▎ 摘　　要

NOVELTY - Filtration apparatus (A1) comprises a support substrate, and a graphene oxide membrane disposed on the support substrate, where the graphene oxide membrane includes many graphene oxide sheets, each of the graphene oxide sheets covalently coupled to an adjacent graphene oxide sheet via a crosslinker. USE - The apparatus is useful for synthesizing a water purification membrane. ADVANTAGE - The apparatus utilizes the graphene oxide membrane that has high water permeability and improved selectivity for targeted contaminants, thus representing an alternative to current water separation membranes. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) filtration apparatus (A2) comprising the support substrate, and the graphene oxide membrane disposed on the support substrate, where the graphene oxide membrane includes 5-25 layers of the graphene oxide sheets, and the graphene oxide membrane has a rejection rate of 90% of disodium sulfate, as measured with a 0.1 mM disodium sulfate solution; and (2) filtration apparatus (A3) comprising the support substrate, and the graphene oxide membrane disposed on the support substrate, where the graphene oxide membrane includes 5-25 layers of graphene oxide sheets, each of the graphene oxide sheets covalently coupled to an adjacent graphene oxide sheet via monomer crosslinker.