Tetraphenylmethane Covalent Organic Frameworks for Gaseous Iodine Adsorption
For obtaining efficient and stable materials for gaseous iodine adsorption,DpTp-COF and AnTp-COF were synthesized under hydrothermal conditions with tetraphenylmethane as aldehyde monomer,reacting with 4,4'-diaminoterphenyl and 2,6-diaminoanthracene,respectively.The synthesized COFs maintained structural sta-bility at 400 ℃,and the specific surface areas of DpTp-COF and AnTp-COF were 955 m2/g and 786 m2/g,re-spectively.Under the experimental conditions,the adsorption capacities of DpTp-COF and AnTp-COF for gaseous iodine were 4.75 g/g and 4.95 g/g,respectively,and the adsorption process conformed to the quasi-second-order kinetic equation.Desorption of iodine was achieved from iodine-loaded COFs by using ethanol.The adsorption ca-pacity of DpTp-COF and AnTp-COF decreased by 19.36％and 24.85％,respectively,after four adsorption-de-sorption cycles.Raman and XPS spectra characterization of DpTp-COF and AnTp-COF showed that iodine mainly existed in the form of I3-and I5-onto the two materials,indicating that charge transfer occurred between the COFs and iodine molecules.
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