β-Cyclodextrin functionalized graphene material: A novel electrochemical sensor for simultaneous determination of 2-chlorophenol and 3-chlorophenol

In the present paper, a β-cyclodextrin (β-CD) functionalized graphene modified carbon paste electrode (CD/GRs/CPE) was prepared and characterized by atomic force microscopy (AFM), Fourier transform infrared (FT-IR) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of 2-chlorophenol (2-CP) and 3-chlorophenol (3-CP) on different electrodes were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results demonstrated that the CD/GRs/CPE exhibited remarkable enhancement effects towards these two chlorophenols, especially for 3-CP. Importantly, their oxidation peaks could be well separated by CVs and DPVs. Under the optimized conditions, the oxidation peak currents displayed a good linear relationship to concentration in the ranges from 0.5 to 40 μM for 2-CP and 0.4 to 77 μM for 3-CP, with detection limits of 0.2 and 0.09 μM, respectively. As a practical application, the proposed sensor was applied to quantitatively determine 2-CP and 3-CP in water samples with satisfying results.