Volume 90 Issue 14 | p. 6 | News of The Week
Issue Date: April 2, 2012

Removing Radioactivity

ACS Meeting News: Nanoparticles strip radioactive strontium and other heavy metals from beverages
Department: Science & Technology
News Channels: Environmental SCENE, Materials SCENE, Nano SCENE
Keywords: Radioactive strontium, Nanoparticles, Arsenic
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Yellow pellets composed of CaWO4 nanoparticles can be used to remove radioactive Sr from liquids, such as milk.
Credit: Courtesy of Allen Apblett
Pellets composed of nanoparticles can be used to decontaminate radioactive liquids, such as milk
 
Yellow pellets composed of CaWO4 nanoparticles can be used to remove radioactive Sr from liquids, such as milk.
Credit: Courtesy of Allen Apblett

Pellets capable of removing radioactive isotopes and heavy metals from milk, juice, and other beverages have been developed by chemists at Oklahoma State University. The material could be used to remove heavy metals from contaminated juices and other foodstuffs. And in emergency situations, such as the one that took place at the Fukushima nuclear plant in Japan last year, it could remove radioactive particles from liquids.

After the Fukushima accident, radioactive 89Sr was identified in milk as far afield as Hilo, Hawaii, according to EPA. Milk is the primary vector for human exposure to radioactive Sr, which tends to accumulate in bones and bone marrow and has been linked to bone cancer and leukemia.

Chemistry professor Allen Apblett and his team had been using nanoparticles to remove uranium from water, but after the events at Fukushima, they realized their technology could be made to take Sr out of liquids. He presented the work at the American Chemical Society national meeting in San Diego last week.

The group’s technology uses calcium tungstate (CaWO4) nanoparticles, which swap Ca ions for Sr ions. The tungstate preferentially binds to Sr ions, instead of Ca ions, because of the former’s larger radius.

“It’s a chemical reaction that works its way from the outside of the particle to the core,” Apblett told C&EN.

The particles the group uses to make the pellets are 40–150 nm in diameter. The smaller the particle, Apblett said, the greater the total surface area, and therefore the higher the reactivity. The pellets are made by attaching the particles to alumina supports.

Apblett envisions loading the pellets into a porous cartridge, which consumers could put into a gallon of milk overnight. In the morning, they’d simply remove the cartridge from the decontaminated milk.

Apblett’s team has also prepared iron-based nanoparticles that can remove arsenic and other heavy metals from apple juice as well as liquids, such as baby formula, prepared with brown rice syrup. High arsenic concentration in these foodstuffs has been a recent concern.

“This work demonstrates how nanotechnology can be effectively and simply employed to solve a real-world problem,” comments Andrew R. Barron, a nanotechnology expert at Rice University. “More importantly, it is invisible as nanotechnology to the end user; it is just a product that works where no similar solution is possible.”


C&EN Covers The ACS National Meeting

Want the scoop on the ACS meeting in San Diego? Check out C&EN Picks, a series of videos that spotlight sessions selected by C&EN staff. Reporters also fan out across the meeting to bring you news coverage. Find it all collected at C&EN's meeting page, cenatacs.tumblr.com.


 
Chemical & Engineering News
ISSN 0009-2347
Copyright © American Chemical Society
Comments
Dr. David Eckensberger (Mon Apr 02 05:42:17 EDT 2012)
Really great work with high potential. And when Anrew Barron comments: "This work demonstrates how nanotechnology can be effectively and simply employed to solve a real-world problem". one has to support this statement. But his following comment: "More importantly, it is invisible as nanotechnology to the end user; it is just a product that works where no similar solution is possible", should be seen more differentiated in my view. It might reflect US-citizens more technology-positive position, but in Europe - at least in Germany - such 'hiding' of a technology would easier lead to distrust of the consumers rather than acceptance.

Nanotechnology is a great opportunity for today's and future applications. I don't think it's necessary to hide it. Stand up and show the world the benefits of responsible nanotechnology.
Bruce Rising (Thu Apr 12 15:52:25 EDT 2012)
I'm impressed; and hopefully this will reach the markets sooner rather than later

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