Glassy Carbon Electrode Modified with Gold nanoparticles/thiol-β-cyclodextrin-graphene for the Determination of Nonylphenol

The gold nanoparticles (AuNPs) was firstly polymerized on the surface of glassy carbon electrode (GCE) using the chronoamperometry, then the gold nanoparticles/thiol-beta-cyclodextrin-graphene/GCE (AuNPs/SH-beta-CD-GR/GCE) was directly synthesized with the complex of thiol-beta-cyclodextrin (SH-beta-CD) and graphene oxide (GO) by cyclic voltammetry (CV). The AuNPs/SH-beta-CD-GR/GCE was characterized by field emission scanning electron microscopy (FESEM), which indicated that the as-polymerized Au nanoparticles were successfully dispersed on the surface of GCE and combined with SH-beta-CD and GR. Simultaneously, the electrochemical behavior of nonylphenol (NP) was investigated by CV and differential pulse voltammetry (DPV). The oxidation current of NP on AuNPs/SH-beta-CDGR/GCE is much higher than that of GCE, AuNPs/GCE and AuNPs/GR/GCE, and the oxidation potential is shifted negatively, it indicates that the NP has been apparently catalyzed by AuNPs/SH-beta-CD-GR/GCE. The conditions of preparation and test were optimized, on the condition of optimization, the oxidation current is linearly proportional to the concentration of NP over the range of 0.05 similar to 50 mu mol L-1 (R = 0.9901), the detection limit is 0.017 mu molL(-1) ((P < 0.05) S/N = 3). The recoveries of samples are from 96.11% to 105.9%. The result is satisfactory when it is used to analyze the real samples.