Abstract. Solvent-resistant nanofiltration (SRNF) is a promising technology which developed rapidly in recent years, which exhibits broader application prospects in separation of industries organic solvent system. Among various materials used for SRNF-membranes, graphene-based nanomaterials have aroused great interests due to the unique molecular sieve properties and excellent tolerance to organic solvents and harsh chemical environments. This paper emphatically introduces the progresses of membrane preparation with graphene-based nanomaterials for SRNF and their application in separation processes. The performances including permeability and stability of different kinds of graphene-based SRNF membranes in the process of filtration are also evaluated and discussed.
IntroductionMembrane processes are typical advanced technology for selective separation and play an important role in water and wastewater treatment [1]. Among them, nanofiltration membranes usually show high performance in the rejection of bivalent and polyvalent ions under low operation pressure [2]. As we know, the amount of chemicals in the modern world and the conventional intensive energy in separation processes have caused the total quantity of energy for chemical products separation to be astonishing, accounted for 10-15% of the world's total energy consumption [3]. To deal with the multifarious and massive organic solution in practical applications, the solvent-resistant nanofiltration (SRNF) membranes with high permeability and stability are highly desirable [4][5][6].In general, an ideal SRNF membrane should have the following characteristics: (1) high solvent flux and separation performance in organic solvent system; (2) high separation efficiency and structural stability during long-time operation; (3) the synthesized SRNF membranes are suitable for wide solvent separation in industrial application [7]. In recent years, in order to achieve SRNF membranes with high permeability and stability, many nanomaterials including graphene, Mxene, metal-organic frameworks (MOFs) have been applied to fabricate SRNF membranes [8]. Among these nanomaterials, MOFs often exhibit a poor chemical stability and more suitable for use in gas barrier applications [9][10][11][12][13]. Compared with MOFs, grapheme-based materials have attracted numerous
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