▎ 摘　　要

A glassy carbon electrode modified with beta-cyclodextrin/graphene/1,10-diaminodecane (beta-CD-G-DAD) composite was used to detect Di(2-ethyl hexyl) phthalate (DEHP) by electrochemical method. The composite electrode was fabricated by self-assembly method: DAD was grafted to the surface of a glassy carbon electrode (GCE), and graphene oxide (GO) sheets were absorbed on the amine-terminated DAD (GO/DAD), then beta-CD could be bound with GO through hydrogen bond (beta-CD/GO/DAD), finally beta-CD/GO/DAD was electrochemically reduced to beta-CD/G/DAD. The DEHP entered into cyclodextrin cavity to form the guest-host complex proven by UV-vis spectra, and the characteristic of beta-CD/GO composite was shown by FT-IR spectra. The composite electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The charge resistance value increased linearly with concentration of DEHP in the range of 0.2-1.2 mu M, and the detection limit was 0.01 mu M (3 sigma method). The composite electrode showed good selectivity and stability. (C) 2015 Elsevier B.V. All rights reserved.