The invention relates to a preparation method of a PVA (
Polyvinyl Acetate) / PEI (
Polyethylenimine)-T
nanofiber membrane capable of specifically adsorbing mercury ions. The preparation method comprises the following steps of: (1) dissolving
thymine-1-
acetic acid into water, adding EDC (
Ethylene Dichloride), stirring for 2-5hours to obtain a solution, then adding a PEI solution, reacting through stirring, and carrying out dialyzing and
freeze drying to obtain PEI-T; and (2) mixing a PVA
aqueous solution and the PEI-T to obtain a
polyvinyl alcohol PVA / PEI-T solution, and carrying out electrostatic
spinning,
glutaraldehyde steam crosslinking, rinsing and
vacuum drying to obtain the PVA / PEI-T
nanofiber membrane. A using method of the PVA / PEI-T
nanofiber membrane comprises the following steps of: adding a pH
buffer solution of mercuric salts into the PVA / PEI-T nanofiber membrane, carrying out adsorption under the condition of
room temperature, sampling, and testing the variation of the concentration of the mercury ions. According to the preparation method disclosed by the invention, the preparation process is simple and is easy to operate, the stability of
fiber materials water is good, the
fiber materials water is convenient to recover and is high in repeated utilization ratio, and the mercury ions have high
specific adsorption.