Retention Site Contribution Toward Silver Particle Immobilization in Porous Media
Retention Site Contribution Toward Silver Particle Immobilization in Porous Media
复制标题
保留位点对多孔介质中银颗粒固定的贡献
DOI：
10.1029/2021wr031807
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发表时间：
2022
影响因子：
5.4
通讯作者：
Morales, Verónica L.
中科院分区：
文献类型：
--
作者：
Patiño, Janis E.;Pérez‐Reche, Francisco J.;Morales, Verónica L.
本文采用基于图像分析的新方法研究了孔结构在胶体截留中的作用。实验的目的是量化与强大的药理学的贡献，从共同提出的保留位点对胶体固定。特定的保留位点包括固体-水界面、空气-水界面、空气-水-固体三相点、颗粒-颗粒接触和薄膜。在含有银微球的模型玻璃珠多孔介质中测试孔隙水含量、流速和化学性质的可变条件。来自流出物穿透的浓度信号和来自微X射线计算机断层扫描的保留颗粒的空间分布用于计算质量平衡并在三维中计数感兴趣的孔尺度区域。在达西尺度下，保留的胶体遵循非单调沉积曲线，这意味着流动停滞区的影响。通过保留位点分析了固定化胶体沿着多孔介质深度的空间分布，揭示了胶体的深度无关分配。在孔隙尺度上，考虑的所有保留位点的优势和总体饱和度表明，与流动停滞相关的固体-水界面和楔形区域（饱和条件下的颗粒与颗粒接触以及不饱和条件下的空气-水-固体三相点）是测试条件下保留的最大贡献者。在界面尺度上，xDLVO能量分布与孔尺度观察结果一致。我们的计算表明，胶体和固体-水界面以及弱絮凝（例如，在流动停滞区），但胶体和空气-水界面之间的不利相互作用。总的来说，我们证明了孔结构在胶体固定中起着关键作用，并且当考虑孔结构时，达西尺度、孔尺度和界面尺度是一致的。
This work investigates the role that pore structure plays in colloid retention across scales with a novel methodology based on image analysis. Experiments were designed to quantify–with robust statistics–the contribution from commonly proposed retention sites toward colloid immobilization. Specific retention sites include solid‐water interface, air‐water interface, air‐water‐solid triple point, grain‐to‐grain contacts, and thin films. Variable conditions for pore‐water content, velocity, and chemistry were tested in a model glass bead porous medium with silver microspheres. Concentration signals from effluent breakthrough and spatial profiles of retained particles from micro X‐ray Computed Tomography were used to compute mass balances and enumerate pore‐scale regions of interest in three dimensions. At the Darcy‐scale, retained colloids follow non‐monotonic deposition profiles, which implicates effects from flow‐stagnation zones. The spatial distribution of immobilized colloids along the porous medium depth was analyzed by retention site, revealing depth‐independent partitioning of colloids. At the pore‐scale, dominance and overall saturation of all retention sites considered indicated that the solid‐water interface and wedge‐shaped regions associated with flow‐stagnation (grain‐to‐grain contacts in saturated and air‐water‐solid triple points in unsaturated conditions) are the greatest contributors toward retention under the tested conditions. At the interface‐scale, xDLVO energy profiles were in agreement with pore‐scale observations. Our calculations suggest favorable interactions for colloids and solid‐water interfaces and for weak flocculation (e.g., at flow‐stagnation zones), but unfavorable interactions between colloids and air‐water interfaces. Overall, we demonstrate that pore‐structure plays a critical role in colloid immobilization and that Darcy‐, pore‐ and interface‐scales are consistent when the pore structure is taken into account.
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影响因子：
5.4
作者：
Dantong Lin;Liming Hu;S. Bradford;Xinghao Zhang;Irene M. C. Lo
通讯作者：
Dantong Lin;Liming Hu;S. Bradford;Xinghao Zhang;Irene M. C. Lo
影响因子：
2.8
作者：
Crist, JT;McCarthy, JF;Steenhuis, TS
通讯作者：
Steenhuis, TS
影响因子：
3.2
作者：
Gadre, KS;Alford, TL
通讯作者：
Alford, TL
影响因子：
4.3
作者：
Park, Eun-Jung;Bae, Eunjoo;Park, Kwangsik
通讯作者：
Park, Kwangsik
DOI：
10.1021/la3016589
发表时间：
2012-07
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Shihong Lin;M. Wiesner
通讯作者：
Shihong Lin;M. Wiesner