A novel nanocofitration membrane was prepared with SPES owning excellent performance by manual coating method. The tetrabutyl titanate and the TiO2 nanoparticles were utilized to modify the separation performance. Meanwhile

the microstructure and permeability of NaCl and dye of the original and mixed matrix membrane were measured to evaluate the effect of the additive on the nanofiltration membrane performance. The permeate flux of the mixed matrix membrane fabricated by casting solution with a TBT concentration of 0.35% (mass) raised from 27.3 L·m-2·h-1 to 38.9 L·m-2·h-1

and the rejection of the NaCl of reduced from 91.2% to 82.5%. Compared with neat SPES membrane

modified membrane owned a bigger pore size

enlarging form 1.51 nm to 2.28 nm. Due to the addition loadings increasing

the nanoparticles obtained from gradually hydrolyzing could integrate

increased and formed further larger nanoparticles. The tetrabutyl titanate used as additive could improve the flux of the mixed matrix membrane and reduce the defect leaded by TiO2 nanoparticles agglomeration. The butanol gained form the tetrabutyl titanate hydrolysis could also increase quantity of the pores on the neat SPES membrane skin layer and have an important influence on the separation performance of the mixed matrix membrane.