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The optimum conditions for the adsorption process were obtained by observing the influences of solution pH, adsorbent dosage, initial solution concentration, contact time and temperature. The optimum adsorption efficiencies were determined at pH 2.8 and pH 4.0 for Fe(III) and Cr(III) metal ion solutions, respectively. The experimental data were modelled by different isotherm models and the equilibriums were well described by the Langmuir adsorption isotherm model. The pseudo-first-order, pseudo-second-order kinetic, intra-particle diffusion and Elovich models were applied to analyze the kinetic data and to evaluate rate constants. The pseudo-second-order kinetic model gave a better fit than the others. The thermodynamic parameters, such as Gibbs free energy change \u0394G\u00b0, standard enthalpy change \u0394H\u00b0 and standard entropy change \u0394S\u00b0 were evaluated. The thermodynamic study showed the adsorption was a spontaneous endothermic process.<\/jats:p>","DOI":"10.2166\/wst.2015.504","type":"journal-article","created":{"date-parts":[[2016,2,1]],"date-time":"2016-02-01T11:06:23Z","timestamp":1454324783000},"page":"423-436","update-policy":"https:\/\/doi.org\/10.2166\/iwapcrossmarkpolicypage","source":"Crossref","is-referenced-by-count":44,"title":["Comparative studies on adsorptive removal of heavy metal ions by biosorbent, bio-char and activated carbon obtained from low cost agro-residue"],"prefix":"10.2166","volume":"73","author":[{"given":"\u00c7isem","family":"K\u0131rb\u0131y\u0131k","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering, Selcuk University, 42079 Konya, Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ay\u015fe Eren","family":"P\u00fct\u00fcn","sequence":"first","affiliation":[{"name":"Department of Chemical Engineering, Anadolu University, 26480 Eski\u015fehir, 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