Zwitterionic and hydrophilic polyelectrolyte/metal ion anti-fouling layers via covalent and coordination bonds for reverse osmosis membranes,Materials Chemistry Frontiers

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Zwitterionic and hydrophilic polyelectrolyte/metal ion anti-fouling layers via covalent and coordination bonds for reverse osmosis membranes
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2021-3-24 , DOI: 10.1039/d1qm00122a
Mengying Jiang _{1,

2,

3,

4} , Li-Ye Chen _{1,

2,

3,

4} , Qian Zou _{1,

2,

3,

4} , Siwei Xiong _{1,

2,

3,

4} , Peigen Fu _{1,

2,

3,

4} , Jing-Gang Gai _{1,

2,

3,

4}

Affiliation

Reverse osmosis (RO) membrane technology, as an effective and eco-friendly method, has been widely used for seawater desalination and sewage treatment. However, RO membranes inevitably suffer serious organic and biological fouling during operation. Herein, we fabricated a hydrophilic anti-fouling layer on the RO membrane surface through the synergistic effect of covalent bonds and coordination bonds. Polyethyleneimine (PEI) and polyaspartic acid (PASP) are assembled onto the RO membrane surface successively. Fe(III) is utilized to induce further cross-linking for fabricating the PEI/PASP/Fe layer. The modified membranes exhibit superior hydrophilicity, whose water contact angle declines from 86.7° to 23.6°. In addition, the water flux of the PEI/PASP/Fe membrane increases by 45.8% with an excellent desalting property. Long-term, multi-cycle membrane fouling experiments demonstrate that the modified membrane manifests not only a lower flux loss rate (DR_t) but also a higher flux recovery rate (FRR). This means that the hydrophilic layer modified membranes show excellent separation performance even under severe environments, which is expected to boost the anti-fouling research in the membrane field.

中文翻译：

通过共价键和配位键的两性离子和亲水性聚电解质/金属离子防污层，用于反渗透膜

反渗透（RO）膜技术是一种有效且环保的方法，已被广泛用于海水淡化和污水处理。然而，反渗透膜在操作过程中不可避免地遭受严重的有机和生物污染。本文中，我们通过共价键和配位键的协同作用，在反渗透膜表面制备了亲水防污层。将聚乙烯亚胺（PEI）和聚天冬氨酸（PASP）依次组装到反渗透膜表面。铁（III））被用来诱导进一步的交联以制造PEI / PASP / Fe层。改性膜表现出优异的亲水性，其水接触角从86.7°降至23.6°。另外，PEI / PASP / Fe膜的水通量增加了45.8％，具有出色的脱盐性能。长期的多周期膜污染实验表明，改性膜不仅显示出较低的通量损失率（DR _t），而且还显示出较高的通量回收率（FRR）。这意味着即使在恶劣的环境下，亲水层改性的膜也显示出优异的分离性能，这有望促进膜领域的防污研究。

更新日期：2021-04-12

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