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Sensors 2018, 18(6), 1911; https://doi.org/10.3390/s18061911

Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes

1,2,3,†
,
1,3,†
,
2,3
,
1,3
,
2,3,* , 2,3
and
1,*
1
School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China
2
Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
3
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China
These authors contributed equally.
*
Authors to whom correspondence should be addressed.
Received: 23 April 2018 / Revised: 9 June 2018 / Accepted: 11 June 2018 / Published: 12 June 2018
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [3670 KB, uploaded 14 June 2018]   |  

Abstract

TiO2-reduced graphene oxide composite-modified glassy carbon electrodes (TiO2–ErGO–GCE) for the sensitive detection of tartrazine were prepared by drop casting followed by electrochemical reduction. The as-prepared material was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Cyclic voltammetry and second-order derivative linear scan voltammetry were performed to analyze the electrochemical sensing of tartrazine on different electrodes. The determination conditions (including pH, accumulation potential, and accumulation time) were optimized systematically. The results showed that the TiO2–ErGO composites increased the electrochemical active area of the electrode and enhanced the electrochemical responses to tartrazine significantly. Under the optimum detection conditions, the peak current was found to be linear for tartrazine concentrations in the range of 2.0 × 10−8–2.0 × 10−5 mol/L, with a lower detection limit of 8.0 × 10−9 mol/L (S/N = 3). Finally, the proposed TiO2–ErGO–GCEs were successfully applied for the detection of trace tartrazine in carbonated beverage samples. View Full-Text
Keywords: titanium dioxide; reduced graphene oxide; modified electrode; tartrazine; electrocatalysis titanium dioxide; reduced graphene oxide; modified electrode; tartrazine; electrocatalysis
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He, Q.; Liu, J.; Liu, X.; Li, G.; Deng, P.; Liang, J.; Chen, D. Sensitive and Selective Detection of Tartrazine Based on TiO2-Electrochemically Reduced Graphene Oxide Composite-Modified Electrodes. Sensors 2018, 18, 1911.

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