An asymmetric pulsed current-assisted electrochemical method for Sr(Ⅱ) extraction using supramolecular composites

Area of Science:

• Environmental Chemistry
• Materials Science
• Electrochemistry

Background:

• Effective strontium extraction from seawater is crucial for environmental and industrial applications.
• Traditional physicochemical adsorption methods face limitations in efficiency and capacity.
• Developing sustainable and economical strontium extraction techniques is a significant challenge.

Purpose of the Study:

• To develop and evaluate an asymmetric pulsed current-assisted electrochemical (AP-CE) method for strontium extraction from seawater.
• To enhance strontium removal efficiency and adsorption capacity compared to conventional methods.
• To investigate the selectivity and mechanism of the AP-CE method for strontium recovery.

Main Methods:

• Utilized an asymmetric pulsed current-assisted electrochemical (AP-CE) technique.
• Employed a carbon electrode modified with dibenzo-18-crown-6-ether and cellulose acetate.
• Applied asymmetric pulsed current to prevent cation blockage and membrane sealing.

Main Results:

• Achieved high strontium removal efficiencies: 99.3% at 10 mg L⁻¹, 97.6% at 20 mg L⁻¹, 97.3% at 50 mg L⁻¹, and 96.1% at 100 mg L⁻¹.
• Demonstrated high strontium adsorption capacities: 14.9 mg g⁻¹ at 10 mg L⁻¹, 29.3 mg g⁻¹ at 20 mg L⁻¹, 73.0 mg g⁻¹ at 50 mg L⁻¹, and 144.2 mg g⁻¹ at 100 mg L⁻¹.
• Exhibited excellent selectivity for strontium adsorption from simulated seawater.

Conclusions:

• The AP-CE method is highly effective for strontium extraction from seawater.
• This electrochemical approach offers superior performance over traditional adsorption techniques.
• The AP-CE method shows significant promise for sustainable and economical strontium recovery from marine resources.