Simultaneous Determination of Nitrophenol Isomers Based on β-Cyclodextrin Functionalized Reduced Graphene Oxide

beta-CD modified reduced graphene oxide (RGO) sheets have been prepared and characterized by TEM, AFM, IR, EIS and CVs. In comparison with bare glass carbon electrode (GCE) and RGO modified GCE, CD-RGO/GCE showed much higher peak currents to the reduction of nitrophenol isomers (NPs), attributed to the larger specific surface area of RGO and high quantities of hostguest recognition sites. Three pairs of redox peaks are observed on the CVs of CD-RGO for p-NP (0.3 V), o-NP (-0.2 V) and m-NP (0.05 V), separating well with each other. Under the optimized condition, the anodic peak currents were linear over ranges around 110 mg?dm-3 for p-NP, 19 mg?dm-3 for o-NP and 16 mg?dm-3 for m-NP, with the detection limits of 0.05 mg?dm-3, 0.02 mg?dm-3 and 0.1 mg?dm-3, respectively. Thus, the CD-RGO is expected to be a promising sensor material for detecting trace NPs in waste water.