▎ 摘　　要

NOVELTY - Hydrophobic two-dimensional nano-island/graphene heterojunction material prepared by growing two-dimensional nano-island material on the surface of graphene through catalytic reaction of oxygen groups, where the area ratio of the two-dimensional nano-island material and graphene is 10-70 wt.%, is claimed. USE - The nanofiltration membrane is useful in water treatment, which is seawater desalination treatment, industrial wastewater treatment or urban sewage treatment (claimed). ADVANTAGE - The two-dimensional nano-island/graphene heterojunction self-assembled hydrophobic nanofiltration membrane: can block various hydrated ions (including potassium ion, sodium ion, lithium ion, calcium ion and magnesium ion, etc.); can also pass through the extremely large capillary force in the two-dimensional nano-confinement to obtain ultra-high water flux; improves the ion barrier rate and water flux; and can greatly improve water treatment efficiency and reduce energy consumption when water treatment membranes. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a method for preparation of hydrophobic two-dimensional nano-island/graphene heterojunction material; and (2) method for preparing two-dimensional nano-island/graphene heterojunction self-assembled hydrophobic nanofiltration membrane by using the hydrophobic two-dimensional nano-island/graphene heterojunction material.