• Title/Summary/Keyword: Calixarenes

Search Result 15, Processing Time 0.019 seconds

Cesium separation from radioactive waste by extraction and adsorption based on crown ethers and calixarenes

  • Wang, Jianlong;Zhuang, Shuting
    • Nuclear Engineering and Technology
    • /
    • v.52 no.2
    • /
    • pp.328-336
    • /
    • 2020

  • Cesium is a major product of uranium fission, which is the most commonly existed radionuclide in radioactive wastes. Various technologies have been applied to separate radioactive cesium from radioactive wastes, such as chemical precipitation, solvent extraction, membrane separation and adsorption. Crown ethers and calixarenes derivatives can selectively coordinate with cesium ions by ion-dipole interaction or cation-π interaction, which are promising extractants for cesium ions due to their promising coordinating structure. This review systematically summarized and analyzed the recent advances in the crown ethers and calixarenes derivatives for cesium separation, especially focusing on the adsorbents based on extractants for cesium removal from aqueous solution, such as the grafting coordinating groups (e.g. crown ether and calixarenes) and coordinating polymers (e.g. MOFs) due to their unique coordination ability and selectivity for cesium ions. These adsorbents combined the advantages of extraction and adsorption methods and showed high adsorption capacity for cesium ions, which are promising for cesium separation The key restraints for cesium separation, as well as the newest progress of the adsorbents for cesium separation were also discussed. Finally, some concluding remarks and suggestions for future researches were proposed.

  • https://doi.org/10.1016/j.net.2019.08.001 인용 PDF KSCI

Synthesis and Characterization of New Calixarenes from Bisphenol A

  • An, Gyo Han;Kim, Seong Gon;Yu, Jong Seon
    • Bulletin of the Korean Chemical Society
    • /
    • v.21 no.8
    • /
    • pp.813-816
    • /
    • 2000

  • The synthesis of bisphenol A-derived calixarenes has been studied by changing the protecting group of the phe-nol moiety and reaction conditions. Depending on the protecting groups,the corresponding calix[6,7,8]arenes are obtained in different rat ios. For example, whcn mono-p-tert-butyldimethylsilyl-protected bisphenol A is treated with paraformaldehyde and a catalytic amount ofaqueous KOH in refluxing p-xylene with a Dean-Stark water collector for 36 h, the corresponding calix[8]arene, calix[7]arene, and calix[6]arene are producedand separated in the ratio of about 3 : 2 : l and with overall 63% yield. The calixarenes are characterized by NMR spectroscopy and mass analysis. The X-raycrystal structure of the calix[8]arene shows a pleated loop confor-mation, stabilized by intramoIecular hydrogen bonding between the inner phenolic hydroxy groups.

  • https://doi.org/10.5012/bkcs.2000.21.8.813 인용 PDF

N-Anthracenylmethyl Calix[4]azacrowns as New Fluorescent Ionophores

  • Yang, Seung-H.;Shon, Ok-J.;Park, Ki-M.;Lee, Shim-S.;Park, Ho-J.;Kim, Moon-J.;Lee, Joung-H.;Kim, Jong-S.
    • Bulletin of the Korean Chemical Society
    • /
    • v.23 no.11
    • /
    • pp.1585-1589
    • /
    • 2002

  • Two novel calixarene-based fluoroionophores were synthesized. Their conformations were confirmed to 1,3-alternate by X-ray crystal structures. From CHEF by blocking the PET mechanism in fluorescence spectra, we observed $In^{3+}$ and $Pb^{2+}$ selectivity over other metal ions. For $In^{3+}$ion, calix[4]-bis-azacrown-5 showed about 20 times more sensitive than calix[4]-mono-azacrown-5 because the source of the binding selectivity comes from the calixarene framework and azacrown ligand by controlling the fluorescence and PET mechanisms as-sociated with the amine moiety.

  • https://doi.org/10.5012/bkcs.2002.23.11.1585 인용 PDF KSCI