Muhammad Adnan Akram , Zhongyang Wang , Mengting Wang , Shengchao Zhao , Q. Jason Niu
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引用次数: 0
Abstract
The escalating global demand for clean water has driven a growing interest in developing thin-film composite (TFC) membranes with high permeability and selectivity for wastewater treatment and desalination processes. Engineering polymer materials with precisely tunable properties for selective molecular separation remains a challenging step toward achieving this goal. Herein, we have fabricated a highly permselective asymmetric polyamide nanofilm with a dual-layer structure in which the bottom layer is a porous hyperbranched aromatic polyamide (HBPA) interlayer, and the top layer is a dense polyamide layer with a nanostrip structure. The HBPA porous layer was covalently assembled in situ via oxidative coupling reaction with ammonium persulfate on a polysulfone (PSF) substrate. The hydrophilic porous HBPA interlayer forms nanosized cavities that may enhance the storage and confine amine monomer diffusion, leading to the construction of a striped pattern PA nanofilm. The resulting asymmetric PA membrane exhibits excellent water permeability of 18.39 ± 1 L m−2 h−1 bar−1 (3.98 times that of control membranes) and improved divalent salt (Na2SO4) rejection (≥98 %), surpassing most of the commercial and reported nanofiltration membranes. The HBPA-regulated interfacial polymerization provides a groundbreaking framework for developing high-performance membranes for precisely controlled nanofiltration.
全球对清洁水的需求不断攀升,促使人们越来越关注开发具有高渗透性和选择性的薄膜复合(TFC)膜,用于废水处理和海水淡化工艺。要想实现这一目标,开发具有精确可调特性的聚合物材料以实现选择性分子分离仍是极具挑战性的一步。在这里,我们制作了一种具有双层结构的高渗透选择性不对称聚酰胺纳米薄膜,其中底层是多孔超支化芳香族聚酰胺(HBPA)夹层,顶层是具有纳米条状结构的致密聚酰胺层。HBPA 多孔层是通过与过硫酸铵的氧化偶联反应在聚砜(PSF)基底上原位共价组装而成的。亲水性多孔 HBPA 中间层形成的纳米级空腔可提高存储能力并限制胺单体的扩散,从而构建出条纹图案的 PA 纳米膜。所制备的不对称 PA 膜具有出色的透水性(18.39 ± 1 L m h bar)(是对照膜的 3.98 倍)和更好的二价盐(NaSO)阻隔性(≥98%),超过了大多数商用和已报道的纳滤膜。HBPA 调节的界面聚合为开发用于精确控制纳滤膜的高性能膜提供了一个突破性框架。
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.