A hybrid composed of MoS2, reduced graphene oxide and gold nanoparticles for voltammetric determination of hydroquinone,
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ORIGINAL PAPER
A hybrid composed of MoS2, reduced graphene oxide and gold nanoparticles for voltammetric determination of hydroquinone, catechol, and resorcinol Guangran Ma 1,2 & Hui Xu 2 & Meijuan Wu 2 & Lin Wang 2 & Jianghua Wu 2 & Fugang Xu 2 Received: 23 April 2019 / Accepted: 16 August 2019 # Springer-Verlag GmbH Austria, part of Springer Nature 2019
Abstract A ternary hybrid composed of molybdenum disulfide (MoS2), reduced graphene oxide (rGO) and gold nanoparticles (AuNPs@MoS2-rGO) was prepared and used for voltammetric detection of hydroquinone (HQ), catechol (CC) or resorcinol (RC). The composition and structure of the hybrid were characterized in detail. The electrochemical behaviors of a glassy carbon electrode (GCE) modified with the hybrid towards the oxidation of HQ, CC, and RC were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results revealed 3D MoS2 is active for the catalytic oxidation of these isomers. Additional integration with rGO and AuNPs further improves catalysis due to their synergistic interaction. The enhanced catalysis leads to oxidation of HQ, CC and RC at 0.074 V, 0.178 V, and 0.527 V (vs. Ag/AgCl; by CV) with reduced overpotential (20-100 mV) and 8-fold or 3-fold increased peak current compared to those obtained on MoS2/GCE, or MoS2-rGO/GCE, respectively. Selective detection of one isomer in the presence of the other two was realized by DPV. The linear ranges are 0.1–950 μM, 3–560 μM, and 40–960 μM for HQ, CC, and RC, and the detection limits are 0.04 μM, 0.95 μM, and 14.6 μM, respectively. The sensor also shows good selectivity and displays satisfactory recovery for real sample analysis. Keywords Dihydroxybenzene isomer . Molybdenum disulfide . Graphene . Electrochemical sensor . Gold nanoparticle . Environment analysis
Introduction Accurate detection of hydroquinone (HQ), catechol (CC), and re sorc inol (RC) is o f gre at imp ortan ce a s the se dihydroxybenzene isomers are ubiquitous in nature but detrimental to the environment and human health due to their low degradability and high toxic property [1–3]. Electrochemical sensor is a promising way for the detection of these isomers. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-019-3771-4) contains supplementary material, which is available to authorized users. * Guangran Ma [email protected] * Fugang Xu [email protected] 1
Analytical and Testing Center of Jiangxi Normal University, Nanchang 330022, China
2
College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
However, the similar structure and close redox potential of them make it difficult to achieve their selective detection by conventional electrodes, especially for HQ and CC. A promising alternative is to coat traditional electrode with catalytic active nanomaterials, such as carbon allotropy [4, 5], conducting polymers [6], and metal or metal oxide nanoparticles [7, 8]. Therefore, new functional material is still desirable for se
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