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 : 11 | Download : 5

Publication Date : 2021-12-31

Article Type : Research Paper

Abstract :This study investigates the adsorption of neutral red insert ignore into journalissuearticles values(NR); on the natural clayey material of Adilcevaz/ Bitlis located the northwest of Van Lake in Eastern Anatolia insert ignore into journalissuearticles values(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