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Robust porous polymers bearing phosphine oxide/chalcogenide ligands for volatile iodine capture
- Source :
- Chemical Engineering Journal. 379:122365
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Porous polymeric materials (PPMs) with phosphine oxide/chalcogenide (P = X) ligands were exploited, for the first time, for efficient capture of iodine from the vapor phase. Using triphenylphosphine oxide/sulfide/selenide (TPPO/S/Se), P = X ligands were introduced onto polyhedral oligomeric silsesquioxane (POSS) skeleton via a facile Friedel-Crafts reaction. They show iodine loading capacities, 1.22 g/g to 1.37 g/g at 90 °C, and 0.76 g/g to 0.85 g/g at 160 °C. Once heated at 160 °C under vacuum, they can still keep a considerable iodine loading capacity, 0.41 g/g and 0.51 g/g for POSS-TPPS and POSS-TPPSe, respectively. After soaking in ethanol, the POSS-TPPS/Se retained iodine more than 50%, the highest ratio reported so far for iodine release from PPMs. Besides, the dynamic column experiments were carried out to test their competitive adsorption performance of iodine from a mixed stream with water vapor (40% Relative humidity), and the results suggest that the elevated temperature (160 °C) can reduce the adverse effect of water adsorption remarkably. Moreover, the spectral evidence and DFT calculations reveal that a strong charge transfer through P = X to iodine originates from the three aromatic rings and the chalcogens. The adsorption energy for POSS-TPPSe complexing iodine can reach up to 66 kJ/mol I2, higher than other PPMs. As the first study of adsorbents with P = X ligands for iodine capture, this work opens a new avenue for the adsorptive capture of radioiodine in vapor at elevated temperatures and provides new insights for the interaction mechanism between P = X ligands and iodine molecules.
- Subjects :
- chemistry.chemical_classification
Phosphine oxide
Sulfide
General Chemical Engineering
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Iodine
01 natural sciences
Industrial and Manufacturing Engineering
Silsesquioxane
0104 chemical sciences
Chalcogen
chemistry.chemical_compound
Adsorption
chemistry
Selenide
Environmental Chemistry
0210 nano-technology
Triphenylphosphine oxide
Subjects
Details
- ISSN :
- 13858947
- Volume :
- 379
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Journal
- Accession number :
- edsair.doi...........fc6551489382e94e525d086a33dd14a6