Interfacial Adsorption Behavior of a Structurally Optimized AMP@MIL-101(Cr) Composite for Efficient Rubidium Recovery...

Area of Science:

• Materials Science
• Environmental Chemistry
• Inorganic Chemistry

Background:

• Rubidium recovery from aqueous solutions is crucial for various industrial applications.
• Developing efficient and selective adsorbents is essential for sustainable resource management.

Purpose of the Study:

• To synthesize and characterize a novel composite adsorbent, AMP@MIL-101(Cr), for rubidium ion (Rb+) adsorption.
• To evaluate the adsorption performance, mechanism, and stability of the synthesized adsorbent.

Main Methods:

• Composite adsorbent synthesis via integration of ammonium phosphomolybdate (AMP) with MIL-101(Cr).
• Structural characterization using advanced techniques.
• Adsorption studies including kinetics, isotherm, and thermodynamics.
• Selective adsorption tests in a complex matrix (Nanyi Mountain Oilfield).
• Evaluation of adsorption-desorption cycles for stability.

Main Results:

• AMP@MIL-101(Cr) demonstrated excellent structural stability after Rb+ adsorption.
• The adsorption process followed single-layer chemisorption, was endothermic, spontaneous, and pH-independent.
• High Rb+ adsorption capacity of 69.4 mg·g⁻¹ was achieved within 5 minutes.
• The adsorbent exhibited high selectivity for Rb+ over other common ions.
• Maintained 86.72% of adsorption capacity after 5 cycles.

Conclusions:

• AMP@MIL-101(Cr) is a highly efficient, stable, and selective adsorbent for rubidium ion recovery.
• The material shows significant potential for practical applications in rubidium extraction from aqueous solutions.
• The findings contribute to the development of advanced materials for resource recovery and environmental remediation.