Abstract：Dopamine (DA) was used to non-covalently functionalize multi-walled carbon nanotube (MWCNT) which were then used to prepare dopamine non-covalently functionalized MWCNT ultrafiltration membranes for examining the antifouling ability of PDA/MWCNT membrane in this study. The hydrophilicity and chemical composition of the PDA/MWCNT membrane were characterized with X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, contact angle detection instrument, and scanning electron microscope. E. coli was selected as the target pollutant to evaluate impacts of different functionalized conditions on the antifouling and antiprotein adhesion ability of PDA / MWCNT membrane. The results demonstrate that DA could be successfully introduced onto the surface of MWCNT. Under the cross-linking time of 5h, DA concentration of 1g/Land MWCNT dosage of 2.17mg/cm2, the contact angle of PDA/MWCNT membrane decreased from its original 112.79° to 8.4°. The content of oxygen element on the surface of the PDA/MWCNT membrane was 2.9 times that on MWCNT membrane, implying a significant improvement in the hydrophilicity of PDA/MWCNT membrane. The flux of PDA/MWCNT membrane was twice as high as MWCNT membrane’s. The antifouling, antibacterial and antiprotein adhesion ability of PDA/MWCNT membrane were all significantly improved, and the flux recovery rate was increased from 56.62% to 88.74% after cross flow flushing.
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