He Mingrui, He Yulun, Lu Dongwei, Wang Mengfei, Yang Junjie, Wu Tong, Ma Jun
State Key Laboratory of Urban-Rural Water Resource & Environment, School of Environment, Harbin Institute of Technology, Harbin, People's Republic of China.
Nat Commun. 2025 Jul 30;16(1):6956. doi: 10.1038/s41467-025-62231-w.
This study develops water treatment membranes using an innovative surface modifier comprising threaded supramolecular assemblies formed by hydrophilic cyclodextrin (CD) and low-surface-energy polydimethylsiloxane (PDMS). These supramolecular constructs establish dynamic hydrophilic and low-surface-energy heterogeneous microdomains that enhance synergistic resistance-release antifouling mechanisms. The modified membranes demonstrate better antifouling performance compared to conventional systems, particularly addressing the critical limitation of traditional membranes under low tangential flow conditions. The Brownian motion of the CDs sustains microdomain activity to prevent foulant accumulation in static environments, while tangential flow amplifies dynamic interactions to accelerate foulant detachment. The threading configuration of CDs along PDMS chains prevents water channel blockage caused by PDMS aggregation and facilitates water transport through the dynamic mobility of CDs. When separating bovine serum albumin solutions under an initial flux of 550 L·m·h with 60 rpm stirring, the membrane exhibits merely 14.2% flux decline, highlighting its exceptional antifouling performance and permeability.
本研究使用一种创新的表面改性剂开发水处理膜，该改性剂由亲水性环糊精（CD）和低表面能聚二甲基硅氧烷（PDMS）形成的螺纹超分子组装体组成。这些超分子结构建立了动态亲水性和低表面能的异质微区，增强了协同抗污释放机制。与传统系统相比，改性膜表现出更好的抗污性能，尤其解决了传统膜在低切向流条件下的关键局限性。CD的布朗运动维持微区活性，防止污染物在静态环境中积累，而切向流则放大动态相互作用以加速污染物的脱离。CD沿PDMS链的螺纹构型可防止因PDMS聚集导致的水通道堵塞，并通过CD的动态迁移促进水的传输。在60转/分钟搅拌下，当初始通量为550 L·m·h分离牛血清白蛋白溶液时，该膜仅表现出14.2%的通量下降，突出了其卓越的抗污性能和渗透性。
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