Graphene oxide(GO)-basedultrathinhybridmembraneswiththicknesseslessthan115nmwere
fabricated vialayer-by-layer(LbL)self-assemblydrivenbymultipleinteractions.Gelatin(GE)andGO
werealternatelydepositedonhydrolyzedpolyacrylonitrile(H-PAN)ultrafiltration membranesthrough
electrostatic attraction,hydrogenbond,andhydrophobicinteractiontoobtainhybridmultilayer
membranes. TheincorporationofGOfavoredthecoverageofnanoporesonH-PANmembrane,which
greatlyreducedtherequireddepositioncyclesforacceptablepermselectivityofmembrane,andthen
simplified themembrane-fabricationprocedure.EnhancedthermalstabilityofGEmoleculeswas
obtained foras-fabricatedhybridmultilayermembranescomparedwithGE/H-PANpristinemembrane.
In membraneseparationexperiments,thehybridmultilayermembraneachievedsynchronousenhance-
ment inpermeation flux andseparationfactorforpervaporationdehydrationofethanolaqueous
solution incomparisonwithGE/H-PANpristinemembrane.ThepHvalueof4.0wasdeterminedasthe
optimal conditionofself-assemblyprocessintermsofseparationperformance.Theoptimized
separation performanceofhybridmultilayermembraneswiththebilayernumber10.5wasobtained
with thepermeation flux of2275g/m2 h andwatercontentinpermeateof98.7wt%underthe
conditions of350Kandwatercontentinfeedof20wt%.Desirableoperationstabilitywasacquiredin
the long-termmembraneseparationexperiment.