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DOI | 10.1016/j.jhydrol.2014.09.053 |
Laboratory assessment of the mobility of water-dispersed engineered nanoparticles in a red soil (Ultisol) | |
Wang, Dengjun1,4; Su, Chunming2; Zhang, Wei3; Hao, Xiuzhen1; Cang, Long1; Wang, Yujun1; Zhou, Dongmei1 | |
发表日期 | 2014-11-27 |
ISSN | 0022-1694 |
卷号 | 519页码:1677-1687 |
英文摘要 | Soils are major sinks of engineered nanoparticles (ENPs) as results of land applications of sewage sludge, accidental spills, or deliberate applications of ENPs (e.g., nano-pesticides). In this study, the transport behaviors of four widely used ENPs (i.e., titanium dioxide [TiO2], buckminsterfullerene [C-60], single-walled carbon nanotube [SWNT], and elemental silver [Ag-0]) were investigated in water-saturated columns packed with either a quartz sand, a red soil (Ultisol), or sand/soil mixtures with soil mass fraction (lambda) from 0% to 100% at slightly acidic solution pH (4.0-5.0). The mobility of tested ENPs decreased significantly with increasing lambda, which was attributed to increased surface area and/or retention sites imparted by iron oxides, clay minerals, and organic matter in the red soil. Breakthrough curves of all ENPs exhibited blocking effects (decreasing deposition rate over time) and were well-described using an unfavorable and favorable, two-site kinetic attachment model accounting for random sequential adsorption on the favorable site. Modeled maximum retention capacity and first-order attachment rate coefficient on the favorable site both increased linearly with increasing lambda, suggesting that transport parameters of ENPs in natural soils may be accurately extrapolated from transport parameters in the sand/soil mixtures. In addition, the mobility of three negatively charged ENPs (C-60, SWNT, and Ag-0 NPs) was reversely correlated with their average hydrodynamic diameters, highlighting that the average hydrodynamic diameter of negatively charged ENPs is the dominant physicochemical characteristics controlling their mobility in the Ultisol. (C) 2014 Elsevier B.V. All rights reserved. |
英文关键词 | Engineered nanoparticle;Red soil;Ultisol;Transport;Modeling;Porous media |
语种 | 英语 |
WOS记录号 | WOS:000347018100036 |
来源期刊 | JOURNAL OF HYDROLOGY
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来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/60417 |
作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China; 2.US EPA, Ground Water & Ecosyst Restorat Div, Natl Risk Management Res Lab, Off Res & Dev, Ada, OK 74820 USA; 3.Michigan State Univ, Dept Plant Soil & Microbial Sci, Environm Sci & Policy Program, E Lansing, MI 48824 USA; 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Dengjun,Su, Chunming,Zhang, Wei,et al. Laboratory assessment of the mobility of water-dispersed engineered nanoparticles in a red soil (Ultisol)[J]. 美国环保署,2014,519:1677-1687. |
APA | Wang, Dengjun.,Su, Chunming.,Zhang, Wei.,Hao, Xiuzhen.,Cang, Long.,...&Zhou, Dongmei.(2014).Laboratory assessment of the mobility of water-dispersed engineered nanoparticles in a red soil (Ultisol).JOURNAL OF HYDROLOGY,519,1677-1687. |
MLA | Wang, Dengjun,et al."Laboratory assessment of the mobility of water-dispersed engineered nanoparticles in a red soil (Ultisol)".JOURNAL OF HYDROLOGY 519(2014):1677-1687. |
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