Improved Performance and Mitigated Internal Concentration Polarization of Thin-Film Composite Forward Osmosis Membrane with Polysulfone/Polyaniline Substrate,ACS Applied Polymer Materials

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Improved Performance and Mitigated Internal Concentration Polarization of Thin-Film Composite Forward Osmosis Membrane with Polysulfone/Polyaniline Substrate
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-10-29 , DOI: 10.1021/acsapm.1c00964
Xing Wu ₁ , Thomas M. Kohl ₁ , John Tsanaktsidis ₁ , Zongli Xie ₁

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Thin-film composite (TFC) membranes have been widely used in forward osmosis for desalination and water treatment. Nonetheless, the dilemma between selectivity and permeability and serious internal concentration polarization (ICP) still limits the filtration efficiency of TFC-FO membranes. Herein, a high-efficiency TFC-FO membrane was synthesized by embedding a polysulfone (PSf)/polyaniline (PANI) coblend membrane as the substrate. Impacts of PANI on both the substrate and the TFC-FO membrane were investigated by optimizing the concentration of PANI in substrates. The results indicated that the addition of PANI can adjust the properties of substrates, producing substrates with better hydrophilicity and improved porosity. This further mitigated the interfacial polymerization process and reduced the polyamide layer thickness. Compared to the pristine PSf-based TFC-FO membrane and the commercial FO membrane, the PSf/PANI-based TFC-FO membrane with 0.6 wt% PANI loading exhibited significantly enhanced water flux (209%) and decreased specific salt flux (40%). Moreover, the addition of PANI into substrates effectively mitigated the ICP phenomenon of the PSf/PANI-based TFC-FO membrane, with a 290% lower structure parameter (S) than that of the pristine TFC-FO membrane. This work offers an effective strategy to enhance the filtration capabilities of TFC-FO membranes by tuning substrate properties.

中文翻译：

具有聚砜/聚苯胺基材的薄膜复合正向渗透膜的性能改进和内部浓度极化减轻

薄膜复合 (TFC) 膜已广泛用于正渗透，用于海水淡化和水处理。尽管如此，选择性和渗透性之间的困境以及严重的内部浓差极化（ICP）仍然限制了TFC-FO膜的过滤效率。在此，通过嵌入聚砜 (PSf)/聚苯胺 (PANI) 共混膜作为基材合成了高效 TFC-FO 膜。通过优化底物中 PANI 的浓度，研究了 PANI 对底物和 TFC-FO 膜的影响。结果表明，PANI的加入可以调节基材的性能，使基材具有更好的亲水性和孔隙率。这进一步减轻了界面聚合过程并降低了聚酰胺层厚度。与原始的基于 PSf 的 TFC-FO 膜和商业 FO 膜相比，具有 0.6 wt% PANI 负载的基于 PSf/PANI 的 TFC-FO 膜表现出显着增强的水通量（209%）和降低的比盐通量（40%））。此外，将 PANI 添加到基材中有效地减轻了基于 PSf/PANI 的 TFC-FO 膜的 ICP 现象，结构参数降低了 290%（S ) 比原始的 TFC-FO 膜。这项工作提供了一种有效的策略，通过调整底物特性来增强 TFC-FO 膜的过滤能力。

更新日期：2021-11-12

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