Understanding the chemistry of ionic liquids for nuclear fuel reprocessing

September 12, 2006

With the rising cost and dwindling supply of fossil fuels, nuclear power may again be considered a plausible energy option in the U.S. Safety is the public's major concern, and researchers at the U.S. Department of Energy's Brookhaven National Laboratory are addressing one important aspect of that issue by investigating materials called ionic liquids. If these liquid salts were to be used in nuclear fuel reprocessing – the chemical removal of reusable nuclear material from spent nuclear reactor fuel – the risk of unintended nuclear chain reactions may be substantially reduced.

Brookhaven Lab chemist James Wishart presented his research on how ionic liquids containing the element boron react with radiation at the 232nd national meeting of the American Chemical Society in San Francisco.

Ionic liquids, which contain only electrically charged molecules known as ions, have several properties that make them attractive as an alternative medium for nuclear fuel reprocessing. These include low volatility, low combustibility, and resistance to being electrochemically oxidized or reduced. In 2001, researchers at DOE's Los Alamos National Laboratory calculated that reprocessing plutonium in boron-containing ionic liquids could substantially reduce the risk of nuclear accidents that involve unintended chain reactions. A particular isotope of boron can "poison" a chain reaction by strongly absorbing the neutrons that propagate the chain.

"Compared to current aqueous systems used for reprocessing plutonium, boron-containing ionic liquids can hold up to a hundred times more dissolved plutonium before reaching the critical threshold – that is, before the plutonium sustains a nuclear chain reaction," Wishart said. "Thus, there would be far less chance of an accident."

There are several ways to include boron in ionic liquids. One direct way is to make ionic liquids using negatively charged ions, called anions, that contain boron. This method may not produce a liquid with the melting point or viscosity needed. Another way is to add a material containing a lot of boron – for example, carborane – to an ionic liquid with the desired melting point, viscosity and other properties.

Brookhaven's Wishart and former postdoctoral researchers Tomasz Szreder and Alison Funston, with collaborators from the University of California, Riverside, have investigated the radiation chemistry of ionic liquids prepared from carborane and a boron-containing anion. They found that electrons ejected from molecules by radiation leads to decomposition of the carborane. To prevent this decomposition, the researchers propose including positively charged ions, like pyridinium, that can intercept the electrons before they react with the carborane. The reactions are reversible so the materials can be used over and over again.

"In U.S. nuclear power reactors, the fuel is only used once-through and a lot of energy remains in the spent fuel that is destined for disposal," Wishart said. "In the future, we may instead reprocess fuel to use in current reactors and in a new type of reactor now under development. We would extract more energy from the same amount of natural resources and produce less nuclear waste. Advanced reprocessing would also reduce long-lived radioactive waste. The ionic liquids that we study could be a better medium for reprocessing nuclear fuel and nuclear waste than the currently used media."

Source: Brookhaven National Laboratory

Explore further: Modeling mechanical stress in solid-state lithium batteries yields insights into battery microstructure

Related Stories

Surface properties command attention

October 17, 2014

Whether working on preventing corrosion for undersea oil fields and nuclear power plants, or for producing electricity from fuel cells or oxygen from electrolyzers for travel to Mars, associate professor of nuclear science ...

Recommended for you

Short wavelength plasmons observed in nanotubes

July 28, 2015

The term "plasmons" might sound like something from the soon-to-be-released new Star Wars movie, but the effects of plasmons have been known about for centuries. Plasmons are collective oscillations of conduction electrons ...

New chemistry makes strong bonds weak

July 28, 2015

Researchers at Princeton have developed a new chemical reaction that breaks the strongest bond in a molecule instead of the weakest, completely reversing the norm for reactions in which bonds are evenly split to form reactive ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.