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

Abstract

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 ($\Delta G°, \Delta H° \mathit{and} \Delta S°$) parameters were also studied and negative value of ($\Delta G°)$ and positive value of ($\Delta S°$) indicates the spontaneity of adsorption.

Keywords:

• Montmorillonite
• surfactants
• dyes
• adsorption
• optimization

Disclosure statement

No potential conflict of interest was reported by the author(s).