▎ 摘　　要

NOVELTY - A graphene oxide reinforced crosslinked poly(vinyl alcohol) membrane comprises a base polymer comprising 5 wt.% polyvinyl alcohol, a filler material 0.5 wt.% graphene oxide and a crosslinker comprising 5 vol.% glutaraldehyde. USE - Graphene oxide reinforced crosslinked poly(vinyl alcohol) membrane used for pervaporation separation of tetrahydrofuran-water azeotropic mixture (claimed). ADVANTAGE - The membrane is economical and environmentally-friendly, and has excellent separation performance, and gains attention in the modern industrial scenario, especially for the wastewater treatment. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of graphene oxide reinforced crosslinked poly(vinyl alcohol) membrane, which involves (a) dissolving 5 g polyvinyl alcohol (PVA) in 95 ml distilled water and stirring the solution mechanically at 40 degrees C, (b) adding 0.5 wt.% graphene oxide (0.025 g) after sonicating at 40 degrees C with sufficient amount of distilled water, and magnetically stirring at 40 degrees C for 2 hours with PVA solution obtained in step (a), (c) cooling the homogeneous mixture obtained in step (b) to room temperature, (d) adding 5 ml 1 vol.% hydrochloric acid (1 ml hydrochloric acid in 99 ml distilled water) as a catalyst with the homogeneous mixture of step (c), followed by slowly adding 5 ml 5 vol.% glutaraldehyde (5 ml glutaraldehyde in 95 mL distilled water) and stirring magnetically for 1 hour, and ratio of glutaraldehyde and hydrochloric acid is 1:1, (e) keeping the stirred solution obtained in step (d) for 30 minutes to get rid of air bubbles, (f) after sonicating, pouring well dispersed solution of polyvinyl alcohol and graphene oxide obtained in step (e) on a clean glass plate with the aid of a casting knife in a dust-free atmosphere at room temperature, and drying in a hot air oven at 40 degrees C for 48 hours, and (g) peeling off dried graphene oxide-polyvinyl alcohol membrane obtained from step (f); (2) pervaporation separation of water from azeotropic composition of tetrahydrofuran-water mixture, which involves (a) providing feed solution in upper portion of detachable pervaporation glass cell at atmospheric pressure and room temperature, and placing graphene oxide reinforced crosslinked poly(vinyl alcohol) membrane at the lower portion of cell, (b) condensing and collecting permeate in a liquid nitrogen trap, (c) keeping the permeate at pressure of 2-4 mm/mercury with a rotary vacuum pump, and (d) obtaining water separated from the azeotropic composition of tetrahydrofuran-water mixture; and (3) apparatus for pervaporation separation of water from azeotropic composition of tetrahydrofuran-water mixture.