Ionic liquid coated iron nanoparticles are promising peroxidase mimics for optical determination of H2O2
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Ionic liquid coated nanoparticles (IL-NPs) consisting of zero-valent iron are shown to display intrinsic peroxidase-like activity with enhanced potential to catalyze the oxidation of the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide. This results in the formation of a blue green colored product that can be detected with bare eyes and quantified by photometry at 652 nm. The IL-NPs were further doped with bismuth to enhance its catalytic properties. The Bi-doped IL-NPs were characterized by FTIR, X-ray diffraction and scanning electron microscopy. A colorimetric assay was worked out for hydrogen peroxide that is simple, sensitive and selective. Response is linear in the 30–300 μM H2O2 concentration range, and the detection limit is 0.15 μM.
KeywordsZero-valent iron particles Bismuth doping Ionic liquid coated nanoparticles TMB oxidation Stabilizing agent Peroxidase mimic Visual detection Hydrogen peroxide
This work has been supported by IRCBM, COMSATS Institute of Information Technology Lahore, Pakistan.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
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