Samia Mezhr Merdas - College of Science, University of Thi-Qar, Iraq
Wed Al-Graiti - College of Dentistry, University of Thi-Qar, Thi-Qar, Iraq
Aliaa Shakir Abd Al-Ameer - College of Science, University of Thi-Qar, Iraq

The PVA@WNS composite has been successfully prepared by attaching the polyvinyl alcohol and Walnut shell powder with (۱:۱) 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 (R۲= ۰.۹۳۳) is better than the Freundlich model (R۲= ۰.۹۲۵) which implies that the MB adsorption on PVA@WNS composite was monolayer. Thus, qmax calculated from the Langmuir model was found to be ۵.۹۳۸ mg.g−۱ 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.

Methylene blue, WNS, Composite, Batch absorption, حhysisorbed