MOF-derived MoO₂/C composites as high-performance electrodes for electrochemical uranium(vi) removal

Area of Science:

• Materials Science
• Environmental Science
• Electrochemistry

Background:

• Uranium contamination in water poses significant environmental and health risks.
• Developing efficient and stable materials for uranium removal is crucial for environmental remediation.
• Electroadsorption offers a promising method for contaminant removal from aqueous solutions.

Purpose of the Study:

• To synthesize and characterize an octahedral MoO2/C composite for uranium electro-adsorption.
• To evaluate the adsorption capacity, stability, and reusability of the synthesized material.
• To demonstrate a novel strategy for designing high-performance electrode materials for uranium removal.

Main Methods:

• Synthesis of an octahedral MoO2/C composite via calcination of a molybdenum-based metal-organic framework (MOF) precursor.
• Electrochemical characterization and performance testing for U(vi) adsorption.
• Adsorption-desorption cycling experiments to assess material stability and reusability.

Main Results:

• The octahedral MoO2/C composite exhibited a high U(vi) adsorption capacity of 806.79 mg g⁻¹ from a 300 mg L⁻¹ initial solution at 1.2 V for 5 h.
• The material demonstrated excellent structural stability and maintained over 65% U(vi) removal after ten adsorption-desorption cycles.
• The Na2CO3 eluent (0.1 mol L⁻¹) facilitated efficient desorption and regeneration of the electrode material.

Conclusions:

• The synthesized octahedral MoO2/C composite is a highly effective electrode material for U(vi) electro-adsorption.
• The unique octahedral architecture contributes to enhanced adsorption performance and structural integrity.
• This study presents a viable design strategy for advanced materials in uranium remediation technologies.