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In this paper, Polyethersulfone(PES)/multi-walled carbon nanotubes (MWCNTs) composite ultrafiltration membrane was made by phase-inversion method.Triton X-100 was used as dispersant to make the MWCNTs well dispersed in organic solvents for the preparation of homogeneous PES/MWNTs composite solutions.The surface morphology and structure of membrane were characterized by scanning electron microscopy (SEM).The effects of MWCNTs content on the pertormances of membrane were investigated, such as porosity, water flux, and anti-fouling characteristics.It shows that proper addition of MWCNTs will improve the properties of the membrane.The blend membrane could be used in the determination of illegal dyes in foods for the adsorption performance of MWCNTs to dye.