Recognition and Electrochemical Determination of Environmental Contaminants Nitrophenol by Cyclodextrin Homologous Functionalized Graphene Modified Electrodes

摘要

The determination of Nitrophenol (NP) isomers, one type of serious environmental contaminants, is ofgreat importance for environmental control. Herein, a novel electrochemically modified glassy carbonelectrodes (CDs/CRG/GCE) is developed for determination of NP isomers using differentcyclodextrins (-, - and -CD) in combination with chemically reduced graphene (CRG). Therecognition mechanism of different cyclodextrins (CDs) for NP isomers is systematically studied.Interestingly enough, the cavity size of CDs plays an important role in the recognition of NP isomers.The -CD/CRG/GCE and -CD/CRG/GCE display the best response to p-NP and o-NP, respectively.All three types of CDs modified electrodes show the similar effect on m-NP. Attributed to thesynergistic effect of the specific recognition property of CDs and the excellent electronic property ofCRG, the CDs/CRG/GCE exhibits outstanding supramolecular recognition and sensitiveelectrochemical response to NP isomers compared with that of CRG/GCE. The reductive peak current-7 of p-NP at -CD/CRG/GCE is linearly dependent on the concentration in the range from 1.0 10 to -81.5 10 mol/L with a low detection limit of 3.310 mol/L. The present work offers a new way tobroaden the analytical applications of graphene-based materials for isomer analysis.