Preparation of High Surface Porosity Polysulfone Ultrafiltration Membranes by Nanobubble-assisted Phase Inversion
In this paper,trace amounts of nano-CaCO3were added to polysulfone(PSf)casting solution to make it undergo phase inversion in a hydrochloric acid coagulation bath,and nano-CaCO3 reacted with HC1 to generate CO2 nanobubbles to regulate the membrane structure,and the high surface porosity PSf ultrafiltration membrane was successfully prepared by nanobubble-assisted phase inversion method(BNIPS).The results indicate that the addition of trace amounts of nano-CaCO3 in the PSf casting solution can significantly regulate the structure and properties of the membrane.When the amount of nano-CaCO3 added was only 0.05%,the separation pore size of the obtained PSf ultrafiltration membrane(M-0.05)reaches 12.8 nm,and the surface porosity reaches 7.4%,the pure water flux of M-0.05 membrane reached 916.6 L/m2/h,and the bovine serum albumin(BSA)rejection exceeds 97%,showing high permeability and high selectivity.