Efficient extraction of Rh(III) from nitric acid medium using a hydrophobic ionic liquid

Area of Science:

• Nuclear Chemistry
• Materials Science
• Separation Science

Background:

• Rhodium is a rare platinum-group metal critical for industrial applications.
• Spent nuclear fuel contains valuable and strategic metals requiring efficient recovery methods.
• Developing advanced separation techniques is crucial for resource management and sustainability.

Purpose of the Study:

• To investigate the extraction of rhodium(III) from nitric acid solutions.
• To evaluate the efficacy of hydrophobic ammonium-based ionic liquids combined with extractants like CMPO or TODGA.
• To explore a viable method for rhodium recovery from nuclear waste streams.

Main Methods:

• Liquid-liquid extraction using a hydrophobic ammonium-based ionic liquid.
• Employing carbamoylmethylphosphine oxide (CMPO) or trioctylphosphine oxide (TODGA) as selective extractants.
• Utilizing aqueous nitric acid solutions as the source of rhodium(III).

Main Results:

• Successful extraction of rhodium(III) was achieved.
• The combination of ionic liquid and extractants demonstrated effective rhodium sequestration.
• The process shows promise for separating rhodium from complex matrices.

Conclusions:

• The developed extraction system is effective for rhodium(III) recovery.
• This method has significant implications for recycling rhodium from spent nuclear fuel.
• The findings contribute to increasing the global supply of this valuable rare metal.