Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027074 |
Transport and retention of sulfidized silver nanoparticles in porous media: The role of air‐water interfaces, flow velocity, and natural organic matter | |
Frederic Leuther; John Maximilian Kö; hne; George Metreveli; Hans‐; Jö; rg Vogel | |
2020-08-15 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | The sulfidation and aging of silver nanoparticles (Ag‐NPs) with natural organic matter (NOM) are major transformation processes along their pathway in wastewater treatment plants and surface waters. Although soils appear to be a sink for disposed Ag‐NPs, the impact of variable saturation on the transport and retention behavior in porous media is still not fully understood. We studied the behavior of sulfidized silver nanoparticles (S‐Ag‐NPs, 1 mg L‐1) in saturated and unsaturated sand columns regarding the effects of i) the presence of NOM (5 mg L‐1) in the aquatic phase on retention, transport, and remobilization of S‐Ag‐NPs and ii) the distribution and quantity of air‐water and solid‐water interfaces for different flow velocities determined via X‐ray microtomography (X‐ray μCT). Unsaturated transport experiments were conducted under controlled conditions with unit gradients in water potential and constant water content along the flow direction for each applied flux. It was shown that i) NOM in S‐Ag‐NP dispersion highly increased the NP‐mobility; ii) differences between saturated and unsaturated transport were increasing with decreasing flux and, consequently, decreasing water contents; iii) both, solid‐water and air‐water interfaces were involved in retention of S‐Ag‐NPs aged by NOM. Using numerical model simulations and X‐ray μCT of flow experiments, the breakthrough of Ag‐NP could be explained by a disproportional increase in air‐water interfaces and an increasing attachment efficiency with decreasing water content and flow velocity. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/287773 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Frederic Leuther,John Maximilian Kö,hne,等. Transport and retention of sulfidized silver nanoparticles in porous media: The role of air‐water interfaces, flow velocity, and natural organic matter[J]. Water Resources Research,2020. |
APA | Frederic Leuther.,John Maximilian Kö.,hne.,George Metreveli.,Hans‐.,...&rg Vogel.(2020).Transport and retention of sulfidized silver nanoparticles in porous media: The role of air‐water interfaces, flow velocity, and natural organic matter.Water Resources Research. |
MLA | Frederic Leuther,et al."Transport and retention of sulfidized silver nanoparticles in porous media: The role of air‐water interfaces, flow velocity, and natural organic matter".Water Resources Research (2020). |
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