Abstract
Separation and recovery of metal ions with high value from industrial wastewaters is of significance due to the shortage of metal resources. A stable Al-based metal-organic framework (MOF-303) was used to selectively capture Cu2+ from Cu2+/Ni2+ and Cu2+/Co2+ binary systems. Due to the unique chelation effect of dual-pyrazol sites that are distributed parallel with the direction of the 1D channel, MOF-303 exhibited simultaneously a large capacity towards Cu2+ (330 mg g−1) and high separation selectivity (6076 and 2662 for Cu2+/Ni2+ and Cu2+/Co2+ respectively). The optimal pH for separation was found to 3.0–5.5, and the separation equilibrium was achieved at 3–4 h. Further, the recovery of the metals especially for Ni2+ and the regeneration of MOF-303 were achieved through a designed process. The Cu2+ selective adsorption mechanism based on the synergistic dual-pyrazol sites in MOF-303 was analyzed via a combination of experimental method and theoretical calculation. In conclusion, this work not only demonstrates MOF-303 is a promising adsorbent for the separation and recovery of the metals, but also highlights the unique dual-pyrazol sites in MOFs that can boost metal ions separation and recovery.
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