Applicability of Tempkin Equilibrium and Elovich Kinetics for Chemisorption of Brown HE-2G on Calendula officinalis

Calendula officinalis is a low-cost material used as adsorbent for the removal of textile dye, Brown HE-2G. The effect of pH, concentration of dyes, adsorbent dose and contact time were obtained by batch adsorption technique. The results were analyzed by adsorption isotherm models (Freundlich, Langmuir, RedlichPeterson and Tempkin). The results were in good agreement with Langmuir model and the Redlich-Peterson isotherm models. The Langmuir monolayer adsorption quantity was found to be, 76.56 mg g-1 Brown HE-2G. Pseudo-first-order, pseudo-second-order, Intraparticle diffusion and Tempkin kinetic models were used to fit the experimental data, it was well fitted into pseudo second order kinetics. FT-IR and SEM analysis have effectively supported the adsorption of Brown HE2G on the adsorbent.