A green luminescent composite material containing rare earth terbium, its preparation method and application

Abstract

The invention discloses a terbium-containing green luminous composite material, a preparation method and application. The composite material is CHAB / Tb, wherein CHAB is phthalic anhydride modified chitosan, Tb is terbium ions, and the form is hydrogel. The preparation method comprises the steps that the chitosan is added into an acetic acid solution, and dissolution is conducted to obtain sol; phthalic anhydride is dissolved in pyridine, under stirring, the solving liquid is dropwise added into a chitosan solution for reacting, the pH is adjusted to 7, a saturated sodium chloride solution is added for reacting, solid products are filtered and collected, and the phthalic anhydride modified chitosan CHAB is obtained through dialysis; the CHAB is dissolved, a TbCl3 solution is dripped, hydrogel beads are washed, and the final product is obtained. The composite material can serve as a recognition material of metal ions and particularly recognizes Fe<3+> ions.

Description

technical field [0001] The invention belongs to a hydrogel composite luminescent material, in particular to a composite luminescent material containing a rare earth terbium complex and a preparation method thereof. Background technique [0002] Chitosan is a polysaccharide biomacromolecule obtained by deacetylation of chitin. Chitosan has good biocompatibility and biodegradability (CN 101766188B; CN 105273105A) has received great attention in the fields of food industry, agriculture, biomedical materials and tissue engineering materials (US 9414967; US 9480774; US9598504; US9522114). Rare earth complexes have the characteristics of high color purity, long fluorescence lifetime and rich emission lines. In order to expand the application range of rare earth complexes and improve the stability of the complexes, the rare earth complexes are generally prepared into composite materials, and the matrix used is generally silica, but compared with biological macromolecular matrix, ...

AI Technical Summary

Problems solved by technology

However, the rare earth compound of this kind of material is combined with the matrix through a relatively weak intermolecular force, and its luminescent center is easy to reunite, and increasing the doping concentration of rare earth is prone to fluorescence quenching

Covalently linking rare earth compounds to the biomacromolecular skeleton can avoid the occurrence of fluorescence quenching. At present, there are few research reports on this aspect, and the preparation of new rare earth luminescent composite materials is expected to provide new opportunities for the application of rare earth compounds. way

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