Wydział Chemii

Mateusz Janeta

Wojciech Bury

Sławomir Szafert

2018

ACS Applied Materials and Interfaces

10

19964-19973

10.1021/acsami.8b03023

Naukowa

Angielski

Artykuł

The efficient capture and storage of radioactive iodine (¹²⁹I or ¹³¹I), which can be formed during nuclear energy generation or nuclear waste storage, is of paramount importance.  Herein, we present highly efficient aerogels for reversible iodine capture, namely, porous silsesquioxane-imine frameworks (PSIFs), constructed by condensation of octa(3-aminopropyl)silsesquioxane cage compd. and selected multitopic aldehydes.  The resulting PSIFs are permanently porous (Brunauer-Emmet-Teller surface areas up to 574 m²/g), thermally stable, and present a combination of micro-, meso-, and macropores in their structures.  The presence of a large no. of imine functional groups in combination with silsesquioxane cores results in extremely high I₂ affinity with uptake capacities up to 485 wt %, which is the highest reported to date.  Porous properties can be controlled by the strut length and rigidity of linkers.  In addn., PSIF-1a could be recycled at least four times while maintaining 94% I₂ uptake capacity.  Kinetic studies of I₂ desorption show two strong binding sites with apparent activation energies of 77.0 and 89.0 kJ/mol.  These energies are considerably higher than the enthalpy of sublimation of bulk I₂.

microporous polymer, iodine capture, gas storage, porosity, aerogel, imine, silsesquioxane

http://doi.org/10.1021/acsami.8b03023

https://www.acs.org/content/acs/en.html