Guanidinium-Functionalized Nanofiltration Membranes Integrating Anti-fouling and Antimicrobial Effect
作者：Hong-Li Zhang, Yu-Bing Gao, Jing-Gang Gai*
關鍵字：Guanidinium-Functionalized，Nanofiltration Membranes， Anti-fouling，Antimicrobial
論文來源：期刊
具體來源：J. Mater. Chem. A, 2018, 6(15): 6442-6454.
發表時間：2018年
Biofouling, as one of the membrane foulings, is the major
obstacle limiting the application of polyamide (PA) thin-film composite (TFC) nanofiltration (NF) membranes 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 membranes
to improve water permeability and biofouling resistance. Specifically, three reactive guanidine molecules were successfully
bonded onto the surface of PA-TFC membranes using chemical reactions between
the 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 salt
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 around 98.3%. Na2SO4
rejection was
maintained. Moreover, the membranes were endowed with easy-cleaning properties,
which can remarkably prevent foulant 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 a new generation of anti-fouling/antimicrobial
surfaces that are applicable to many applications such as water desalination
and softening and wastewater treatment.