ORIENTAL JOURNAL OF CHEMISTRY www.orientjchem.org An International Open Access, Peer Reviewed Research Journal ISSN: 0970-020 X CODEN: OJCHEG 2018, Vol. 34, No.(6): Pg. 2884-2894 This is an Open Access article licensed under a Creative Commons license: Attribution 4.0 International (CC- BY). Published by Oriental Scientific Publishing Company © 2018 Adsorption Isotherms Study of Methylene Blue Dye on Membranes from Electrospun Nanofibers WEDAD J. FENDI and JUMAN A. NASER* University of Baghdad/College of Education for Pure Science-Ibn Al-Haitham, Department of Chemistry, Baghdad, Iraq. *Corresponding author E-mail: juman_chem@yahoo.com http://dx.doi.org/10.13005/ojc/340628 Received: September 24, 2018; Accepted: October 10, 2018) ABSTRACT P-cresol formaldehyde resin was prepared and characterized by FTIR technique, then composited with polystyrene in order to produce electrospun nanofiber membrane by the electrospinning method. Zinc oxide nanoparticles was prepared and characterized by FTIR, XRD SEM and EDX techniques in order to modified first membrane. Both prepared nanofiber membranes characterized by SEM and EDX techniques and used as adsorbents to adsorb methylene blue dye from their aqueous solutions. The factors of adsorption were investigated, contact time, initial concentration, adsorbent dosage, ionic strength and temperature. The adsorption isotherms described by Langmuir and Freundlich models. So, thermodynamic functions ∆G, ∆H and ∆S of adsorption were estimated. Keywords: Adsorption, Nanofiber, Membrane, Methylene blue dye, Electrospinning. INTRODUCTION The water toxicity resulting from contamination with synthetic dyes is a major threat to human health, the sustainability of living resources and ecosystems 1 . Methylene blue MB is the most common dye used in the wood, cotton and silk industry. It causes eye burns and may be responsible for an eternal eye injury. Its inhalation can lead to rapid or slow breathing while ingestion by mouth produces a sensation of burning which causes nausea, vomiting, excessive sweating, mental confusion and methemoglobinemia 2,3 . Thus, attention should be focused on treatment of the wastewater containing methylene blue dye. Various techniques were used to treat the problem of synthetic dyes pollution such as precipitation, extraction, coagulation, filtration, flotation, oxidation, adsorption, ion exchange, reverse osmosis and photo-catalytic degradation 4-9 . Adsorption is one of the most effective and economic methods which applied for treatment wastewater. Different types of classical adsorbents were used for the removing of pollutants from wastewater such as activated carbons, clays, zeolites and polymers etc 10-14 . In principle, several types of nanomaterials were used as adsorbents to remove heavy metal ions and organic pollutants