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Guanidinium-Functionalized Nanofiltration Membranes Integrating Anti-fouling and Antimicrobial Effect


Biofouling, as one of membrane foulings, is the major obstacle limiting the application of polyamide (PA) thin-film composite (TFC) nanofiltration (NF) membrane in reclamation of wastewaters and treatment of industrial fluids. Herein, we introduced a facile and effective strategy for the modification of traditional PA-TFC NF membrane to improve water permeability and biofouling resistance. Specifically, three reactive guanidine molecules were successfully bonded onto the surface of PA-TFC membrane using chemical reactions between amine groups of guanidine and the residual acyl chloride groups on the nascent PA-TFC membrane. The covalent attachment of guanidines can significantly enhance water permeability without compromising salts rejection. For instance, for 2 g L-1 Na2SO4 aqueous solution, the water flux of NFM2 increased from 25.2 L m-2 h-1 to 68.4 L m-2 h-1 at 25 °C and 0.6 MPa compared to the traditional piperazine (PIP)-trimesoyl chloride (TMC) membrane, while Na2SO4 rejection maintained around 98.3%. Moreover, the membranes were endowed with easy-cleaning property, which can remarkably prevent foulants adhesion, with the water flux recovery ratio being as high as 98.9%. The developed TFC membranes also showed excellent anti-adhesive and antimicrobial activities against Gram-negative Escherichia coli K12 (E. coli), Gram-positive Bacillus pumilus LDS33 (B.pumilus) and Aspergillus parasiticus JFS (A. parasiticus). Therefore, the resultant guanidinium-functionalized NF membranes which have integrated high permselectivity and superior fouling resistance properties are promising materials for fabricating new generation of anti-fouling/antimicrobial surfaces that are applicable to many applications such as water desalination, softening and wastewater treatment.

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Publication details

The article was received on 11 Jan 2018, accepted on 07 Mar 2018 and first published on 08 Mar 2018

Article type: Paper
DOI: 10.1039/C8TA00342D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Guanidinium-Functionalized Nanofiltration Membranes Integrating Anti-fouling and Antimicrobial Effect

    H. Zhang, Y. Gao and J. Gai, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00342D

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