Nitrogen-Doped Graphene-based Enzymatically Modified Electrode for the Detection of Hydroquinone
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Abstract:
Based on the graphite oxide produced by the improved Hummers method, nitrogen-doped graphene nanomaterials were prepared by hydrothermal reduction method using polyaniline as the nitrogen source. The prepared nanomaterials were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Then, the prepared nitrogen-doped graphene was combined with the horseradish peroxidase to prepare an enzymatically modified electrode for the detection of hydroquinone. The catalytic performance of the modified electrode towards hydroquinone was studied by cyclic voltammetry. The results showed that in the presence of H2O2, the enzymatically modified electrode exhibited excellent catalytic activity towards hydroquinone. Under the determined experimental conditions, the linear range of detection, detection limit and sensitivity were 9 × 10-5 ~ 5.075 × 10-3 mol/L, 1 × 10-5 mol/L (S/N = 3) and 84.14 mA/(mol·cm2), respectively, with very good anti-interference ability and selectivity to uric acid, ascorbic acid, Vitamin E, citric acid and glucose. The electrode also exhibited very good reproducibility and had a relative standard deviation (RSD) of 5 measurements as 2.89% . This prepared electrode can also be used for the detection of hydroquinone in water.
