多巴胺非共价改性碳纳米管超滤膜的制备及抗污染性能

利用多巴胺(DA)的自聚合特性对多壁碳纳米管(MWCNT)进行非共价改性,制备了多巴胺改性碳纳米管超滤膜(PDA/MWCNT),并对其抗污染性能进行了系统研究.采用X射线光电子能谱、傅里叶红外光谱、接触角测量仪和扫描电镜对PDA/MWCNT膜进行亲水性和化学组成的表征.选取大肠杆菌菌液为目标污染物,研究了不同改性条件对PDA/MWCNT膜抗污染性能及抗蛋白黏附能力的影响.结果表明,DA成功引入到MWCNT表面.DA与MWCNT交联时间为5h、DA浓度1g/L、MWCNT负载量2.17mg/cm²时,MWCNT膜的接触角由改性前112.79°降至8.4°.改性后PDA/MWCNT膜表面的氧元素含量为改性前的2.9倍,膜的亲水性得到显著改善.膜通量较改性前提高1倍,膜的抗污染性能、抗菌性及抗蛋白黏附能力得到显著提高,错流冲洗后的膜通量恢复率从56.62%增加到88.74%.

Preparation and antifouling performance of dopamine non - covalently functionalized carbon nanotube ultrafiltration membranes

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.