posted on 2022-08-10, 23:40authored byYuan Zhou, Yuanzhang Jiang, Yong Zhang, Lin Tan
Through etherification reaction, epoxy propyl dimethyl
dodecyl
ammonium chloride (EPDMDAC) was grafted onto the surface of a cellulose
acetate (CA) membrane to prepare a stable nonleaching antibacterial
antifouling membrane (QCA-X). The results showed
that with the extension of grafting reaction time, the quaternary
ammonium salt groups on the membrane surface increased and the hydrophilicity
was enhanced. Compared with those of the CA membrane, the filtration
capacity and antifouling performance of the QCA-X membrane are improved. When the grafting time is 4 h, the water
permeability and flux recovery rate of the QCA-4 membrane are increased
by 139 and 21.5%, respectively. The QCA-X membrane
showed excellent antibacterial performance, and the sterilization
rate against S. aureus and E. coli was more than 99.99%. After four repeated
antibacterial cycles, the bactericidal rates against S. aureus and E. coli were maintained at about 99.69 ± 0.02 and 99.98 ± 0.02%,
respectively, with good antibacterial persistence. Moreover, the QCA-X membrane can effectively inhibit bacterial adhesion. Mild
and simple EPDMDAC grafting modifications improve the antibacterial,
antifouling, and antibioadhesion properties of the CA membrane, showing
its application potential in long-term water treatment, especially
in biofouling water treatment.