通过简单的PEI改性增强氧化石墨烯膜中全氟辛酸的选择性渗透分离,Journal of Materials Chemistry A

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通过简单的PEI改性增强氧化石墨烯膜中全氟辛酸的选择性渗透分离
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0ta06523d
Sally El Meragawi _{1,

2,

3,

4,

5} , Abozar Akbari _{2,

3,

4,

5,

6} , Sebastian Hernandez _{2,

3,

4,

5,

6} , Meysam Sharifzadeh Mirshekarloo _{2,

3,

4,

5,

6} , Dibakar Bhattacharyya _{7,

8,

9,

10} , Akshat Tanksale _{1,

2,

3,

4} , Mainak Majumder _{1,

2,

3,

4,

5}

Affiliation

各种分子量的全氟烷基化合物已成为一类持久性污染物，对人类健康和环境产生了深远的负面影响。评估了氧化石墨烯（GO）和胺表面官能化的GO纳滤膜的选择性和通透性，以去除与废水中可利用性有关的浓度范围内的全氟辛酸（PFOA〜400 Da）。GO纳滤膜在50 ppm PFOA和10±2.1 L m ^-2 h ^-1 bar ^-1的水透过率下显示出74.3％的合理效率。通过用聚乙烯亚胺（PEI）功能化顶表面，GO膜经历了还原和交联反应。改性膜表现出改善的机械稳定性，在50 ppm PFOA时保留率提高了96.5％，渗透率为15.9±1.3 L m ^-2 h ^-1 bar ^-1。富电子的PEI使GO脱氧，从而减小了中间层的间距，但也增加了表面亲水性-这两种特性的结合导致空间位阻增加了PFOA的保留并增强了水的渗透性。由于空间位阻效应是保留的主要机制，因此与GO膜相比，GO-PEI膜在更宽的浓度范围（100 ppb至100 ppm）中更有效地工作（保留> 90％）。我们的研究表明，战略性的表面改性技术可以使基于GO的疏松纳滤膜的功效得以保持，以保留新兴污染物，同时通过最小化盐分保持较低的渗透压效应。

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Enhanced permselective separation of per-fluorooctanoic acid in graphene oxide membranes by a simple PEI modification

Perfluoroalkyl compounds of various molecular weights have emerged as a class of persistent contaminants with profound negative impact on human health and the environment. The selectivity and permeance of Graphene Oxide (GO) and amine surface functionalised GO nanofiltration membranes were assessed for the removal of perfluorooctanoic acid (PFOA ∼400 Da) in concentration ranges relevant to availability in wastewater. GO nanofiltration membranes demonstrated a reasonable efficiency of 74.3% at 50 ppm of PFOA and a water permeance of 10 ± 2.1 L m⁻² h⁻¹ bar⁻¹. By functionalising the top surface with polyethyleneimine (PEI), the GO membrane underwent reduction and cross-linking reactions. The modified membranes demonstrated improved mechanical stability and an enhanced retention of 96.5% at 50 ppm PFOA and a permeance of 15.9 ± 1.3 L m⁻² h⁻¹ bar⁻¹. The electron rich PEI deoxygenates GO leading to a smaller interlayer spacing, but also increases the surface hydrophilicity—the combination of both these properties leads to increased PFOA retention by steric hindrance and enhanced water permeation. As steric hindrance effects were the dominant mechanism of retention, the GO-PEI membranes operated more effectively (retention >90%) in a much wider range of concentrations (100 ppb to 100 ppm), compared to the GO membrane. Our research demonstrates that strategic surface-modification techniques can tailor the effectiveness of GO-based loose nanofiltration membranes for the retention of emerging contaminants while maintaining lower osmotic pressure effects through salt retention minimisation.

更新日期：2020-11-17

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