Journal ArticleDOI
Behavior of Metallic Silver Nanoparticles in a Pilot Wastewater Treatment Plant
Ralf Kaegi,Andreas Voegelin,Brian Sinnet,S. Zuleeg,Harald Hagendorfer,Michael Burkhardt,Hansruedi Siegrist +6 more
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Results from batch experiments suggested that Ag-NP transformation to Ag(2)S occured in the nonaerated tank within less than 2 h, which must be considered in future risk assessments.Abstract:
We investigated the behavior of metallic silver nanoparticles (Ag-NP) in a pilot wastewater treatment plant (WWTP) fed with municipal wastewater. The treatment plant consisted of a nonaerated and an aerated tank and a secondary clarifier. The average hydraulic retention time including the secondary clarifier was 1 day and the sludge age was 14 days. Ag-NP were spiked into the nonaerated tank and samples were collected from the aerated tank and from the effluent. Ag concentrations determined by inductively coupled plasma-mass spectrometry (ICP-MS) were in good agreement with predictions based on mass balance considerations. Transmission electron microscopy (TEM) analyses confirmed that nanoscale Ag particles were sorbed to wastewater biosolids, both in the sludge and in the effluent. Freely dispersed nanoscale Ag particles were only observed in the effluent during the initial pulse spike. X-ray absorption spectroscopy (XAS) measurements indicated that most Ag in the sludge and in the effluent was present a...read more
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Journal ArticleDOI
AgAu nanoclusters supported on zeolites: Structural dynamics during CO oxidation
I. López-Hernández,Vera Truttmann,Clara Garcia,Christian W. Lopes,Christoph Rameshan,Michael Stöger-Pollach,Noelia Barrabés,Günther Rupprechter,Fernando Rey,Antonio E. Palomares +9 more
TL;DR: In this paper, in situ XAFS and DRIFTS were used to study the dynamic evolution of the metal active sites in bimetallic AgxAu25-x nanoclusters supported on ITQ2 zeolite during the CO catalytic oxidation.
Journal ArticleDOI
Transfer of sulfidized silver from silver nanoparticles, in sewage sludge, to plants and primary consumers in agricultural soil environment
TL;DR: In this article, the transfer of Ag from consumer products containing silver nanoparticles (AgNPs) and sulfidized Ag into plants and primary consumers has been examined, and the transfer potential of Ag could have consequences for food webs due to chronic exposure linked to SS spreading practices.
Book ChapterDOI
Environmental Fate and Exposure Modeling of Nanomaterials
TL;DR: In this paper, the processes that govern the environmental fate of engineered nanomaterials (ENMs) and how these processes can be represented in environmental fate models for ENMs are described.
Journal ArticleDOI
Influence of colloidal particles with bimodal size distributions on retention and pressure drop in ultrafiltration membranes
TL;DR: In this article, an electrospray-scanning mobility particle sizer method was used for characterizing the concentration of each component in mixtures, and a series of filtration tests for 0.03 µm rated polyethersulfone membrane against mixtures of different sized polystyrene latex particles was performed.
Journal ArticleDOI
Silver nanoparticles temporarily retard NO2− production without significantly affecting N2O release by Nitrosomonas europaea
TL;DR: The results suggest that AgNP release to sewage treatment plants and land application of AgNP‐containing biosolids should be minimized because of their potential temporary stimulation of N2O release and interference with nitrification.
References
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Journal ArticleDOI
ATHENA, ARTEMIS, HEPHAESTUS: data analysis for X-ray absorption spectroscopy using IFEFFIT.
Bruce Ravel,Matthew Newville +1 more
TL;DR: A software package for the analysis of X-ray absorption spectroscopy (XAS) data is presented, based on the IFEFFIT library of numerical and XAS algorithms and is written in the Perl programming language using the Perl/Tk graphics toolkit.
Journal ArticleDOI
The bactericidal effect of silver nanoparticles
Jose Ruben Morones,Jose Luis Elechiguerra,A. Camacho,Katherine B. Holt,Juan B. Kouri,Jose Tapia Ramirez,Miguel Jose Yacaman +6 more
TL;DR: The results indicate that the bactericidal properties of the nanoparticles are size dependent, since the only nanoparticles that present a direct interaction with the bacteria preferentially have a diameter of approximately 1-10 nm.
Journal ArticleDOI
Silver nanoparticles as antimicrobial agent: a case study on E. coli as a model for Gram-negative bacteria
Ivan Sondi,Branka Salopek-Sondi +1 more
TL;DR: These nontoxic nanomaterials, which can be prepared in a simple and cost-effective manner, may be suitable for the formulation of new types of bactericidal materials.
Journal ArticleDOI
Does the antibacterial activity of silver nanoparticles depend on the shape of the nanoparticle? A study of the Gram-negative bacterium Escherichia coli.
TL;DR: This is the first comparative study on the bactericidal properties of silver nanoparticles of different shapes, and the results demonstrate thatsilver nanoparticles undergo a shape-dependent interaction with the gram-negative organism E. coli.
Journal ArticleDOI
Modeled Environmental Concentrations of Engineered Nanomaterials (TiO2, ZnO, Ag, CNT, Fullerenes) for Different Regions
TL;DR: The results of this study indicate that risks to aquatic organisms may currently emanate from nano- Ag, nano-TiO(2), and nano-ZnO in sewage treatment effluents for all considered regions and for nano-Ag in surface waters.
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