The cation exchange membrane was prepared by co-deposition of Dopamine(DA)and Polyethyleneimine(PEI)based on mussel bionic binders,and its properties were characterized by infra-red spectrometer,scanning electron microscope,and UV visible spectrophotometer.The effect of DA to PEI concentration ratio on the performance of the modified membrane was studied.The results showed that with the increase of PEI concentration,the selective permeability and membrane resistance in-creased first and then decreased,while the oxidation percentage of the modified membrane decreased first and then increased.When the concentration ratio of DA to PEI was 1:1,the modified membrane had lower oxidation percentage and membrane resistance.Accordingly,the water content and ion exchange capacity were 48.68％ and 2.49 mmol/g,respectively,and the selective permeability was up to 97.8％,that is 8.08％ superior to the original membrane.
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