Reduced　graphene　oxide　(rGO)　has　been　prepared　through　hydrothermal　reduction,　an　environmentally　safe　reduction　of　graphene　oxide　(GO).　rGO　is　used　to　fabricate　a　highly　compatible　and　orderly　stacked　lamellar　structure　of　composite　membranes　with　chitosan　(CS).　This　method　also　facilitates　a　continuous　large-scale　fabrication　of　membranes.　Conventionally,　GO　and　CS　are　the　preferred　compounds　for　this　type　of　fabrication　because　of　their　hydrophilic　nature.　Nevertheless,　when　they　are　mixed　together,　the　occurrence　of　ionic　complexation　(-COO-H3+N-R)　between　the　negatively　charged　carboxylate　ions　of　GO　and　the　positively　charged　protonated　amines　of　CS　create　extreme　membrane　aggregation.　Hydrothermal　reduction　is　useful　for　preventing　undesired　ionic　complexation　from　mixing　rGO　and　CS　because　it　can　remove　most　carboxylate　ions　from　GO.　Consequently,　the　hydrophilic　CS　molecular　chain　is　inserted　in　between　the　rGO　laminates,　improving　the　dispersion　and　enabling　the　rGO/CS　to　stack-up　and　self-assemble　into　a　lamellar　structure.　Furthermore,　excellent　methanol　dehydration　can　be　observed　through　pervaporation,　which　is　attributed　to　the　selective　water　channels　formed　in　the　rGO　laminates.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.