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[MOF-303] Synergistic Dual-Pyrazol Sites of MOFs for Recovery of Transition Metals from Wastewater
Summary:
The authors from Taiyuan University of Science and Technology and Tiangong University developed a metal-organic framework (MOF-303) with synergistic dual-pyrazol sites, achieving high efficiency in the separation and recovery of transition metals from wastewater.
Background:
1. Industrial wastewater containing heavy metals poses significant environmental risks. Previous researchers have explored various separation techniques, including adsorption, precipitation, and ion exchange, achieving some success. However, these methods often suffer from low selectivity or insufficient adsorption capacity.
2. The authors proposed an innovative MOF design with dual-pyrazol sites oriented parallel to the 1D channels, enhancing both adsorption capacity and selectivity, and obtained promising results.
Research Content:
1. Synthesis:
The authors synthesized MOF-303 using a solvothermal method with aluminum chloride hexahydrate and 3,5-pyrazoledicarboxylic acid as precursors.
2. Characterizations:
1) BET specific surface area was determined to be 910.9 m²/g.
2) SEM tests show the particle size of MOF-303 to be 50–200 nm.
3) FT-IR and XPS analyses confirmed the presence of pyrazol units and their interaction with metal ions.
3. Application:
MOF-303 was tested for the separation of Cu²⁺, Ni²⁺, and Co²⁺ from aqueous solutions. It exhibited a maximum adsorption capacity of 330 mg/g for Cu²⁺ and high separation selectivity (6076 for Cu²⁺/Ni²⁺ and 2662 for Cu²⁺/Co²⁺).
4. Mechanism:
XPS and FT-IR analyses indicated that Cu²⁺ binds strongly to the dual-pyrazol sites. DFT calculations revealed a binding energy of -1429.6 kJ/mol for Cu²⁺, confirming the synergistic effect of the dual-pyrazol sites.
Outlook:
This research highlights the potential of MOF-303 as an efficient adsorbent for metal ion separation and recovery. The design strategy of dual-pyrazol sites offers new insights for developing high-performance MOFs for environmental applications.
Synergistic Dual-Pyrazol Sites of Metal-Organic Framework for Efficient Separation and Recovery of Transition Metals from Wastewater
Authors: Baosheng Liu, Lei Pei, Xudong Zhao, Xuezhi Zhang, Hongliang Huang
DOI: 10.1016/j.cej.2021.128431
Link: https://www.sciencedirect.com/science/article/pii/S1385894721000309
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