Colorimetric magnetic microspheres as chemosensor for Cu2+ prepared from adamantane-modified rhodamine and β-cyclodextrin-modified Fe3O4@SiO2 via host–guest interaction

Abstract

Adamantane-modified salicylrhodamine B and β-cyclodextrin-modified Fe3O4@SiO2 were assemblied by host–guest interactions which induced novel inclusion complex magnetic nanoparticles (SFIC MNPs) colorimetric sensitive for Cu2+ being prepared. The MNPs exhibit a clear color change from colorless to pink selectively and sensitively with the addition of Cu2+ in the experiments of UV–visible spectra, and the detection limit measures up to 5.99×10−6M in solutions of CH3CN–H2O =1:10. The SFIC magnetic nanoparticles are superparamagnetic according to magnetic measurements and can be separated and collected easily with a commercial magnet in nine seconds. In addition, the microspheres have also showed good ability of separating for other ions from aqueous solutions due to a large number of hydroxyl groups on the surface.