Remediation and recovery of methyl orange from aqueous solution onto acrylic acid grafted Ficus carica fiber: Isotherms, kinetics and thermodynamics

► Acrylic acid grafted Ficus carica fiber was used to remove azo dyes. ► The adsorption equilibrium was represented with different isotherm models. ► Adsorption of methylene orange followed intraparticle diffusion model. ► The adsorbent is abundant in nature, inexpensive and biodegradable.