2023 Volume 62 Issue 2 Pages 5-11
The mechanism of anion-exchange selectivity of the layered double hydroxides (LDHs) and the LDHs-dyes hybrid materials with molecular detection ability has been investigated in this paper. In the part of mechanism elucidation of anion-exchange selectivity of LDHs, the structural features of LDHs obtained by synchrotron X-ray diffraction and the chemical states of anion species and hydration water molecules in the interlayers of LDHs obtained by Raman spectroscopy and 17O solid-state NMR have been clarified. Moreover, synchrotron radiation X-ray diffraction in-situ measurement system at SPring-8 was assembled for measuring the crystal structure changes during anion exchange reactions and it was found that the dynamic structure changes of LDHs was successfully measured. In the part of dyes-LDHs hybrid materials with molecular detection ability, it was found that LDHs modified with zinc-porphyrin and amphiphilic molecules can detect pyridine molecules in water at very low concentrations (on the order of nmol/L).
