000153727 001__ 153727
000153727 005__ 20210129213758.0
000153727 020__ $$a978-3-89336-957-7
000153727 0247_ $$2Handle$$a2128/6751
000153727 0247_ $$2ISSN$$a1866-1793
000153727 037__ $$aFZJ-2014-03223
000153727 041__ $$aEnglish
000153727 1001_ $$0P:(DE-Juel1)138954$$aLiang, Yan$$b0$$eCorresponding Author$$ufzj
000153727 245__ $$aTransport and Retention of Stabilized Silver Nanoparticles in Porous Media$$f - 2014
000153727 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2014
000153727 300__ $$aIV, 109 S.
000153727 3367_ $$2DataCite$$aOutput Types/Dissertation
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000153727 3367_ $$2ORCID$$aDISSERTATION
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000153727 3367_ $$02$$2EndNote$$aThesis
000153727 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1598602272_5361
000153727 3367_ $$2DRIVER$$adoctoralThesis
000153727 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v212
000153727 502__ $$aDissertation, RWTH Aachen, 2014$$bDissertation$$cRWTH Aachen$$d2014
000153727 520__ $$aDue to the widespread application of silver nanoparticles (AgNPs) and the resulting potential exposure in the environment, information about their environmental transport and fate is essential for risk assessment. AgNPs are commonly modified with functional groups, surfactants, or polymers to increase their stability in liquids and the surface modification greatly influences the environmental behavior of AgNPs. The aim of this study is therefore to investigate the transport and retention of surfactant-stabilized AgNPs under environmentally relevant conditions. Experiments were conducted with water-saturated columns packed with quartz sand, around 90% water-saturated columns filled with undisturbed loamy sand soil, and a lysimeter. Inductively coupled plasma-mass spectrometry/optical emission spectrometry (ICP-MS/OES) was used to analyze the concentrations of AgNPs, Ca$^{2+}$ , K+, Fe, and Al. The experimental breakthrough curves (BTCs) and retention profiles (RPs) from column experiments were described using a numerical model that considers time- and depth-dependent retention. Column experiments with quartz sand packing were also conducted in the presence of surfactant to deduce the influence of surfactant on AgNP transport, especially on the spatial distribution of retained AgNPs that determines the long-term transport potential. In addition, to better understand the interactions of AgNPs and the matrix in the environment, remobilization of retained AgNPs from undisturbed soil was studied by changing the solution chemistry such as change of cation types and ionic strength reduction. Experimental results showed that the normalized concentration in BTCs for AgNPs obtained from water-saturated columns increased with a decrease in solution ionic strength (IS), and an increase in flow velocity ($\textit{q}$), sand grain size, and input concentration (C$_{o}$). In contrast to the conventional filtration theory, RPs in sand exhibited uniform, nonmonotonic, or hyperexponential shapes that were sensitive to physicochemical conditions. The simulated retention rate coefficient (k$_{1}$) and maximum retained concentration on the solid phase (S$_{max}$) increased with IS and as the grain size and/or C$_{o}$ decreased. The RPs were more hyperexponential in finer textured sand and at lower C$_{o}$ because of their higher values of S$_{max}$, which indicated a larger retention capacity of the porous media. Conversely, RPs were nonmonotonic or uniform at higher C$_{o}$ and in coarser sand that had lower values of S$_{max}$, and tended to exhibit higher peak concentrations in the RPs at lower flow velocities and at higher solution IS. These observations indicate that uniform and nonmonotonic RPs occurred under conditions when S$_{max}$ was filled. The sensitivity of the nonmonotonic RPs to IS and flow velocity in coarser textured sand indicates that AgNPs were partially interacting in a secondary energy minimum according to the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. However, elimination of the secondary minimum only produced recovery of a small portion (<10%) of the retained AgNPs. These results imply that AgNPs were largely irreversibly interacting in a primary minimum associated with microscopic heterogeneity of the porous [...]
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000153727 536__ $$0G:(DE-HGF)POF3-255$$a255 - Terrestrial Systems: From Observation to Prediction (POF3-255)$$cPOF3-255$$fPOF III$$x1
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000153727 773__ $$y2014
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000153727 9132_ $$0G:(DE-HGF)POF3-255$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$aDE-HGF$$bMarine, Küsten- und Polare Systeme$$lTerrestrische Umwelt$$vTerrestrial Systems: From Observation to Prediction$$x0
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000153727 9131_ $$0G:(DE-HGF)POF3-255$$1G:(DE-HGF)POF3-250$$2G:(DE-HGF)POF3-200$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bErde und Umwelt$$lTerrestrische Umwelt$$vTerrestrial Systems: From Observation to Prediction$$x1
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