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Findings on Environmental Science and Technology Discussed by Investigators at Virginia Tech (Controlled Evaluation of Silver Nanoparticle...

September 12, 2014



Findings on Environmental Science and Technology Discussed by Investigators at Virginia Tech (Controlled Evaluation of Silver Nanoparticle Sulfidation in a Full-Scale Wastewater Treatment Plant)

By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Current study results on Environmental Science and Technology have been published. According to news reporting from Blacksburg, Virginia, by VerticalNews journalists, research stated, "Sulfidation of silver nanoparticles (AgNPs), which is known to alter AgNP toxicity, occurs during transport through wastewater treatment plants. In this study, arrays of immobilized AgNPs fabricated by nanosphere lithography (NSL) were used to study AgNP sulfidation in a full-scale wastewater treatment plant (WWTP)."

The news correspondents obtained a quote from the research from Virginia Tech, "A detailed laboratory study preceded field deployment. The characteristic NSL pattern remained discernible by atomic force microscopy and transmission electron microscopy after both lab and field exposures. Growth of AgNPs due to an increase in density upon sulfidation permitted the study of sulfidation kinetics in the WWTP. Sulfidation occurred almost exclusively in anaerobic zones of the WWTP, where the initial sulfidation rate was 11-14 nm of Ag converted to Ag2S per day. Measurements of the chemical composition and crystallinity of AgNPs exposed to primary influent for similar to 10 d confirmed that they had been converted almost entirely to Ag2S. Laboratory experiments revealed that the sulfidation process is not uniform and that partially sulfidized AgNPs retain the potential to release toxic Ag+ ions. The results indicate that primary AgNPs are sulfidized directly without dissolving and forming secondary precipitates."

According to the news reporters, the research concluded: "This study demonstrates the utility of immobilized AgNPs for detailed, in situ investigations of nanomaterial tranformations."

For more information on this research see: Controlled Evaluation of Silver Nanoparticle Sulfidation in a Full-Scale Wastewater Treatment Plant. Environmental Science & Technology, 2014;48(15):8564-8572. Environmental Science & Technology can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Environmental Science & Technology - www.pubs.acs.org/journal/esthag)

Our news journalists report that additional information may be obtained by contacting R.D. Kent, Virginia Technical, Center Environm Implicat Nanotechnol CEINT, Blacksburg, VA 24061, United States. Additional authors for this research include J.G. Oser and P.J. Vikesland.

Keywords for this news article include: Blacksburg, Virginia, United States, North and Central America, Environmental Science and Technology

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Ecology, Environment & Conservation


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