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| Influence of EDTA on Transport of Silver Nanoparticles in Saturated Porous Media |
| Received:February 18, 2015 |
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| KeyWord:silver nanoparticle;saturated porous media;ethylenediamine tetraacetic acid(EDTA);transport |
| Author Name | Affiliation | E-mail | | YIN Zi-yi | College of The Environment, Sichuan Agricultural, University, Chengdu 611130
MoE Key Lab for Eco-restoration of Regional Contaminated Environment, Shenyang University, Shenyang 110044 | | | YANG Xin-yao | MoE Key Lab for Eco-restoration of Regional Contaminated Environment, Shenyang University, Shenyang 110044 | yangxinyao@hotmail.com | | CHEN Fang-min | College of The Environment, Sichuan Agricultural, University, Chengdu 611130 | | | DENG Shi-huai | College of The Environment, Sichuan Agricultural, University, Chengdu 611130 | shdeng8888@163.com | | YANG Yue-suo | MoE Key Lab for Eco-restoration of Regional Contaminated Environment, Shenyang University, Shenyang 110044 | |
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| Abstract: |
| The potential environmental risks of silver nanoparticles(AgNP) have aroused many concerns. In this study, batch experiment and triple pulse column test were employed to investigate the interaction of EDTA and AgNP in granular-free quiescent water and the control of EDTA on AgNP transport in flowing water-porous system in different porous media(quartz sand and iron-oxide coated sand) at distinct ionic strengths(IS:1 mmol·L-1 and 300 mmol·L-1). Batch experiments suggested that EDTA could replace the PVP in the AgNP surface at both low and high ISs, resulting in a change of stabilizing mechanisms from the steric effect of PVP to the electrical double layer(EDL) effect of EDTA. Column tests showed that higher IS could suppress the EDL interaction between the AgNP core and the sand surface, thus increasing the deposition; while iron oxide coating on sand reduced sorption sites of the PVP polymer layer, resulting in a reduced deposition rate. EDTA could complex with and dissolve the iron oxide coating on the sand, thus enhancing the rate of the subsequent deposition. Moreover, elution by EDTA did not mobilize the deposited nanoparticles. |
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