Kinetic, Equilibrium Isotherm And Thermodynamic Study Of Adsorption Of Congo Red Dye On Low-Cost Adsorbent

The potential of masoor crop seed husk powder for the removal of congo red (CR) dye from aqueous solution was investigated. The adsorption experiments were carried out in batch techniques. The various parameters, like contact time, adsorbent dose, initial CR dye concentration and temperature were investigated. The kinetic data were analysed using pseudo-first order and pseudo-second order models. It was found that pseudo-first order kinetic model was the most appropriate model than pseudo-second order, describing the adsorption kinetics. Adsorption equilibrium was attained within 24 hr. The equilibrium data were best fitted by the Langmuir isotherm model than Freundlich model. Thermodynamic properties, like free energy (G), enthalpy (H) and entropy (S) indicated spontaneous and exothermic nature of adsorption for masoor crop seed husk powder adsorbent. The study revealed that masoor crop seed husk powder can be used as efficient adsorbents for the removal of CR dye solution.