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Article Abstract
A novel composite adsorbent, AMP@MIL-101(Cr), has been successfully synthesized by integrating ammonium phosphomolybdate (AMP) with the metal-organic framework MIL-101(Cr) for the efficient adsorption of rubidium ions (Rb) from aqueous solutions. The results of structural characterizations confirmed that the crystalline framework of the adsorbent remained intact after Rb adsorption, indicating excellent structural stability. Adsorption kinetics, isotherm, and thermodynamics studies revealed that the adsorption process followed a single-layer chemisorption mechanism and was an endothermic reaction and spontaneous adsorption process with negligible influence from solution pH. The adsorbent exhibited a remarkable Rb adsorption capacity, reaching 69.4 mg·g within 5 min in a solution containing 250 mg·L Rb at 45 °C. In the Nanyi Mountain Oilfield, the adsorption rate of adsorbent for Rb (10.69%) exceeded that of other ions (Li: 0.75%; Na: 0; K: 0.95%; Mg: 0.67%). Furthermore, the adsorbent still maintained 86.72% of its initial adsorption capacity after 5 consecutive adsorption-desorption cycles. These findings highlighted the great potential of AMP@MIL-101(Cr) as an efficient and stable adsorbent for the selective recovery of rubidium from aqueous environments.
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