Reticulated Polyamide Thin-Film Nanocomposite Membranes Incorporated with 2D Boron Nitride Nanosheets for High-Performance Nanofiltration,ACS Applied Materials & Interfaces

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Reticulated Polyamide Thin-Film Nanocomposite Membranes Incorporated with 2D Boron Nitride Nanosheets for High-Performance Nanofiltration
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-06-01 , DOI: 10.1021/acsami.3c04724
Xi Zheng ₁ , Tao Wang _{1,

2} , Shen-Hui Li ₁ , Ying-Nan Feng ₁ , Zhen-Zhen Zhao ₁ , Yong-Sheng Ren ₃ , Zhi-Ping Zhao ₁

Affiliation

Nanofiltration (NF) technology has been widely used in saline wastewater treatment due to its unique separation mechanism. However, the NF membrane, as the core of the nanofiltration technology, is restricted by the trade-off between permeability and selectivity, which greatly restricts the development of NF membranes. The interlamellar arrangement of 2D boron nitride nanosheets (BNNSs) can provide additional transport channels and selectivity, as well as strong adsorption capacity due to its high specific surface area, exhibiting significant potential for advanced membranes. In this work, BNNSs prepared by tannic acid (TA)-assisted exfoliation (TA@BNNSs) were successfully adopted to fabricate thin-film nanocomposite (TFN) membranes via interfacial polymerization (IP). The resultant TFN membranes’ structure and properties were systematically characterized via various methods. The results demonstrated that the surface morphology of polyamide membranes evolved gradually from a nodular structure to a reticular topography, accompanied by the decrease of the thickness of the polyamide selective layer when incorporating TA@BNNSs into the membranes. This phenomenon can be mainly ascribed to that the uptake density and diffusion of piperazine (PIP) monomer were effectively regulated by BNNSs. This is validated by molecular dynamics and revealed by the adsorption of PIP in BN models, the diffusion coefficients, and interaction energies, respectively. In addition, the TFN membranes demonstrated improved permeance and stable solute rejection for the inorganic salts. Specifically, the water flux of PA-TA@BNNSs-10%/PMIA membrane could reach up to 109.1 ± 2.49 L·m^–2·h^–1 while keeping a high rejection of 97.5 ± 0.38% to Na₂SO₄, which was superior to most of the reported membranes in the literature. Besides, the PA-TA@BNNSs-10%/PMIA membrane exhibited an excellent stability in the long-term filtration process. The finding in this work provides a potential strategy for developing the next-generation 2D material-based membranes with high-performance for separation applications.

中文翻译：

网状聚酰胺薄膜纳米复合膜结合二维氮化硼纳米片用于高性能纳滤

纳滤(NF)技术以其独特的分离机理在含盐废水处理中得到广泛应用。然而，纳滤膜作为纳滤技术的核心，其渗透性和选择性之间的权衡问题极大地制约了纳滤膜的发展。二维氮化硼纳米片 (BNNS) 的层间排列可以提供额外的传输通道和选择性，以及由于其高比表面积而具有强大的吸附能力，显示出先进膜的巨大潜力。在这项工作中，通过单宁酸 (TA) 辅助剥离 (TA@BNNSs) 制备的 BNNSs 被成功地用于通过界面聚合 (IP) 制造薄膜纳米复合材料 (TFN) 膜。通过各种方法系统地表征了所得 TFN 膜的结构和特性。结果表明，当将 TA@BNNSs 掺入膜中时，聚酰胺膜的表面形态逐渐从结节状结构演变为网状形貌，同时伴随着聚酰胺选择性层厚度的减少。这种现象主要归因于哌嗪 (PIP) 单体的摄取密度和扩散受到 BNNS 的有效调节。这已通过分子动力学验证，并分别通过 BN 模型中 PIP 的吸附、扩散系数和相互作用能来揭示。此外，TFN 膜表现出改善的渗透性和对无机盐的稳定溶质排斥。具体来说，^–2 ·h ^{–1同时保持对 Na}₂ SO ₄的 97.5 ± 0.38% 的高截留率，优于文献中报道的大多数膜。此外，PA-TA@BNNSs-10%/PMIA膜在长期过滤过程中表现出优异的稳定性。这项工作中的发现为开发具有高性能分离应用的下一代基于二维材料的膜提供了潜在的策略。

更新日期：2023-06-01

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