▎ 摘　　要

NOVELTY - Modifying ZIF-8 (zeolitic imidazolate framework)/GO nanosheet by modification reagent involves calcining ZIF-8/GO nanosheet in an air atmosphere or an inert atmosphere. The calcined ZIF-8/GO nanosheets are dispersed in the first solvent, and modified reagents are added to prepare them through chemical modification reaction. USE - ZIF-8/GO composite film is used for preparing ion selective membrane used in chemical separation, energy conversion and sensing field. ADVANTAGE - The method produces product which has adjustable surface properties of the ZIF-8/GO composite film and wide application value in the field of ion selective transmission. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. a method for preparing ZIF-8/GO nanosheet, which involves: a. adding graphene oxide, zinc nitrate hexahydrate and 2-methylimidazole to the second solvent respectively to obtain a graphene oxide dispersion, zinc nitrate hexahydrate solution and 2-methylimidazole solution; b. adding the zinc nitrate hexahydrate solution into the graphene oxide dispersion, then adding the 2-methylimidazole solution and mixing evenly to obtain a precursor mixed solution; c. reacting the precursor mixture at a certain temperature for a period of time to obtain a ZIF-8/GO suspension, then centrifuging the suspension, washing, and drying to obtain a product; and 2. a ZIF-8/GO composite film, which comprises ZIF-8/GO composite film is uniformly dispersed ZIF-8/GO nanosheets modified by the modification reagent, suction-filtering obtained filtrate onto a polymer membrane substrate or a positive alumina template after being soaked in water or methanol, and then drying.