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首页> 外文期刊>Environmental Science & Technology >Retention and Release of Graphene Oxide in Structured Heterogeneous Porous Media under Saturated and Unsaturated Conditions
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Retention and Release of Graphene Oxide in Structured Heterogeneous Porous Media under Saturated and Unsaturated Conditions

机译：饱和和不饱和条件下结构异质多孔介质中氧化石墨烯的保留和释放

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摘要

In this work, saturated and unsaturated structured heterogeneous sand columns were used to examine the fate of graphene oxide (GO) nanoparticles in heterogeneous porous media under various conditions. A two-domain model considering mass exchange between zones was applied to describe GO retention and transport in structured, heterogeneous porous media, which matched the transport experimental breakthroughs well. Experimental and model results showed that GO retention and transport in all the heterogeneous columns were dominated by the preferential flow phenomena. Under saturated conditions, the coarse sand with higher hydraulic conductivity was the fast-flow domain (FFD), and the fine sand was the slow-flow domain (SFD), and both FFD and SFD affected GO particles fate in structured heterogeneous media. When the heterogeneous columns were drained, the fine sand with higher moisture content became the FFD, and the coarse sand was the SFD, however, preferential flows in the FFD dominated GO retention and transport processes. For all the columns, the mobility of GO decreased with the increasing ionic strength (IS), and the previous retained particles were released by reducing solution IS, indicating part of the retained particles were trapped in the secondary minimum energy well.
机译：在这项工作中，饱和和不饱和结构的异质砂柱被用来检查在各种条件下异质多孔介质中氧化石墨烯（GO）纳米颗粒的命运。应用考虑区域之间质量交换的两域模型来描述GO在结构化，非均质多孔介质中的保留和运输，这与运输实验的突破非常吻合。实验和模型结果表明，GO在所有非均质色谱柱中的保留和转运均受优先流动现象的支配。在饱和条件下，具有较高水力传导率的粗砂为快流域（FFD），细砂为慢流域（SFD），并且FFD和SFD都会影响结构异质介质中的GO颗粒命运。排出异质柱后，水分含量较高的细砂成为FFD，而粗砂为SFD，但是，FFD中的优先流动主导了GO的保留和运输过程。对于所有的色谱柱，GO的迁移率均随离子强度（IS）的增加而降低，并且先前的保留颗粒通过还原溶液IS释放，表明部分保留颗粒被捕获在次级最小能量阱中。

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  • 来源
    《Environmental Science & Technology》 |2016年第19期|10397-10405|共9页
  • 作者

    Shunan Dong; Xiaoqing Shi; Bin Gao; Jianfeng Wu; Yuanyuan Sun; Hongyan Guo; Hongxia Xu; Jichun Wu;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

    Department of Agricultural and Biological Engineering, University of Florida, Gainesville, Florida 32611, United States;

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Surficial Geochemisty, Ministry of Education, School of Earth Sciences and Engineering, Hydrosciences Department, Nanjing University, Nanjing 210023, China;

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