▎ 摘　　要

NOVELTY - Preparing composite modified expand graphene, comprises taking quantitative natural crystalline flake graphite as raw material for expandable graphite preparation at a certain temperature, soaking in cetyltrimethylammonium bromide-potassium bromide composite modifier solution, water washing, drying, expanding to obtain composite modified expand graphene, cetyltrimethylammonium bromide, potassium bromide concentration is 0.02-0.12 mol/l, 0.05-0.2 mol/l, the solvent is alcohol, and water, the ratio of expandable graphite and solution is 1:0.1-1:0.5. USE - The composite modified expand graphene is used in printing and dyeing waste water treatment, and printing and dyeing static adsorption (claimed), and printing and dyeing wastewater purification. ADVANTAGE - The method realizes low expansion temperature, and saves energy. The composite modified expand graphene has increased surface active sites, is loaded with rich surface functional groups, and can absorb variety of dyes. DETAILED DESCRIPTION - Preparing composite modified expand graphene, comprises taking quantitative natural crystalline flake graphite as raw material for expandable graphite preparation at a certain temperature, soaking in cetyltrimethylammonium bromide-potassium bromide composite modifier solution, water washing, drying, expanding to obtain composite modified expand graphene, cetyltrimethylammonium bromide, potassium bromide concentration is 0.02-0.12 mol/l, 0.05-0.2 mol/l, the solvent is alcohol, and water, the ratio of expandable graphite and solution is 1:0.1-1:0.5, the soaking temperature is 30-80 degrees C, soaking time is 5-8 hours, expanding device is low temperature furnace and muffle furnace.