Evaluating Forest Waste on Adsorption of Cd(II) from Aqueous Solution: Equilibrium and Thermodynamic Studies
Handan Ucun Özel 1  
Betül Tuba Gemici 1  
Halil Barış Özel 2  
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Bartin University, Faculty of Engineering, Department of Environmental Engineering, Kutlubey Campus, Bartin, Turkey
Bartin University, Faculty of Forestry, Department of Forest Engineering, Agdaci Campus, Bartin, Turkey
Betül Tuba Gemici   

Bartın Üniversity Department of Environmental Engineering, 74100, Bartin, Turkey, Bartın University, Department of Environmental Engineering, 74100 Bartin, Turkey
Online publish date: 2019-05-07
Submission date: 2018-07-13
Final revision date: 2018-09-18
Acceptance date: 2018-10-07
The aim of this work was to investigate the adsorption potential of Uludag fir (Abies nordmanniana subsp. bornmülleriana Mattf.) on cadmium removal using batch experiments. The effect of parameters such as initial metal concentration, initial pH, biosorbent dosage, stirring speed, contact time and temperature was examined. The Langmuir and Freundlich models were applied to describe the equilibrium isotherms, and the biosorption process followed the Langmuir adsorption isotherms model with high coefficients of correlation at different temperatures. The kinetics of the sorption were analysed using the pseudo first-order and pseudo second-order kinetic models. The pseudo second-order kinetic model fit well in correlation with the experimental results. Moreover, the evaluated thermodynamic parameters (ΔG0, ΔH0, ΔS0) showed that the sorption process was feasible, spontaneous and endothermic in nature. This study showed that Uludag fir (Abies nordmanniana subsp. bornmülleriana Mattf.) can be used as an effective and ecologically friendly biosorbent for removal of Cd(II) from aqueous solutions.