期刊
CHEMICAL ENGINEERING JOURNAL
卷 410, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128431
关键词
Metal-organic framework; Dual-pyrazol sites; Adsorption and separation; Metal recovery
资金
- National Natural Science Foundation of China [52071227, 21978212, 21808201]
- Key Research Project of Shanxi Province [201903D111008]
- Science and Technology Major Projects of Shanxi Province [20191102004]
- Scientific and Technological Innovation Project of University in Shanxi Province [2019L0657]
The study demonstrated the successful separation and selective capture of Cu2+ using stable MOF-303, showing high adsorption capacity and separation selectivity. Experimental results indicate that MOF-303 is a promising adsorbent for metal separation and recovery.
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 dualpyrazol 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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