Functionalized graphene oxide based membranes for ultrafast molecular separation

• Published in: Separation and purification technology Vol. 274; p. 117969
• Main Authors: Ahmed Janjhi, Farooque, Chandio, Imamdin, Ali Memon, Ayaz, Ahmed, Zubair, Hussain Thebo, Khalid, Ali Ayaz Pirzado, Azhar, Ali Hakro, Ayaz, Iqbal, Muzaffar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2021
• Subjects: Graphene oxide; Membrane; Permeance; Rejection, dyes; Rejection, dyes; Membrane; Permeance; Graphene oxide
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2020.117969

Green method have been used for fabrication of Graphene oxide/ Ginger extractive based lamellar membranes. Such membranes showed exellence selectvity of dye molecules (˃99%) in both aqeous and organic medium with extraordinary stability. [Display omitted] •Graphene oxide / Ginger extractive (GO/GE) based lamellar membranes were prepared using green route.•GO/GE membranes exhibited ultrafast permeability for DI water (permeance ∼ 420 ± 10 Lm-2h-1bar−1).•Such membranes showed an excellent selectivity for several organic dyes up to ∼ 100% for methyl blue.•As-prepared laminates were used for organic separation and exhibits excellent rejection toward rhodamine B up to ˃98%•Those laminates are highly stable under aqueous environment up to ∼ 70 days. Graphene oxide (GO) has attracted an enormous attention for membrane-based technology in wastewater treatment due to its supreme properties such as two-dimensional (2D) structure, good chemical and mechanical stabilities, and high antifouling. However, due to presence of several functional groups on its basal plane and edge, which hinder its applications in wastewater treatment. Herein, we prepared GO-based lamellar membranes from GO and ginger plant extractive (GE) with various thicknesses (∼280 ± 20 nm, ∼500 ± 30 nm, ∼780 ± 30 nm and ∼ 1130 ± 30 nm) by using vacuum filtration method. The GO/GE lamellar membrane (∼280 ± 10 nm) showed an excellent separation efficiency for various organic dyes with ultrafast permeability i.e. rhodamine B (RB, Rejection 99 ± 1% and permeance 320 ± 10 Lm-2h-1bar−1) and methyl blue (MB, Rejection 99 ± 1% and permeance 210 ± 10 Lm-2h-1bar−1). Further, the GO/GE lamellar membrane also shows high water permeance ∼ 420 ± 10 Lm-2h-1bar−1. In addition, these membranes also used for organic separation and results show good separation efficiency of dye molecules in organic solvent (methanol) and exhibited high rejection (˃98%) for both RB and MB dye. This high separation efficiency against several dye molecules with good permeance and stability enlighten the great potential of our GO/GE lamellar membranes in water purification, desalination and other nanofiltration applications.