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        Regulating surface-pore structure of PES UF membrane by addition of ‘‘active” nano-CaCO3

        Mantong Gao,Shenghuan Wang,Yanhong Ji,Zhengyu Cui,Feng Yan,Mohammad Younas,Jianxin Li,Benqiao He 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

        A small surface-pore ultrafiltration membrane with a high surface porosity was fabricated from a polyethersulfone (PES) dope solution containing a small quantity of CaCO3 nanoparticles (nano-CaCO3),which coagulated in dilute HCl solution. During membrane formation, CO2 nanobubbles were in-situ generatedto delay phase inversion, which ameliorated the membrane structure and performance becauseCO2 nanobubbles are amphiphobic to water and solvent. With increasing nano-CaCO3 content (from 0to 0.15%) in the dope solution, the surface porosity and the surface-pore density of the obtained PESUF membrane were markedly increased from 1.76 to 6.50% and from 8.31 1014 to 5.08 1015 m2,respectively. Nonetheless, the surface-pore size decreased from 13.35 to 8.29 nm, and so as the distribution. The optimal membrane exhibited a high pure water flux (698.2 Lm2h1) and a high rejection tobovine serum album (>99%) with a moderate anti-fouling ability. This work would be of great significancefor precision separation in biopharmaceutical, food processing, and other related applications.

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