Removal of dye and heavy metal ion using a novel synthetic polyethersulfone nanofiltration membrane modified by magnetic graphene oxide/metformin hybrid

Abstract

In this research, active groups of biguanide were grafted to the surface of graphene oxide sheets through covalent functionalization and combined with magnetic nanoparticles to produce a magnetic graphene-based composite (MMGO). Then, the fabricated MMGO hybrid was introduced into the polyethersulfone (PES) polymer through phase inversion induced by immersion precipitation method. The prepared MMGO embedded PES membranes were examined for pure water flux permeability, salt rejection, antifouling, copper removal, and dye retention capability. The effect of MMGO hybrid on the cross-sectional morphology, hydrophilicity, and roughness of the PES membrane was investigated as well. Embedding MMGO hybrid was eventuated in a significant increase in the pure water flux because of changes in surface roughness and hydrophilicity of the membranes. Besides, the copper and dye removal capability of the prepared membranes remarkably raised due to the presence of hydrophilic functional groups on the surface of MMGO hybrid. The fabricated nanofiltration membrane with 0.5 wt % MMGO hybrid had the highest affinity for copper ions removal (92%). Dye rejection of the MMGO embedded PES membranes at different concentrations of MMGO hybrid was almost the same (about 99%) while the value of the bare PES membrane was 91%. Flux reduction of the MMGO embedded PES membranes was lower than that of the bare PES membrane during repeated filtration.

Preparation of a novel zwitterionic striped surface thin-film composite nanofiltration membrane with excellent salt separation performance and antifouling property

“…In an antifouling membrane, advanced materials (such as silica spheres, 8 nanoparticles, [9][10][11][12] hydrophilic polymers, [13][14][15] metallics 16,17 as well as some functional carbon materials 18,19 ) play an important role. Recently, polyphenol tannic acid (TA) has been widely used in membrane fabrication because of its abundance in plant tissue 20 and versatility for membrane synthesis.…”

Investigation on the Adsorption-Interaction Mechanism of Pb(II) at Surface of Silk Fibroin Protein-Derived Hybrid Nanoflower Adsorbent

“…Various treatment techniques-such as chemical reduction [10], biological conversion [11], membrane separation [12,13], and adsorption treatment [14]-have been developed and applied to remove HMIs during the past decades. With obvious advantages of high efficiency, cost-effectiveness and simple operation, adsorption technology has been regarded as one of the most effective and competitive methods for HMIs treatment [15][16][17][18].…”

Preparation of stable and superior flux GO/LDH/PDA‐based nanofiltration membranes through electrostatic self‐assembly for dye purification

“…Modern industry has built a colorful world, but the subsequent dye wastewater pollution has become a global problem that needs to be solved urgently, which seriously damage the human health and natural ecological environment. Advanced science and technologies have brought about various novel methods for wastewater treatment, including membrane separation technology, ion exchange, photocatalytic degradation, electrochemical method, biochemical method, and so on. Among them, membrane separation technology has been certified to be one of the most promising candidates for water purification because of the merits of high efficiency, easy operation, and low costs .…”

“…In recent years, graphene oxide (GO) has triggered significant attention as a new type of self‐assembly membrane material attribute to possess a unique honeycomb two‐dimensional (2D) sheet‐like structure, large surface area, hydrophilicity, flexibility, and chemical stability . Furthermore, a range of actively functional groups like hydroxyl, epoxide, and carboxyl groups distribute on defects and edges, which can adsorb aromatic organic contaminants and heavy metal ions . More than this, the 2D nanochannels between self‐assembly GO flakes can provide pathways for water permeation .…”

“…[12][13][14][15][16] Furthermore, a range of actively functional groups like hydroxyl, epoxide, and carboxyl groups distribute on defects and edges, which can adsorb aromatic organic contaminants and heavy metal ions. 4,[17][18][19] More than this, the 2D nanochannels between self-assembly GO flakes can provide pathways for water permeation. 20,21 Unfortunately, the self-assembly GO-based membrane is extremely unstable when immersed in aqueous solution because of the electrostatic repulsive forces between the hydroxyl, carbonyl, and epoxy groups on the GO nanosheets.…”