Enhanced permeability and biofouling mitigation of forward osmosis membranes via grafting graphene quantum dots

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL Frontiers of Chemical Science and Engineering Pub Date : 2023-06-19 DOI:10.1007/s11705-023-2329-5

Nan Li, Yumeng Zhang, Peng Li, Bo Zhu, Wei Wang, Zhiwei Xu

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Abstract

In this paper, graphene oxide quantum dots with amino groups (NH₂-GOQDs) were tailored to the surface of a thin-film composite (TFC) membrane surface for optimizing forward osmosis (FO) membrane performance using the amide coupling reaction. The results jointly demonstrated hydrophilicity and surface roughness of the membrane enhanced after grafting NH₂-GOQDs, leading to the optimized affinity and the contact area between the membrane and water molecules. Therefore, grafting of the membrane with a concentration of 100 ppm (TFC-100) exhibited excellent permeability performance (58.32 L·m⁻²·h⁻¹) compared with TFC membrane (16.94 L·m⁻²·h⁻¹). In the evaluation of static antibacterial properties of membranes, TFC-100 membrane destroyed the cell morphology of Escherichia coli (E. coli) and reduced the degree of bacterial adsorption. In the dynamic biofouling experiment, TFC-100 membrane showed a lower flux decline than TFC membrane. After the physical cleaning, the flux of TFC-100 membrane could recover to 96% of the initial flux, which was notably better than that of TFC membrane (63%). Additionally, the extended Derjaguin–Landau–Verwey–Overbeek analysis of the affinity between pollutants and membrane surface verified that NH₂-GOQDs alleviates E. coli contamination of membrane. This work highlights the potential applications of NH₂-GOQDs for optimizing permeability and biofouling mitigation of FO membranes.

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通过接枝石墨烯量子点增强正渗透膜的渗透性和减轻生物污垢

在本文中，将具有氨基的氧化石墨烯量子点（NH2-GOQDs）定制到薄膜复合材料（TFC）膜表面，以使用酰胺偶联反应优化正渗透（FO）膜的性能。结果共同表明，接枝NH2-GOQDs后，膜的亲水性和表面粗糙度增强，从而优化了膜与水分子之间的亲和力和接触面积。因此，与TFC膜（16.94 L·m−2·h−1）相比，浓度为100ppm的膜（TFC-100）的接枝表现出优异的渗透性能（58.32 L·m–2·h–1）。在膜的静态抗菌性能评价中，TFC-100膜破坏了大肠杆菌（E.coli）的细胞形态，降低了细菌的吸附程度。在动态生物污垢实验中，TFC-100膜表现出比TFC膜更低的通量下降。物理清洗后，TFC-100膜的通量可恢复到初始通量的96%，明显优于TFC膜（63%）。此外，对污染物与膜表面之间的亲和力进行了扩展的Derjaguin–Landau–Verwey–Overbeek分析，验证了NH2 GOQDs减轻了膜的大肠杆菌污染。这项工作强调了NH2 GOQDs在优化FO膜的渗透性和生物污垢缓解方面的潜在应用。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.