Simultaneous and selective electrochemical determination of dihydroxybenzene isomers at a reduced graphene oxide and copper nanoparticles composite modified glassy carbon electrode

Abstract

Herein, we have demonstrated the simultaneous and selective electrochemical determination of dihydroxybenzene isomers at a reduced graphene oxide (RGO) and copper nanoparticles (Cu-NPs) composite modified electrode. The RGO/Cu-NPs composite was prepared by a single-step electrochemical reduction method. The synthesized RGO/Cu-NPs composite was characterized using scanning electron microscopy and elemental analysis. Linear sweep voltammetry was employed for the simultaneous determination of hydroquinone (HQ), catechol (CC) and resorcinol (RC). A well defined and more enhanced oxidation peak response is observed for HQ, CC and RC at the RGO/Cu-NPs composite electrode compared to other modified electrodes, which indicates fast electron transfer from dihydroxybenzene isomers at the RGO/Cu-NPs composite electrode. The composite modified electrode shows high electrocatalytic activity towards the oxidation of HQ, CC and RC. The electrochemical sensor shows a wide linear response in the concentration range of 3 mM to 350 mM, 3 to 350 mM and 12 mM to 200 mM for HQ, CC and RC respectively with a detection limit of 0.032 mM, 0.025 mM and 0.088 mM (S/N ¼ 3). In addition, the proposed sensor shows good selectivity and stability along with good precision and consistency. The obtained results clearly demonstrate that the RGO/Cu-NPs composite can be an advanced electrode material for the real time sensing of dihydroxybenzene isomers.

Preparation and characterization of a novel hybrid hydrogel composite of chitin stabilized graphite: Application for selective and simultaneous electrochemical detection of dihydroxybenzene isomers in water

“…The obtained slope values of HQ (-55.7 mV/pH), CC (-55.5 mV/pH) and RC (-55.8 mV/pH) are nearly close to the theoretical value (-59.6 mV/pH) of Nernstian equation for equal number of protons and electrons transfer redox electrochemical process [19]. In addition, a maximum anodic peak current response of HQ, CC and RC was appeared at pH 7 than other pH.…”

“…Carbon nanomaterials and its composites have received significant interest in the electroanalytical community due to their higher surface area, wide potential window and extreme stability [13][14][15]. For example, carbon nanotubes, graphene oxide and reduced graphene oxide or their composites have been widely used for the simultaneous determination of HQ, CC and RC [3,10,[16][17][18][19]. Carbon nanomaterials modified electrodes exhibited good electroanalytical performance Ffor a range of analytes, including dihydroxybenzene isomers, yet the synthesis of carbon nanomaterials is quite-time consuming and expensive.…”

A novel Laccase Biosensor based on Laccase immobilized Graphene-Cellulose Microfiber Composite modified Screen-Printed Carbon Electrode for Sensitive Determination of Catechol

“…Moreover, the phenolic compounds are highly toxic organics, has been widely used in different industrial products and can easily accumulate in the environment and eco system23. Among different phenolic compounds, catechol (CC) is an ortho isomer of benzenediols, has classified as a periodic toxic pollutant by the US Environmental Protection Agency and the European Union due to its poor biodegradability and high toxicity on human health and eco system45. Therefore, a simple and real time detection of trace levels of CC in environmental samples is of great importance.…”

Electrochemical Investigations of Biomolecules Using Carbon Nanotube and Graphene Based Modified Electrodes

“…Determination of glucose in the blood assumes importance in clinical diagnostics of diabetes mellitus. Various approaches have been reported to anchor metal nanoparticles on graphene based materials to enhance the electrochemical activity towards biomolecules sensing [30][31][32]. For example, Seetharamappa and coworkers fabricated a material, Bi nanoparticles embedded rGO for the sensitive determination of an anticancer drug, gemcitabine [30].…”

“…Improved electrochemical response was noticed upon the incorporation of metallic Bi nanoparticles, as Bi nanoparticles are known for their electrocatalytic activities [30]. Similarly, Chen et al have developed Au nanoparticles embedded graphene, prepared through electrochemical approach, and was used for simultaneous and selective electrochemical determination of dihydroxybenzene isomers [31].…”