Amine-functionalized metal organic framework@graphene oxide as filler in PAEK-containing carboxyl group membrane for ultrafiltration with ultra-high permeability and strong fouling resistance

Achieving high fouling resistance and permeability using membrane separation technology in water treatment processes remains a challenge. In this work, a novel mixed matrix membrane (PAEK-COOH/UiO-66-NH2@GO) with superb fouling resistance and high permeability was prepared by the nonsolvent induced phase separation method, by in-situ growth of UiO-66-NH2 on graphene oxide (GO) layer, and by preparing hydrophilic poly(arylene ether ketone) (PAEK) containing carboxyl groups (PAEK-COOH). On the basis of the structure and performance analysis of the mixed matrix membrane (MMMs), the maximum water flux reached 591.25 L·m–2·h–1 for PAEK-COOH/UiO-66-NH2@GO, while the retention rate for bovine serum albumin increased from 85.40% to 94.87%. As the loading gradually increased, the hydrophilicity of the MMMs increased, significantly enhancing their fouling resistance. The strongest anti-fouling ability observed was 94.74%, which was 2.02 times greater than that of the pure membrane. At the same time, the MMMs contained internal amide and hydrogen bonds during the preparation process, forming a cross-linked structure, which further enhanced the mechanical strength and chemical stability. In summary, the MMMs with high retention rate, strong permeability, and anti-fouling ability were successfully prepared.