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     当前位置: 发布论文 --  院重点实验室博士生徐爽在《Science of The Total Environment》发表文章
院重点实验室博士生徐爽在《Science of The Total Environment》发表文章
发布时间:2016/11/22

院重点实验室博士生徐爽在《Science of The Total Environment》正式发表Coupled effect of extended DLVO and capillary interactions on the retention and transport of colloids through unsaturated porous media一文。本研究受院战略先导专项(XDB14020204)、 国家自然科学基金(31500437)等项目资助。

文章索引/Citation

Shuang Xu, Jun Qi, Xijuan Chen, Volha Lazouskaya, Jie Zhuang & Yan Jin. 2016. Coupled effect of extended DLVO and capillary interactions on the retention and transport of colloids through unsaturated porous media. Science of The Total Environment. 573:564-572. DOI:http://dx.doi.org/10.1016/j.scitotenv.2016.08.112. II. Impact Factor 4.317.

文章摘要/Abstract

Colloids are potential vectors of contaminants in the subsurface environment. The knowledge of transport and retention behaviors of colloids is of primary importance for assessment and prediction of subsurface pollution risks. In this study, sand column experiments were conducted to investigate the coupled effects of various interfacial forces on the retention and transport of a hydrophilic silica colloid and a relatively hydrophobic latex colloid. Water column experiments were performed to observe the movement of colloids with air bubbles. Extended DLVO interaction energies and capillary potential energy were calculated to analyze colloid retention at air-water interface (AWI), solid-water interface (SWI), and air-water-solid interface (AWS). Results show that colloid retention decreases due to increase in electrostatic repulsion and Born repulsion as well as decrease in Lewis acid-base attraction and hydrophobic interactions. Water content effect and hydrophobic effect on colloid retention become more predominant in the solution of higher ionic strength. Colloid retention at AWI is minimal (i.e., due to nonexistence of primary and secondary minima) at the ionic strengths < 75 mM. Capillary potential energy (107–108 KBT) of colloids is 4–5 orders of magnitude greater than the extended DLVO interaction energy (~ 103 KBT), suggesting that capillary retention at AWS is the primary mechanism controlling colloid retention in unsaturated porous media. Results from this study show that immobile solid phase (e.g., soil) could be much more important than air phase in determining colloid retention in unsaturated porous media under unfavorable conditions, especially in the solutions of high ionic strengths.


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