NDLI: A Simple but Efficient Voltammetric Sensor for Simultaneous Detection of Tartrazine and Ponceau 4R Based on $TiO_{2}$/Electro-Reduced Graphene Oxide Nanocomposite

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A Simple but Efficient Voltammetric Sensor for Simultaneous Detection of Tartrazine and Ponceau 4R Based on $TiO_{2}$/Electro-Reduced Graphene Oxide Nanocomposite

Content Provider	MDPI
Author	Qin, Zirong Zhang, Jinyan Liu, Ying Wu, Jingtao Li, Guangli Liu, Jun He, Quanguo
Copyright Year	2020
Description	In this work, we report a simple but efficient voltammetric sensor for simultaneous detection of ponceau 4R and tartrazine based on TiO2/electro-reduced graphene oxide nanocomposites (TiO2/ErGO). TiO2/ErGO nanocomposites were prepared by ultrasonically dispersing TiO2 nanoparticles (TiO2 NPs) into graphene oxide (GO) solution followed by a green in-situ electrochemical reduction. TiO2 NPs were uniformly supported on ErGO nanoflakes, which provides a favorable interface for the adsorption and subsequent oxidation of target analytes. TiO2/ErGO showed remarkable electrocatalytic capacity for the oxidation of ponceau 4R and tartrazine, with minimized oxidation overpotentials and boosted adsorptive striping differential pulse voltammetric (AdSDPV) response peak currents. Under the optimal experimental conditions, the anodic peak currents of ponceau 4R and tartrazine increase linearly with the respective natural logarithm of concentrations from 0.01 to 5.0 μM. The detection limits (LOD = 3σ/s) for ponceau 4R and tartrazine are 4.0 and 6.0 nM, respectively. The extraordinary analytical properties of TiO2/ErGO/GCE are primarily attributed to the synergistic enhancement effect from ErGO nanoflakes and TiO2 NPs. Moreover, the proposed TiO2/ErGO/GCE achieves reliable determination of ponceau 4R and tartrazine in orange juice with excellent selectively, reproducibility and stability. Together with simplicity, rapidness, and low cost, the proposed sensor demonstrates great potential for on-site detection of azo colorants.
Starting Page	70
e-ISSN	22279040
DOI	10.3390/chemosensors8030070
Journal	Chemosensors
Issue Number	3
Volume Number	8
Language	English
Publisher	MDPI
Publisher Date	2020-08-19
Access Restriction	Open
Subject Keyword	Chemosensors Analytical Chemistry Ponceau 4r Tartrazine Tio2 Electro-reduced Graphene Oxide Voltammetric Sensor
Content Type	Text
Resource Type	Article

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