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
Nanoscale Chemical Imaging of Nanoparticles under Real-World Wastewater Treatment Conditions
Miguel A. Gomez-Gonzalez,Mohamed A. Koronfel,Huw Pullin,Julia E. Parker,Paul D. Quinn,Maria Dias Inverno,Thomas Bligh Scott,Fang Xie,Nikolaos Voulvoulis,Marian L. Yallop,Mary P. Ryan,Alexandra E. Porter +11 more
Journal ArticleDOI
Differential Expression of Mitochondrial Manganese Superoxide Dismutase (SOD) in Triticum aestivum Exposed to Silver Nitrate and Silver Nanoparticles.
TL;DR: Exposure to both AgNPs and Ag ions led to a significant increase in MnS OD expression, but AgNO 3 changed the MnSOD expression faster than AgN Ps, therefore, it is suggested that AgNO3 has greater penetrability and effectiveness.
Book ChapterDOI
Green Nanotechnology: The Solution to Sustainable Development of Environment
TL;DR: In this paper, the authors highlighted the characteristics, goals, and various issues in concern of this potential field as an ultimate solution for sustainable development of environment, highlighting the characteristics of green nanotechnology as an eco-friendly alternative technology for nanotechnology products.
Journal ArticleDOI
The Fate of Anthropogenic Nanoparticles, nTiO2 and nCeO2, in Waste Water Treatment
TL;DR: In this article, the feasibility of single particle mass spectroscopy (sp-ICP-MS) was tested to determine the anthropogenic nanoparticles load in the wastewater treatment process, and the results showed that nTiO2 and nCeO2 are adsorbed to at least 90 percent of the sludge.
Book ChapterDOI
Challenges and current approaches toward environmental monitoring of nanomaterials
Geert Cornelis,Jani Tuoriniemi,Manuel D. Montaño,Stephan Wagner,Julian A. Gallego-Urrea,Karin Mattsson,Andreas Gondikas +6 more
TL;DR: In this paper, the authors discuss the techniques that can currently distinguish ENMs from naturally occurring particles at realistic concentration detection limits without a tedious sample pretreatment procedure without a sample pre-treatment procedure.
References
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Bruce Ravel,Matthew Newville +1 more
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Journal ArticleDOI
The bactericidal effect of silver nanoparticles
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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.
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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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