Preparation of Graphene/Gold Nanoparticle Composite Film Modified Electrode and Its Application for Determination of Bisphenol A†

doi:10.7503/cjcu20150137

Abstract

Abstract:

A graphene-Au nanocomposite film(ERGO-Au) modified electrodewas prepared using coelectrodeposition technique. The morphology and electrochemical properties of this hybrid membrane were characte-rized by means of transmission electron microscopy(TEM) and cyclic voltammetry(CV), respectively. The electrocatalytic activity of ERGO-Au nanocomposite for the electrooxidation of bisphenol A(BPA) was also investigated. The cyclic voltammetry of bisphenol A on the modified electrode exhibits a well defined irreversible anodic peak. Under the optimum conditions, the oxidation peak current was proportional to bisphenol A concentration in the range from 3.0×10^-8 mol/L to 1.30×10^-5 mol/L. The limit of detection(LOD) is 1.0×10^-8 mol/L(S/N=3). The proposed method was applied for detection of bisphenol A in tap water and plastic products. The described sensor was used for the determination of BPA in tap water and plastic products with good recovery, ranging from 96.4% to 103.5%.

Key words: Gold nanoparticles, Graphene, Bisphenol A, Modified electrode

CLC Number:

O657.1

TrendMD:

FANG Yan, MA Linlin, SHAN Duoliang, LU Xiaoquan. Preparation of Graphene/Gold Nanoparticle Composite Film Modified Electrode and Its Application for Determination of Bisphenol A^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1491.

Figures/Tables 11

Scheme 1 Preparation of the ERGO-Au/GCE

Fig.1 TEM image of ERGO-Au composite film

Fig.2 Cyclic voltammetry(CV) curves of the ERGO/GCE(a) and ERGO-Au/GCE(b) in 0.5 mol/L H2SO4 solution

Fig.3 CV curves of the bare GCE(a), ERGO/GCE(b) and ERGO-Au/GCE (c) in 0.1 mol/L KCl solution containing 1.0 mmol/L [Fe(CN)6]3-/4-

Fig.4 CV curves of bare GCE(a), ERGO/GCE(b) and ERGO-Au/GCE(c) in 0.1 mol/L PBS containing 5.0×10-5 mol/L BPA

Fig.5 Effect of the polymerization cycles(n) on the oxidation peak currents of 3.0×10-5 mol/L BPA

Fig.6 CV curves of ERGO-Au/GCE in PBS solutions(0.1 mol/L) with different pH values(4.0—8.0) containing 5.0×10-4 mol/L BPA(A), influences of pH on the oxidation peak currents(B) and the oxidation peak potentials of BPA(C)

Fig.7 CV curves for the 1.0×10-5 mol/L BPA in PBS(pH=6.0) on the ERGO-Au/GCE with different scan rates(A) and plot of peak current density vs. scan rate for BPA(B)Scan rate/(mV·s-1): a. 20; b. 60; c. 100; d. 140; e. 180; f. 220; g. 260; h. 300.

Fig.8 Effects of accumulation potential(A) and accumulation time(B) on the oxidation peak currents of 5.0×10-5 mol/L BPA

Fig.9 DPV curves of BPA on the ERGO-Au/GCE in 0.1 mol/L PBS(pH=6.0) containing different concentrations of BPA(A) and plots of the peak current vs. the concentration of BPA(B)c/(mol·L-1): a. 0; b. 3.00×10-8; c. 1.00×10-7; d. 5.99×10-7; e. 2.09×10-6; f. 3.24×10-6; g. 5.02×10-6; h. 7.12×10-6; i. 9.00×10-6; j. 1.10×10-5; k. 1.30×10-5.

Table 1 Determination of BPA in practical samples*

Sample	Measured/(mol·L^-1)	Added/(mol·L^-1)	Found/(mol·L^-1)	RSD(%)	Recovery(%)
Tap water	-	5.00×10^-6	4.82×10^-6	3.3	96.4
Baby’s nipple	-	5.00×10^-6	4.93×10^-6	3.5	98.6
PP cup	-	5.00×10^-6	5.18×10^-6	4.1	103.5

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