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Halloysite nanotubes for regulating thermodynamics and kinetics of polysulfone/poly (ethylene-co-vinyl alcohol) membranes with enhanced permeability
npj Clean Water ( IF 11.4 ) Pub Date : 2023-03-08 , DOI: 10.1038/s41545-023-00223-3
Sania Kadanyo , Christine N. Matindi , Nozipho N. Gumbi , Derrick S. Dlamini , Yunxia Hu , Zhenyu Cui , Benqiao He , Bhekie B. Mamba , Jianxin Li

Controlling membrane morphology is crucial to improving the mechanical strength (MS) and hydrophilicity of porous membranes. Here we report on the fabrication of mixed matrix membranes (MMMs) free of macrovoids via non-solvent-induced phase separation (NIPS). Hydrophilic Halloysite nanotubes (HNTs) and poly (ethylene-co-vinyl alcohol) (EVOH) were mixed with Hydrophobic polysulfone (PSF) in the presence of polyethylene glycol (PEG) to fabricate MMMs. The results showed the formation of PSF/EVOH-MMMs with a spongy structure when the content of HNTs varied from 0.06- 0.12 wt.%, owing to the formation of strong hydrogen bonds between PSF, EVOH, PEG, and HNTs, confirmed by molecular dynamics (MD) simulations. The MS of MMMs with 0.12 wt.% HNTs was increased 2.2-fold (up to 6.22 MPa), while the contact angle (CA) was lowest at 47.42 ± 1.9°. In addition, the water permeability increased by a factor of 1.7 up to 419 L m−2 h−1 bar−1. The rejection rates of MMMs (M12) for oil and BSA were >90% and >95%, respectively. While the MMMs had > 90% flux recovery for both oil and BSA. We predict that this study will provide a method for controlling dope thermodynamics, formation dynamics, and morphology of MMMs while maintaining promising properties for improved separation performance.



中文翻译:

用于调节具有增强渗透性的聚砜/聚(乙烯-共-乙烯醇)膜的热力学和动力学的埃洛石纳米管

控制膜形态对于提高多孔膜的机械强度 (MS) 和亲水性至关重要。在这里,我们报告了通过非溶剂诱导相分离 (NIPS) 制造无大孔隙的混合基质膜 (MMM)。在聚乙二醇 (PEG) 存在的情况下,将亲水性埃洛石纳米管 (HNT) 和聚(乙烯-共-乙烯醇)(EVOH) 与疏水性聚砜 (PSF) 混合以制造 MMM。结果表明,当 HNT 的含量在 0.06-0.12 wt.% 之间变化时,由于 PSF、EVOH、PEG 和 HNT 之间形成了强氢键,因此形成了具有海绵状结构的 PSF/EVOH-MMM,这通过分子生物学证实动力学 (MD) 模拟。含有 0.12 wt.% HNT 的 MMM 的 MS 增加了 2.2 倍(高达 6.22 MPa),而接触角 (CA) 最低,为 47.42 ± 1.9°。此外,-2小时-1-1。MMM (M12) 对油和 BSA 的拒绝率分别 > 90% 和 > 95%。而 MMM 对油和 BSA 的通量恢复 > 90%。我们预测,这项研究将提供一种方法来控制 MMM 的掺杂热力学、形成动力学和形态,同时保持有前途的特性以提高分离性能。

更新日期:2023-03-08
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