Key Words:PLASMONIC RESPONSE; FE2+; NANOCLUSTERS; SENSOR; IONS
Abstract:MnSiO3 nanoparticles (NPs) were prepared by precipitation method, their structure and composition were characterised by transmission electron microscopy, electron diffraction spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Due to the oxidase-like enzyme activity of MnSiO3, it can catalyse the substrate 3,3',5,5'-tetramethylbenzidine (TMB) in acidic environment to form an oxidised TMB which has an absorption peak at 652 nm in the absence of hydrogen peroxide. When Fe2+ was added to the assay, the oxidase-like activity of MnSiO3 was inhibited, and the intensity of the absorption at 652 nm was reduced. Based on the high oxidase-like activity, a colorimetric method for Fe2+ detection was established, it showed high selectivity and sensitivity. In the optimised conditions, the limit of detection was 0.5 mu M with a linear range from 3 to 63 mu M. Moreover, the method was applied to determine Fe2+ in spiked water samples which gave satisfactory recoveries.
Volume:15
Issue:12
Translation or Not:no