Method for separating heavy metal ions through membrane filtration, heavy metal ion separation membrane used by method and preparation method of heavy metal ion separation membrane

The invention belongs to the technical field of separation membranes, and particularly relates to a method for separating heavy metal ions through membrane filtration, a heavy metal ion separation membrane used by the method and a preparation method. The method comprises the following steps: (1) mixing a thermoplastic polymer material and epoxy resin in proportion, stirring after irradiation, dropwise adding an aromatic hydrocarbon solution, heating and stirring to prepare a carrier; (2) mixing imidazolium salt, a metal organic crystal and a pore-forming agent in proportion to prepare a membrane casting solution; and (3) uniformly coating two surfaces of a carrier with the membrane casting solution to prepare the composite separation membrane. A skeleton structure and holes are constructed through organic functional groups and metal organic crystals, heavy metal ions remaining in the hydrogen bromide preparation process are rapidly and efficiently separated, and the separation membrane obtains excellent ion s