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Correlation between coordination environments and sorption selectivity to 99TcO4- in two-dimensional metal-organic
Daopeng Sheng1, Fuwan Zhai1, Baoyu Li1
1State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou, 215123, China. nnshen@suda.edu.cn.
Chemical Communications (Cambridge, England)
|September 18, 2025
Summary
Researchers explored how metal-organic frameworks (MOFs) selectively remove pertechnetate (TcO4-) from water. The MOF SCU-105 showed excellent performance for treating contaminated water.
Area of Science:
- Environmental Chemistry
- Materials Science
- Inorganic Chemistry
Background:
- Pertechnetate (TcO4-) is a challenging contaminant in nuclear waste.
- Understanding the selectivity of materials for TcO4- removal is crucial for remediation.
- The structural determinants governing TcO4- selectivity in metal-organic frameworks (MOFs) are not well understood.
Purpose of the Study:
- To systematically investigate the relationship between the structure of metal-organic frameworks (MOFs) and their selectivity for pertechnetate (TcO4-).
- To identify key framework properties that enhance TcO4- adsorption.
- To evaluate the performance of MOFs in simulated TcO4- contaminated water.
Main Methods:
- Synthesis and characterization of two isostructural metal-organic frameworks (MOFs).
- Systematic variation of framework and properties to elucidate structure-selectivity relationships.
- Adsorption experiments to assess TcO4- uptake and selectivity in aqueous solutions.
Main Results:
- Identified specific structural features correlating with high TcO4- selectivity.
- Demonstrated that MOF SCU-105 exhibits exceptional selectivity for TcO4- over competing anions.
- SCU-105 showed superior performance in removing TcO4- from simulated contaminated water compared to its isostructure.
Conclusions:
- The study elucidates critical structure-property-selectivity relationships for TcO4- removal using MOFs.
- The highly selective MOF SCU-105 presents a promising material for effective pertechnetate remediation.
- Findings provide a foundation for designing advanced MOFs for targeted contaminant removal.
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