Efficient capture of radioiodine from aqueous solutions
is of importance
for sustainable development of nuclear energy and protection of the
environment. However, current adsorbents under exploration suffer
from limited adsorption capacity and powder form that are unfavorable
for practical applications. Herein, we applied a “multi-functionalization
integration” idea to construct novel electrospun fiber adsorbents
(N-MOF-PAN fibers) containing cationic quaternary ammonium groups,
uncharged amine groups, and porous MOF material (UiO-66-NH2), which in synergy adsorb iodine effectively from both saturated
I2 aqueous solution and I3
– aqueous solution. Iodine species (94.6%) could be removed from saturated
I2 solution within 180 min, and 98.7% of iodine species
were captured from I3
– solution within
240 min. Additionally, the N-MOF-PAN fibers exhibited high iodine
uptake capacities of 3.56 g g–1 from a concentrated
KI/I2 aqueous solution and 3.61 g g–1 from the Langmuir isotherm model, surpassing many reported iodine
adsorbents in the aqueous medium. Characterization and mechanism analysis
indicated that multiple active sites simultaneously attribute to the
high binding affinity toward iodine species through physical adsorption
and chemical adsorption. Furthermore, benefiting from their macroscopic
architecture, N-MOF-PAN fibers were used as the adsorption column
for dynamic iodine capture with a bed volume of 1490 mL, which is
much higher than commercially activated carbons. Overall, this work
provides guidance for the development of novel fiber adsorbents for
related applications.
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