK 20180411083522.0 cr unu---uuuuu 180411e20130101xx s 000 0 eng 10.1007/s11814-012-0113-1 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0113-1 Characterization of Ag(I), Co(II) and Cu(II) removal process from aqueous solutions using dolomite powder [Elektronische Daten] [Ahad Ghaemi, Meisam Torab-Mostaedi, Shahrokh Shahhosseini, Mehdi Asadollahzadeh] 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 oC, 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. Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Dolomite nationallicence Ag(I) nationallicence Cu(II) nationallicence Co(II) nationallicence Adsorption Isotherm nationallicence Ghaemi Ahad Department of Chemical Engineering, Iran University of Science and Technology, P. O. Box 16765-163, Tehran, Iran aut Torab-Mostaedi Meisam Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 14155-1339, Amirabad, Tehran, Iran aut Shahhosseini Shahrokh Department of Chemical Engineering, Iran University of Science and Technology, P. O. Box 16765-163, Tehran, Iran aut Asadollahzadeh Mehdi Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 14155-1339, Amirabad, Tehran, Iran aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 172-180 0256-1115 30:1<172 2013 30 11814 https://doi.org/10.1007/s11814-012-0113-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0113-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ghaemi Ahad Department of Chemical Engineering, Iran University of Science and Technology, P. O. Box 16765-163, Tehran, Iran aut NATIONALLICENCE 700 1- Torab-Mostaedi Meisam Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 14155-1339, Amirabad, Tehran, Iran aut NATIONALLICENCE 700 1- Shahhosseini Shahrokh Department of Chemical Engineering, Iran University of Science and Technology, P. O. Box 16765-163, Tehran, Iran aut NATIONALLICENCE 700 1- Asadollahzadeh Mehdi Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, P. O. Box 14155-1339, Amirabad, Tehran, Iran aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/1(2013-01-01), 172-180 0256-1115 30:1<172 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer