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Nanocomposite Membrane with Polyethylenimine-Grafted Graphene Oxide as a Novel Additive to Enhance Pollutant Filtration Performance
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-04-26 , DOI: 10.1021/acs.est.8b00524 Lina Zhang 1, 2 , Baoliang Chen 1, 2 , Abdul Ghaffar 1, 2 , Xiaoying Zhu 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-04-26 , DOI: 10.1021/acs.est.8b00524 Lina Zhang 1, 2 , Baoliang Chen 1, 2 , Abdul Ghaffar 1, 2 , Xiaoying Zhu 1, 2
Affiliation
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Synthetic membranes often suffer ubiquitous fouling as well as a trade-off between permeability and selectivity. However, emerging materials which are able to mitigate membrane fouling and break the permeability and selectivity trade-off are urgently needed. A novel additive, GO-PEI, bearing a positive charge and hydrophilic nature was prepared by the covalent grafting of polyethylenimine (PEI) molecules with graphene oxide (GO) nanosheets, which later was blended with bulk poly(ether sulfone) (PES) to fabricate the graphene containing nanocomposite membranes (NCMs). Strong π–π interactions contributed to the uniform dispersion of GO-PEI nanosheets in bulk PES to form the asymmetric structure of NCM without leaching. The ratio of the GO-PEI additive regulated the surface charge and hydrophilicity of NCMs. To filter charged proteins, the designed NCM exhibited a high permeability (flux) and high selectivity (retention) while showing resistance to fouling by the charged proteins, which could be attributed to the asymmetric structure and composition of the NCM that the porous internal and surface composited with the GO-PEI additive was responsible for the NCM’s high flux; thereafter, the electrostatic attraction of the NCM surface to the charged pollutant enhanced the solute/water selectivity; finally, the synergistic effect of the hydrophilic and charged functional groups of the GO-PEI contributed to the formation of a dense hydration layer on the membrane surface thereby reducing membrane fouling. The NCM functionalized with the GO-PEI additive demonstrated potential for high-performance pollutant removal in water and wastewater treatments.
中文翻译：
纳米复合膜与聚乙烯亚胺接枝的氧化石墨烯作为提高污染物过滤性能的新型添加剂
合成膜经常遭受普遍的污染以及渗透性和选择性之间的折衷。然而，迫切需要能够减轻膜结垢并打破渗透性和选择性权衡的新兴材料。通过将聚乙烯亚胺（PEI）分子与氧化石墨烯（GO）纳米片共价接枝，制备了具有正电荷和亲水性的新型添加剂GO-PEI，随后将其与本体聚醚醚酮（PES）混合为制备含石墨烯的纳米复合膜（NCM）。强大的π-π相互作用有助于GO-PEI纳米片在散装PES中的均匀分散，从而形成NCM的不对称结构而不会浸出。GO-PEI添加剂的比例调节了NCM的表面电荷和亲水性。要过滤带电荷的蛋白质，设计的NCM表现出高渗透性（通量）和高选择性（保留），同时显示对带电蛋白质的抗结垢性，这可以归因于NCM的不对称结构和组成，即多孔内部和表面与GO-复合PEI添加剂是NCM高通量的原因。此后，NCM表面对带电污染物的静电吸引增强了溶质/水的选择性。最后，GO-PEI亲水和带电官能团的协同作用有助于在膜表面形成致密的水合层，从而减少了膜的结垢。用GO-PEI添加剂功能化的NCM展示了在水和废水处理中高效去除污染物的潜力。
更新日期：2018-04-27
中文翻译：
纳米复合膜与聚乙烯亚胺接枝的氧化石墨烯作为提高污染物过滤性能的新型添加剂
合成膜经常遭受普遍的污染以及渗透性和选择性之间的折衷。然而，迫切需要能够减轻膜结垢并打破渗透性和选择性权衡的新兴材料。通过将聚乙烯亚胺（PEI）分子与氧化石墨烯（GO）纳米片共价接枝，制备了具有正电荷和亲水性的新型添加剂GO-PEI，随后将其与本体聚醚醚酮（PES）混合为制备含石墨烯的纳米复合膜（NCM）。强大的π-π相互作用有助于GO-PEI纳米片在散装PES中的均匀分散，从而形成NCM的不对称结构而不会浸出。GO-PEI添加剂的比例调节了NCM的表面电荷和亲水性。要过滤带电荷的蛋白质，设计的NCM表现出高渗透性（通量）和高选择性（保留），同时显示对带电蛋白质的抗结垢性，这可以归因于NCM的不对称结构和组成，即多孔内部和表面与GO-复合PEI添加剂是NCM高通量的原因。此后，NCM表面对带电污染物的静电吸引增强了溶质/水的选择性。最后，GO-PEI亲水和带电官能团的协同作用有助于在膜表面形成致密的水合层，从而减少了膜的结垢。用GO-PEI添加剂功能化的NCM展示了在水和废水处理中高效去除污染物的潜力。
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