Abstract
A simple strategy for determination of hydroxylamine based on Fe3O4 nanoparticles functionnalized by [2-(4-((3-(trimethoxysilyl)propylthio)methyl)1-H1,2,3-triazol-1-yl)aceticacid] (FNPs) and graphene oxide (GO) modified screen-printed electrode (SPE), denoted as (Fe3O4 FNPs/GO/SPE), is reported. The electrochemical behavior of hydroxylamine was investigated at Fe3O4FNPs/GO/SPE by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CHA) techniques in phosphate buffer solution (pH 7.0). Fe3O4 FNPs/GO/SPE as a novel electrochemical sensor exhibited catalytic activity toward the oxidation of hydroxylamine. The potential of hydroxylamine oxidation was shifted to more negative potentials, and its oxidation peak current increased on the modified electrode, also indicating that under these conditions, the electrochemical process is irreversible. The electrocatalytic current of hydroxylamine showed a good relationship in the concentration range of 0.05–700.0 μM, with a detection limit of 10.0 nM. The proposed electrode was applied for the determination of hydroxylamine in water samples, too.
Highlights
Result and discussionElectrochemical profile of hydroxylamine on Fe3O4 FNPs/Graphene oxide (GO)/screen-printed electrode (SPE) Since the electrochemical behaviour of hydroxylamine is pH-dependent, the optimizing pH of the solution is necessary for obtaining the best results
Hydroxylamine is one of the important compounds in the chemical industry
As it can be noticed, the maximum oxidation of hydroxylamine occurs at 860 mV in the case of Fe3O4 FNPs/Graphene oxide (GO)/screen-printed electrode (SPE), which is around 165 mV more negative than observed in the case of unmodified SPE
Summary
Electrochemical profile of hydroxylamine on Fe3O4 FNPs/GO/SPE Since the electrochemical behaviour of hydroxylamine is pH-dependent, the optimizing pH of the solution is necessary for obtaining the best results. As it can be noticed, the maximum oxidation of hydroxylamine occurs at 860 mV in the case of Fe3O4 FNPs/GO/SPE, which is around 165 mV more negative than observed in the case of unmodified SPE
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