Ionic liquid modified covalent organic frameworks for efficient detection and adsorption of ReO4–/TcO4–

An ionic vinylene-linked three-dimensional covalent organic framework for selective and efficient trapping of ReO4− or 99TcO4−

“…11 ). Compared with all existing anion exchange materials 52 , 53 , TFPM-PZ-Cl significantly enhanced acid and alkali resistance. This powerful advantage stems from the impressive stability of the material given by the olefin bond.…”

“…After ReO 4 - adsorbed, a peak at 909 cm −1 (Re–O bond) appeared in the FT-IR spectrum (Supplementary Fig. 38 ) 52 . In addition, from the Raman spectra, the peaks at 956 cm −1 and 330 cm −1 for ReO 4 − (NaReO 4 as reference), indicated the Re was successfully captured by TFPM-PZ-Cl (Supplementary Fig.…”

“…Furthermore, the peak of the N + (−C − N + − C −) increased from 401.21 to 401.71 eV after ReO 4 - adsorbed (Supplementary Figs. 42 and 43 ), which were caused by the electrostatic attraction between the pyrazine group and the ReO 4 − 52 . EDS mapping further visually demonstrated the ion exchange behavior of Cl − and ReO 4 − (Fig.…”

Covalent Organic Frameworks with Ionic Liquid-Moieties (ILCOFs): Structures, Synthesis, and CO2 Conversion

“…Yan et al [ 93 ] prepared a kind of cationic ILCOF, DhaTab-S, via free-radical polymerization between a cationic surfactant, diallyldimethylammonium chloride (DMDAAC), and a vinyl-containing COF, DhaTab-V, which was prepared from Tab and vinyl-modified 2,5-dihydroxyterephthalaldehyde (Da-V). More recently, Liang and Qiu et al [ 94 ] prepared a kind of ILCOF, Tp-BDOH-AB, through Williamson ether reactions between Tp-BDOH and AB, and Tp-BDOH COF was synthesized via the Schiff reaction of Tp and 3,3′-dihydroxybenzidine (BDOH). This ILCOF was studied for the efficient detection and adsorption of ReO 4 – /TcO 4 – .…”

Single-Crystal-Structure Directed Predesign of Cationic Covalent Organic Polymers for Rapidly Capturing 99TcO4–

“…Combining the functions of ion exchange and solid-phase extraction, cationic materials with oxyanion-trapping effects are becoming increasingly active in 99 TcO 4 – separation. − Among all the available functional materials, covalent organic polymers (COPs), − originated from connecting organic units through covalent bonds, are famous for excellent stability under strict conditions like high acid conditions and strong radiation. In addition, COPs are much more designable either through pre- or post-treated approach with impressive grafting yield, leading to good affinity toward target ions. − Although several functional COPs for 99 TcO 4 – /ReO 4 – separation have been reported, there is still a profound need in designing new COPs with great potential in the treatment of practical technetium-containing water. − …”