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Mixed matrix membranes(MMMs)composed of sulfonated poly(ether ether ketone)(SPEEK)and amine-functionalized TiO2 submicrospheres modified with polyethyleneimine(PEI)were prepared.TiO2 submicrospheres with a particle size of about 300 nm were synthesized by sol-gel method and then modified by dopamine and PEI by a two-step method.