Constructing 2D ultrathin graphene oxide membranes with supramolecular-assembled nano-adhesives for enhancing water stability  

作　　者：Wei Liu Yuan Li Rujing Li Hui Xu Xinling Lu Weibing Dong Zhen Zhang Yong Wang 

机构地区：[1]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University,Tianjin 300072,China [2]School of chemistry and chemical engineering,Qinghai Nationalities University,Xining 810007,China

出　　处：《Nano Research》2023年第7期8505-8511,共7页纳米研究（英文版）

基　　金：This work was financially funded by the National Key Research and Development Program of China(No.2019YFC1905500);the National Natural Science Foundation of China(Nos.21922409 and 22274109).

摘　　要：Atomic-thick two-dimensional(2D)graphene oxide(GO)has emerged as an ideal building block in developing ultrathin 2D membranes for separating substances.However,due to the negative charge of GO sheets when hydrated,electrostatic repulsion causes GO membranes to disintegrate easily in water,limiting their wide application in aqueous solutions.Here,we introduce and apply the concept of localized gluing by designing ultra-small supramolecular-assembled nanoparticles as nanoadhesives(NPA)to construct robust GO membranes with a thickness of only 24 nm.The supramolecular-assembled NPA were synthesized by cyclodextrin(CD)and tannic acid(TA)with a uniform size distribution of about 4.5 nm,and exposed surface pyrogallols that could strongly interact with GO sheets.The physical sizing of the NPA confines the interlayer spacing and maintains the nanochannel,while the natural molecular properties of the NPA enhance the connection between adjacent layers and inhibit swelling detachment.The fabricated ultrathin 2D membranes show a remarkable two times enhancement of water permeance over pristine GO membranes and exhibit excellent durability with record-breaking stability for 720 h immersion in water.This strategy provides meaningful insights into the design and fabrication of robust ultrathin membranes for practical application.

关 键 词：graphene oxide membranes supramolecular assembly nano-adhesives aqueous stability water purification 

分 类 号：TB383[一般工业技术—材料科学与工程]