Abstract: In this paper，polyamide acid（PAA）solution was synthesized by 3，3′，4，4′，- bipheny ltetracarboxylic dianhydride（BPDA）and P-phenylenediamine（PPD）. ZnO and polyamic acid were mixed by solution mixing method. Then ZnO-polyimide（PI） membrane was obtained by gradient heating in muffle furnace. The surface structure，transmittance，thermal stability and crystal structure of the composite membranes were characterized by scanning electron microscopy（SEM），ultraviolet spectrophotometer（UV-Vis），thermogravimetric analyzer（TG）and X-ray diffraction analysis（XRD）. The adsorption properties of nano ZnO-PI and quantum dot ZnO-PI membrane on methyl orange were studied. The results showed that in the 4 mg/L methyl orange solution，the nano ZnO-PI membrane and the quantum dot ZnO-PI membrane had certain adsorption properties.

Key words: polyimide, ZnO, composite membrane, adsorption performance