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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Influence of biochar incorporation on the collector surface properties and the transport of silver nanoparticles in porous media.
TL;DR: In this paper , different mass ratios of biochar were added to packed sand with a rough or smooth surface to determine the significance of Biochar on the retention and release of silver nanoparticles (AgNPs).
Journal ArticleDOI
Comparison of MAPK and thioredoxin gene expression in wheat seedlings exposed to silver nitrate and silver nanoparticle
Javad Karimi,Sasan Mohsenzadeh +1 more
TL;DR: It is found that wheat seedlings might develop different strategies to cope with AgNO3 and AgNPs toxicity with change in the expression of MAPK and thioredoxin heavy metal-related genes.
Behaviour of silver and silver sulfide nanoparticles in the environment: effects on wastewater treatment processes and soil organisms
TL;DR: In this article, the authors present a series of publications arising from this thesis, including a statement of authorship and a Declaration of Interest (Declaration of Interest) and Statement of Authorship.
Journal ArticleDOI
The effect of sulfidation and soil type on the uptake of silver nanoparticles in annelid Enchytraeus crypticus.
TL;DR: In this article , the authors compared the uptake and elimination kinetics in the annelid Enchytraeus crypticus of AgNPs with different core sizes and coatings in Lufa 2.2, Dorset, and Woburn soils.
Transformation and Effects of Silver and Copper Oxide Nanoparticles during Treatment and after Land Application of Sludge
TL;DR: In this article, the authors evaluated the transformation of AgNPs and CuONPs and their impact on the bacterial community during sludge treatment (anaerobic digestion, chemical conditioning, and lime stabilization) and subsequent land application.
References
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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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