▎ 摘　　要

NOVELTY - The preparation of graphene purification material involves (1) adding graphene to sodium silicate solution, ultrasonically dispersing, allowing to stand to obtain mixed solution (A), (2) mixing diatomaceous earth, sepiolite powder, lithium carbonate and oxalic acid to obtain mixed solution (B), (3) mixing the mixed solutions (A) and (B), stirring to obtain mixed solution (C), ultrasonically dispersing at frequency 50-90 kHz for 30-100 minutes, drying until the water content of the mixed solution (C) is less than 5%, and grinding. USE - Preparation of graphene purification material used in adsorption of formaldehyde and harmful gases. ADVANTAGE - The method enables preparation of graphene purification material with excellent formaldehyde and other harmful gases adsorption effect, strong adsorption capacity, and is suitable for use in high humidity conditions. DETAILED DESCRIPTION - The preparation of graphene purification material involves (1) adding graphene to sodium silicate solution, ultrasonically dispersing at frequency 10-25 kHz for 10-40 minutes, where bath temperature is 24-33 degrees C, allowing to stand mixed solution for 2-6 hours to obtain mixed solution (A), (2) mixing diatomaceous earth, sepiolite powder, lithium carbonate and oxalic acid at stirring speed 400-600 rpm for 10-15 minutes to obtain mixed solution (B), (3) mixing the mixed solutions (A) and (B), stirring in high-speed stirring kettle at 2000-3000 rpm for 1-2 hours to obtain mixed solution (C), ultrasonically dispersing at frequency 50-90 kHz for 30-100 minutes, drying until water content of mixed solution (C) is less than 5%, and grinding.