Green and eco-friendly adsorption of dyes with organoclay: isothermal, kinetic and thermodynamic studies

摘要

The present study comprises the surfactant-based modified adsorbents as inorgano-organo composites for the removal of dyes. It was depicted that 0.05 g of modified clay could be efficiently used to adsorb >90% of dye (100 mg/L). The kinetic models (pseudo-first order, pseudo-second order, intraparticle diffusion model) and isothermal models (Langmuir, Freundlich, Temkin) were also studied to examine the adsorption mechanism. Pseudo second-order kinetic model and Langmuir isothermal model fitted well with adsorption of dyes. The thermodynamic (Delta G degrees, Delta H degrees and Delta S degrees) parameters were also studied and negative value of (Delta G degrees) and positive value of (Delta S degrees) indicates the spontaneity of adsorption.