Using PVA@WNS Composite as Adsorbent for Methylene Blue Dye from Aqueous Solutions

Abstract

The PVA@WNS composite has been successfully prepared by attaching the polyvinyl alcohol and Walnut shell powder with (1:1) ratio from plant and has been analyzed by using FT-IR, SEM, and AFM, and then it was used as an adsorbent of methylene blue dye from synthetic wastewater. The adsorption of MB dye on the PVA@WNS composite was studied as a function of contact time and concentration. Isotherm adsorption was also described by the Langmuir and Freundlich models. It was found that Langmuir isotherm (R2= 0.933) is better than the Freundlich model (R2= 0.925) which implies that the MB adsorption on PVA@WNS composite was monolayer. Thus, qmax calculated from the Langmuir model was found to be 5.938 mg.g−1 and was consistent with the experimental data. The synthesized PVA@WNS composite showed an excellent activity towards the removal of methylene blue from synthetic wastewater.