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Ultrastable Thorium Metal-Organic Frameworks for Efficient Iodine Adsorption
Zi-Jian Li1,2, Zenghui Yue1,2, Yu Ju1,2,3
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 2019 Jia Luo Road, Shanghai 201800, China.
Inorganic Chemistry
|March 14, 2020
Summary
Two new thorium-based metal-organic frameworks (MOFs) show remarkable stability and high affinity for iodine. Th-SINAP-8 effectively removes iodine from solutions and adsorbs iodine vapor, indicating potential for iodine capture applications.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) offer tunable properties for various applications.
- Thorium-based MOFs are less explored but possess unique characteristics.
- Efficient iodine capture remains a significant challenge in environmental and industrial settings.
Purpose of the Study:
- To synthesize and characterize novel thorium-based MOFs.
- To investigate the stability and iodine adsorption capabilities of these MOFs.
- To explore the potential of these materials for iodine capture and removal.
Main Methods:
- Solvothermal synthesis of thorium-based MOFs (Th-SINAP-7 and Th-SINAP-8).
- Characterization using FTIR, PXRD, SEM-EDS, UV-vis, XPS, and Raman spectroscopy.
- Evaluation of chemical stability (pH 1-12), thermal stability (up to 520 °C), and radioresistance.
- Assessment of iodine (I2) molecule adsorption from solution and vapor phases.
Main Results:
- Successful synthesis of two novel, stable thorium-based MOFs: Th-SINAP-7 and Th-SINAP-8.
- Demonstrated exceptional chemical (pH 1-12), thermal (520 °C), and ionizing radioresistance.
- High affinity for I2 molecules due to charge transfer interactions between MOF π-electrons and guest iodine.
- Th-SINAP-8 achieved >99% I2 removal from cyclohexane and an iodine vapor adsorption capacity of 473 mg/g.
Conclusions:
- Th-SINAP-7 and Th-SINAP-8 are robust thorium-based MOFs with excellent stability.
- These MOFs exhibit significant potential for efficient iodine capture from both liquid and gas phases.
- The charge transfer mechanism highlights the design principles for developing advanced iodine adsorbents.
