Preparation a Composite of Graphene/Diisocyanate/β-Cyclodextrin and Its Application to Determination of Cu(Ⅱ)

A novel graphene/diisocyanate/β-cyclodextrin composite was prepared with graphene oxide, isophorone diisocyanate and β-cyclodextrin as raw materials. The composite was characterized by FT-IR and SEM. It was found that characteristic fluorescence signals were obtained upon its reaction with Cu(Ⅱ). Under optimum conditions, a linear relationship was found between values of fluorescence intensity and concentration of Cu(Ⅱ) in the range of 1.00-6.00 mmol·L-1, with detection limit (3S/N) of 0.007 5 mmol·L-1. The proposed method was applied to the determination of Cu(Ⅱ) in water, giving values of recovery in the range of 96.3%-100% and RSD′s (n=6) less than 4%.