Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 38, Pages 32446-32451Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12396
Keywords
metal-organic frameworks; amidoxime; uranyl; adsorption; seawater
Funding
- National Natural Science Foundation of China [21422704, 21601131]
- Science Foundation of Jiangsu Province [BK20140007, BK20150313]
- State Key Laboratory of Pollution Control
- Resource Reuse Foundation [PCRRF16003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection
- Young Thousand Talented Program in China
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Enrichment of uranyl from seawater is crucial for the sustainable development of nuclear energy, but current uranium extraction technology suffers from multiple drawbacks of low sorption efficiency, slow uptake kinetics, or poor extraction selectivity. Herein, we prepared the first example of amidoxime appended metal organic framework UiO-66-AO by a postsynthetic modification method for rapid and efficient extraction of uranium from seawater. UiO-66-AO can remove 94.8% of uranyl ion from Bohai seawater within 120 min and 99% of uranyl ion from Bohai seawater containing extra 500 ppb uranium within 10 min. The uranyl sorption capacity in a real seawater sample was determined to be 2.68 mg/g. In addition, the recyclability of the UiO-66-AO framework was demonstrated for at least three adsorption/desorption cycles. The origin for the superior sorption capability was further probed by extended X-ray absorption fine structure (EXAFS) analysis on the uranium-sorbed sample, suggesting multiple amidoxime ligands are able to chelate uranyl(VI) ions, forming a hexagonal bipyramid coordination geometry.
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