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首页> 外文期刊>Water Research >Light sheet fluorescence microscopy applied for in situ membrane fouling characterization: The microscopic events of hydrophilic membrane in resisting DEX fouling
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Light sheet fluorescence microscopy applied for in situ membrane fouling characterization: The microscopic events of hydrophilic membrane in resisting DEX fouling

机译：用于原位膜结束表征的光片荧光显微镜：亲水性膜的微观事件抵抗抗污垢

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摘要

Membrane fouling restricts the wide applications of membrane technology and therefore, it is essential to develop novel analytical techniques to characterize membrane fouling and to further understand the mechanism behind it. In this work, we demonstrate a capability of high-resolution large-scale 3D visualization and quantification of the foulants on/in membranes during fouling process based on light sheet fluorescence microscopy as a noninvasive reproducible optical approach. The adsorption processes of dextran (DEX) on/in two polyvinylidene fluoride membranes with similar pore structure but distinct surface hydrophilicity were clearly observed. For a hydrophilic polyvinylidene fluoride (PVDF) membrane, the diffusion and adsorption of the DEX in membrane matrix were much slower compared to that for a hydrophobic membrane. A concentrated foulant layer was observed in the superficial potion of the hydrophilic membrane matrix while the foulants were observed quickly penetrating across the overall hydrophobic PVDF membrane during a short adsorption process. Both the inner concentrated fouling layer (in membrane superficial portion) and the foulant penetration (in membrane asymmetric structure) presented correlations with membrane fouling irreversibility, which could elucidate the microscopic events of hydrophilic membrane in resisting fouling. In addition, the imaging results could be correlated with the XDLVO analysis, suggesting how the membrane-foulant and foulant-foulant interfacial interactions resulted in a time-dependent membrane fouling process. This work provides a fast, highly-sensitive and noninvasive imaging platform for in situ characterization of membrane fouling evolution and should be useful for a wide range of membrane-based process explorations. (C) 2020 Published by Elsevier Ltd.
机译：膜污染限制了膜技术的广泛应用，因此，必须开发新的分析技术，以表征膜污垢并进一步了解其背后的机制。在这项工作中，我们证明了在基于光片荧光显微镜的污垢过程中的高分辨率大规模3D可视化和定量膜上的污垢，作为非侵入性可再现的光学方法。清楚地观察到具有相似孔隙结构但不同表面亲水性的两种聚偏二氟乙烯膜上的葡聚糖（DEX）的吸附过程。对于亲水性聚偏二氟乙烯（PVDF）膜，与疏水性膜相比，膜基质中的DEX的扩散和吸附得多得多。在亲水性膜基质的浅表水溶液中观察到浓缩污垢层，同时观察到污垢在短的吸附过程中迅速穿过整个疏水PVDF膜上的污垢渗透。内集中的污垢层（膜浅表部分）和污垢渗透（膜不对称结构）呈现与膜污垢不可逆性的相关性，这可以阐明亲水性膜的微观事件抵抗污垢。此外，成像结果可以与XDLVO分析相关，表明膜 - 污垢和污垢 - 污染的界面相互作用是如何依赖于时间依赖的膜污垢过程。这项工作为膜污染演化的原位表征提供了一种快速，高度敏感和非侵入性的成像平台，可用于广泛的基于膜的过程探索。 （c）2020由elestvier有限公司发布

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  • 来源
    《Water Research》 |2020年第15期|116240.1-116240.13|共13页
  • 作者

    Chen Lingling; Zhang Yang; Li Renjian; Zhang Haoquan; Zhang Meng; Zhang Hongwei;

  • 作者单位

    Shenzhen Technol Univ Coll Hlth Sci & Environm Engn Shenzhen 518118 Guangdong Peoples R China;

    Tiangong Univ Sch Environm Sci & Engn State Key Lab Separat Membranes & Membrane Proc Tianjin 300387 Peoples R China;

    Shenzhen Technol Univ Coll Hlth Sci & Environm Engn Shenzhen 518118 Guangdong Peoples R China;

    Tiangong Univ Sch Environm Sci & Engn State Key Lab Separat Membranes & Membrane Proc Tianjin 300387 Peoples R China;

    Beihang Univ Sch Elect & Informat Engn Beijing 100191 Peoples R China;

    Tiangong Univ Sch Environm Sci & Engn State Key Lab Separat Membranes & Membrane Proc Tianjin 300387 Peoples R China|Tianjin Univ Sch Environm Sci & Engn Tianjin 300072 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Membrane fouling mechanism; Foulant depth distribution; In situ characterization; Light sheet fluorescence microscopy;

    机译：膜污垢机制;污垢深度分布;原位表征;光片荧光显微镜;

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