Highly Stable Phenolic Resin Interlinked Asymmetric 2d Laminates with Charge Gradient for Efficient Water Decolorization

Abstract

Two dimensional laminates, particularly graphene oxide laminated structures have been studied as nanofiltration membranes because of their tunable interlayer transport channels. Despite of many progresses have been achieved, it is still challenging to solve its severe swelling issue in polar solvents. Moreover, the modulation of the charge properties of the interlayer channels as well as its influence on nanofiltration performance is less reported. Herein, we design a facile strategy to interlink a stable polymer of phenolic resin layer onto asymmetric GO-based membrane that is formed by alternating assembly of large and small flakes. By such design, the membrane showed intensified charge gradient and resolved the trade-off issue among permeability, separation efficiency, and durability. The membrane showed impressive anti-swelling property , mechanical and chemical stability, which remained structural integrity after soaking in water for a month and even in strong acid under ultrasonic for more than 120 minutes. The optimal sample shows an outstanding rejection for methylene blue reaching 91.3% with high permeance of 160 L [[EQUATION]] m−2 [[EQUATION]] h−1 [[EQUATION]] bar−1 . This strategy provides a general idea for designing targeted separation membrane for charged dyes and other organic pollutants.

Keywords: Graphene oxide, Nanofiltration membranes, Phenolic resin, Charge gradient, Decolorization