Preparation of expanded graphite through compound modification and application of expanded graphite to printing and dyeing wastewater treatment

The invention relates to the field of preparation and application of modified expanded graphite, in particular to a method for preparing expanded graphite through CTAB-KBr compound modification and low-temperature electric furnace puffing. The method is characterized by including the following steps: soaking a certain amount of expandable graphite, which is prepared using natural flake graphite as a raw material, in a CTAB-KBr mixed solution with different concentrations of CTAB and KBr at a certain temperature; washing and drying, and then puffing using a low-temperature electric furnace to obtain modified expanded graphite. As the common low-temperature electric furnace is used to replace a muffle furnace as the puffing device, the expansion temperature is low, and energy conservation is remarkable; the expanded graphite after compound modification is increased in surface active sites, and rich surface functional groups are loaded on the surface, so that various types of dyes can be effectively adsorbed, and purification of printing and dyeing wastewater is realized.