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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The Effects of Low Concentrations of Silver Nanoparticles on Wheat Growth, Seed Quality, and Soil Microbial Communities
Guangfu Liu,Meng Zhang,Yujian Jin,Xiaoji Fan,Jiahui Xu,Youchao Zhu,Zhengwei Fu,Xiangliang Pan,Haifeng Qian,Haifeng Qian +9 more
TL;DR: In this article, the authors evaluated wheat growth and seed quality after exposure to low concentration of AgNPs while characterizing the composition of the associated soil microbial community by high-throughput sequencing of 16S rRNA genes.
Journal ArticleDOI
Transformation of silver ions to silver nanoparticles mediated by humic acid under dark conditions at ambient temperature.
TL;DR: It is found that Ag+ at environmentally relevant concentrations (as low as 1 μg/L) could be reduced to AgNPs by Suwannee River humic acid (SRHA) in darkness at 30 °C and the reaction mechanism probed by X-ray absorption fine structure spectroscopy revealed that Ag- was first bound to the carboxylic groups of SRHA to form Ag-SRHA ligands, which were then reduced to metallic Ag.
Journal ArticleDOI
Nanoparticle aggregation in a freshwater river: the role of engineered surface coatings
Mark C. Surette,Jeffrey A. Nason +1 more
TL;DR: In this article, the effect of engineered surface coatings on ENP colloidal stability in complex aquatic mediums is explored. But, the results of the batch experiments demonstrate that engineered surface coating can affect ENPcolloidal stability, further highlighting the need to consider the environmental fate of ENPs.
Journal ArticleDOI
Non-labile silver species in biosolids remain stable throughout 50 years of weathering and ageing
Erica Donner,Erica Donner,Kirk G. Scheckel,Ryo Sekine,Rachel S. Popelka-Filcoff,John W. Bennett,Gianluca Brunetti,Ravi Naidu,Stephen McGrath,Enzo Lombi +9 more
TL;DR: It is indicated that at the time of soil application, biosolids Ag will be predominantly Ag-sulfides and characterised by low isotopic lability.
Journal ArticleDOI
Dairy processing sludge and co-products: A review of present and future re-use pathways in agriculture
W. Shi,W. Shi,Mark G. Healy,S.M. Ashekuzzaman,Karen Daly,James J. Leahy,Owen Fenton,Owen Fenton +7 more
TL;DR: In this paper, a review identifies a need to quantify antimicrobial drugs, hormones, pesticides, disinfectants, persistent organic pollutants (POPs), microplastics and nano-particles in all DPS and STRUBIAS types.
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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