On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions
On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions
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瞬态化学条件下层状非均质多孔介质中纳米粒子的传输和释放
DOI：
10.1016/j.jhydrol.2020.124889
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发表时间：
2020-07
影响因子：
6.4
通讯作者：
Zheng CM
中科院分区：
文献类型：
--
作者：
Liu J;Zeng XK;Ma E;Wu JC;Zhang YK;Sun YY;Liang XY;Zheng CM
纳米颗粒（NPs）在广泛的商业和工业过程中的生产和应用的快速增加导致NPs广泛侵入地下环境。准确预测纳米颗粒在地下环境中的迁移和释放对于评估广泛的环境和人类健康风险非常重要。在这项研究中，提出了一个二维的NP传输和释放模型来研究的行为与瞬态离子强度（IS）的层状非均匀介质中的NP。层状非均质多孔介质由慢流区（SFD）和快流区（FFD）组成。NP在两层中的输运由两个耦合的对流-弥散方程（ADEs）描述。NP的沉积和释放与介质中电解质溶液（ES）的IS有关，并由ADE中的可逆和不可逆沉积项表示。结果表明，异质性对NP的运输和释放有显着的影响。当NP通过双层介质时，最初FFD中的部分NP将迁移到SFD中。由于SFD的较高过滤能力，SFD中沉积的NP的量比FFD中的大。当IS下降时，SFD和FFD中保留的NP将被释放。FFD中保留的NP的释放比SFD中更快，因为FFD具有更高的固有释放速率和更低的IS，这是由于ES在FFD中更快的转运。将该模型应用于室内实验，并与双区模型进行了比较。与双区模型相比，该模型能更好地拟合实验穿透曲线，并能拟合双区模型不能拟合的NPs释放量。
The rapid increase in production and application of nanoparticles (NPs) across a wide range of commercial and industrial processes has resulted in the extensive invasion of NPs into subsurface environments. Accurately predicting the transport and release of NPs in subsurface environments is important for assessing a wide range of environmental and human health risks. In this study, a two-dimensional NP transport and release model was proposed to investigate the behavior of NPs in a layered heterogeneous medium with transient ionic strength (IS). The layered heterogeneous porous medium comprised a slow flow domain (SFD) and a fast flow domain (FFD). The transport of NPs in the two layers was described by two coupled advection–dispersion equations (ADEs). The NP deposition and release were related to the IS of the electrolyte solution (ES) in the medium and were represented by reversible and irreversible deposition terms in the ADEs. The results indicated that heterogeneity has a significant impact on the transport and release of NPs. When NPs pass through the two‐layer medium, initially part of the NPs in the FFD will migrate into the SFD. A larger amount of NPs are deposited in the SFD than the FFD owing to the higher filtration capacity of the SFD. The retained NPs in both the SFD and FFD will be released when the IS declines. The release of the retained NPs in the FFD is faster than that in the SFD because the FFD has a higher intrinsic release rate and lower IS owing to the more rapid transport of ES in the FFD. The proposed model was applied to laboratory experiments and compared to the double-region model. The proposed model fitted the experimental breakthrough curves better than the double-region model, and it is capable of fitting the release of NPs, which cannot be accomplished with the double-region model.
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DOI：
10.1021/acs.langmuir.5b03080
发表时间：
2015-10
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
S. Bradford;S. Torkzaban
通讯作者：
S. Bradford;S. Torkzaban
影响因子：
2.7
作者：
Z. Mesticou;M. Kacem;P. Dubujet
通讯作者：
Z. Mesticou;M. Kacem;P. Dubujet
影响因子：
12.8
作者：
Yuanyuan Sun;B. Gao;S. Bradford;Lei Wu;Hao Chen;Xiaoqing Shi;Jichun Wu
通讯作者：
Yuanyuan Sun;B. Gao;S. Bradford;Lei Wu;Hao Chen;Xiaoqing Shi;Jichun Wu
影响因子：
11.4
作者：
E. Pazmiño;J. Trauscht;W. Johnson
通讯作者：
E. Pazmiño;J. Trauscht;W. Johnson
DOI：
10.1021/la4011357
发表时间：
2013-05
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
S. Bradford;S. Torkzaban;A. Shapiro
通讯作者：
S. Bradford;S. Torkzaban;A. Shapiro