Surface zwitterionic functionalized graphene oxide for a novel loose nanofiltration membrane
Surface zwitterionic functionalized graphene oxide for a novel loose nanofiltration membrane
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DOI：
10.1039/c5ta08024j
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发表时间：
2016-01
影响因子：
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通讯作者：
J. Zhu;M. Tian;J. Hou;Jing Wang;Jiuyang Lin;Yatao Zhang;Jindun Liu;B. Bruggen
中科院分区：
文献类型：
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作者：
J. Zhu;M. Tian;J. Hou;Jing Wang;Jiuyang Lin;Yatao Zhang;Jindun Liu;B. Bruggen
通过反向原子转移自由基聚合(RATRP)将聚甲基丙烯酸磺酸乙酯(PSBMA)接枝到氧化石墨烯(GO)表面，实现氧化石墨烯(GO)的表面两性电离。然后，通过相转化法制备了一种新型的GO-PSBMA/聚醚砜(PES)松散纳滤膜(NFM)。采用红外光谱、X射线衍射仪、透射电子显微镜、X射线光电子能谱和热重分析等手段对产物的化学组成和形貌进行了分析，证实了GO-PSBMA复合材料的合成是有利的。此外，基于扫描电子显微镜图像、水接触角、Zeta电位和污染参数，系统地研究了嵌入型GO-PSBMA纳米板对杂化膜形态和整体性能的影响。结果表明，当GO-PSBMA含量从0增加到0.22wt%时，杂化膜的水通量从6.44 L m−2 h−1 bar−1提高到11.98 L m−2 h−1 bar−1。抗污染实验表明，GO-PSBMA嵌入膜具有优良的抗污染性能：高的通量恢复率(约94.4%)和低的总通量衰减率(约0.18)。此外，由于加入了高刚性的GO，杂化膜的机械强度有了显著的提高。值得注意的是，与未改性膜相比，杂化膜对活性黑5(99.2%)和活性红49(97.2%)的截留率较高，而对二价盐的截留率较低(对Na2SO4的截留率为10%)，因此在染料/盐分离中具有良好的应用前景。
Surface zwitterionization of graphene oxide (GO) was firstly conducted by grafting poly(sulfobetaine methacrylate) (PSBMA) onto the GO surface via reverse atom transfer radical polymerization (RATRP). Then, a novel type of GO-PSBMA/polyethersulfone (PES) loose nanofiltration membrane (NFM) was constructed by mixing with modified GO composites via phase inversion. FTIR, XRD, TEM, XPS and TGA were applied to analyze the chemical composition and morphology, confirming a favorable synthesis of GO-PSBMA composites. Besides, the effect of the embedded GO-PSBMA nanoplates on the morphology and overall performance of the hybrid membranes was systematically investigated based on the SEM images, water contact angle, zeta potential, and fouling parameters. It was found that the water flux of the hybrid membrane was greatly enhanced from 6.44 L m−2 h−1 bar−1 to 11.98 L m−2 h−1 bar−1 when the GO-PSBMA content increased from 0 to 0.22 wt%. The antifouling tests revealed that the GO-PSBMA embedded membranes had an excellent antifouling performance: a high flux recovery ratio (ca. 94.4%) and a low total flux decline ratio (ca. 0.18). Additionally, the hybrid membranes exhibited a distinct advance in the mechanical strength due to the addition of highly rigid GO. Notably, compared with unmodified membranes, the hybrid membranes had a higher retention of Reactive Black 5 (99.2%) and Reactive Red 49 (97.2%), and a lower rejection of bivalent salts (10% for Na2SO4) at an operational pressure of 0.4 MPa, rendering the membranes promising for dye/salt fractionation.