Transport and Retention of Sulfidized Silver Nanoparticles in Porous Media, CT, experiments, Porenet 0 8861

Projekt
Department BOPHY
Beschreibung
Water Resources Research
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 Köhne, George Metreveli, and Hans‐Jörg Vogel

10.1029/2020WR027074

Abstract 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.
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URI
http://www.ufz.de/record/dmp/archive/8861
Thema
Transport Experiments, Nanoparticles, Porous Media, Hydrus Model, CT, Porenet
Datenart
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Urheber
Leuther, Frederic
Köhne, John Maximilian
Vogel, Hans-Jörg
Herausgeber
Helmholtz-Zentrum für Umweltforschung
Rechteinhaber
Helmholtz-Zentrum für Umweltforschung
Zeitpunkt oder -bereich der Erzeugung der Daten
2018 - 2020
Sprache des Inhalts
Deutsch
Englisch
Zugriffsrechte
beschränkter Zugriff