The complex influence of membrane roughness on colloidal fouling: A dialectical perspective

文献类型： 外文期刊

第一作者： Zhao, Dongsheng

作者： Zhao, Dongsheng;Chen, Linchun;Peng, Mingxin;Xue, Bingchao;Wang, Zhihong;Liu, Junxia;Yao, Zhikan;Huang, Weiwei

作者机构：

关键词： Membrane roughness; Contact angle; Energy barrier; Collision attachment; Wettability theory

期刊名称：JOURNAL OF MEMBRANE SCIENCE （ 影响因子：9.0； 五年影响因子：8.8 ）

ISSN： 0376-7388

年卷期： 2025 年 725 卷

页码：

收录情况： SCI

摘要： Roughness is a key feature of membrane surface topography, yet its impact on fouling remains unclear. Herein, we present a coupled collision attachment-wettability framework to investigate the impact of membrane roughness on fouling from a dialectical perspective. Our findings show that for hydrophilic membranes, increasing surface roughness enhances the interfacial hydration repulsion barrier, reducing fouling. In contrast, for hydrophobic membranes, rougher surfaces lower the interfacial energy barrier, increasing fouling. The effect of roughness is also influenced by the membrane's intrinsic contact angle (theta 0), initial water flux (J0), and solution ionic strength (Is). Membranes with lower theta 0 maintain higher stable flux, even when smooth, while fouling resistance for higher theta 0 membranes depends more on surface roughness. At lower J0 or Is, flux remains relatively stable with slight/mild reductions, due to reduced permeate drag or enhanced electrostatic repulsion. In contrast, severe fouling occurs under high J0 or Is, irrespective of surface roughness. Our simulations reveal the various mechanisms (i.e., hydration repulsion, permeate drag, and electrostatic interactions) that govern the role of surface roughness in fouling, providing valuable implications for membrane design, operational optimization, and feedwater pretreatment.

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