Experimental optimization of uranium (VI) extraction using emulsion liquid membrane: a response surface methodology...

Area of Science:

• Chemical Engineering
• Environmental Science
• Materials Science

Background:

• Uranium (VI) extraction from aqueous solutions is crucial for nuclear fuel reprocessing and environmental remediation.
• Emulsion liquid membrane (ELM) technology offers a promising approach for efficient and selective separation processes.

Purpose of the Study:

• To investigate and optimize the extraction of uranium (VI) using an ELM system.
• To determine the influence of key process variables on extraction efficiency and membrane stability.

Main Methods:

• Utilized an ELM system comprising kerosene, di-(2-ethylhexyl) phosphoric acid (D2EHPA), and sorbitan monooleate (Span-80).
• Employed Response Surface Methodology (RSM) with Central Composite Design (CCD) to analyze process variables.
• Optimized parameters included surfactant concentration, stripping solution concentration, feed phase pH, and mixing speed.

Main Results:

• Achieved a maximum uranium (VI) extraction efficiency of 99.94% under optimized conditions.
• Identified optimal parameters: 1.93% Span-80, 0.75 mol/L H2SO4, pH 3.03, and 180.56 rpm mixing speed.
• Demonstrated high membrane stability with low emulsion breakage (0.21%) and swelling (3.29%).

Conclusions:

• The optimized ELM system is highly effective for uranium (VI) extraction from aqueous solutions.
• Feed-phase pH significantly impacts the uranium (VI) pertraction process.
• The developed method ensures efficient uranium recovery and maintains membrane integrity.