- Communications Faculty of Sciences University Ankara Series B Chemistry and Chemical Engineering
- Vol: 63 Issue: 1
- Adsorption of neutral red dye from aqueous solutions by natural adsorbent: an equilibrium, kinetic a...
Adsorption of neutral red dye from aqueous solutions by natural adsorbent: an equilibrium, kinetic and thermodynamic study
Authors : Ali Rıza Kul, Eda Gökirmak Söğüt, Necla Çalişkan Kiliç
Pages : 27-60
View : 7 | Download : 3
Publication Date : 2021-12-31
Article Type : Research
Abstract :This study investigates the adsorption of neutral red (NR) on the natural clayey material of Adilcevaz/ Bitlis located the northwest of Van Lake in Eastern Anatolia (Turkey). The adsorbent used was characterized by XRD, XRF, FTIR, SEM and TG-DTA analyzes. The effect of various parameters such as pH, contact time, initial concentration and temperature on NR removal was investigated using a batch process to optimize the maximum adsorption conditions. Equilibrium data for NR adsorption were analyzed using nonlinear two-parameter isotherms such as Langmuir, Freundlich, Dubinin-Radushkevich, and Tempkin, and three-parameter isotherm models, such as nonlinear Redlich-Peterson, Sips, and Koble-Corrigan. The modelling results showed that it was best adapted to the Freundlich isotherm model for the NR dye, with relatively higher R 2 values and smaller S.E. The maximum adsorption capacity obtained from the experimental data was determined to be 4.2810 mg g -1 . The adsorption process follows pseudo-second-order kinetics with a rate constant of 0.0110 g mg -1 min -1 . The thermodynamic parameters indicate that a physical mechanism controls the NR adsorption on the natural clay and spontaneously occurs.Keywords : Adsorption, dye, natural clay, non-linear isotherm models, thermodynamic, kinetic