Chitosan photonic crystal microsphere for detecting hexavalent chromium ions and preparation method thereof

The invention relates to the technical field of detection methods, in particular to a chitosan photonic crystal microsphere for detecting hexavalent chromium ions and a preparation method of the chitosan photonic crystal microsphere. The invention provides a preparation method of chitosan photonic crystal microspheres, which comprises the following steps: emulsifying, drying and calcining silicon dioxide nanoparticles to obtain the photonic crystal microspheres, soaking the photonic crystal microspheres in a chitosan hydrogel solution, adding glutaraldehyde after full soaking, and drying to obtain the chitosan photonic crystal microspheres. And carrying out chemical cross-linking curing on the chitosan and glutaraldehyde in gaps in the silicon dioxide photonic crystal microspheres, and stripping to obtain the chitosan photonic crystal microspheres filled with the chitosan. Chitosan is poured into the photonic crystal microsphere, the microsphere can provide a larger specific surface area, and the photonic cry