Abstract
In this work, gold and bismuth bimetallic nanoparticles decorated L-cysteine functionalized graphene oxide nanocomposites (Au-BiNPs/SH-GO) were prepared and applied to selective detection of Fe(III) in lake and seawater samples by modifying onto glassy carbon electrodes. Bimetallic nanoparticles have various excellent properties and better catalytic properties because of the unique synergistic effect between metals. The modified electrode was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. Under optimized conditions, current peak intensity increased linearly with increasing Fe(III) concentration over the range of 0.2–50 μM and a detection limit of 0.07 μM (S/N = 3). The Au-BiNPs/SH-GO/GCE was used for the determination of Fe(III) in lake and seawater samples with recoveries ranged from 90 to 103%. Those satisfactory results revealed the potential application of the Au-BiNPs/SH-GO electrochemical sensor for heavy metals detection in environmental monitoring.
Highlights
Iron is the fourth highest element in the crust with a total content of about 5% [1]
Gold and bismuth bimetallic nanoparticles decorated with L-cysteine functionalized graphene oxide nanocomposites (Au-BiNPs/SH-Graphene oxide (GO)) were prepared and applied to selective detection of Fe(III) in lake and seawater samples by modifying them on a glassy carbon electrode using the square wave voltammetry method (SWV)
Combined with the Energy dispersive X-ray spectroscopy (EDX) analysis analysis of Au-BiNPs/SH-GO/GCE in Figure 1D, the results showed that the main comof Au-BiNPs/SH-GO/GCE in Figure 1D, the results showed that the main components of ponents of Au-BiNPs/SH-GO/GCE are four elements of C, O, Au, Bi
Summary
Iron is the fourth highest element in the crust with a total content of about 5% [1]. In the past few decades, a large number of methods have been developed and applied to detect iron ions, including flame atomic absorption spectrometry [13], inductively coupled plasma mass spectrometry [14], reversed-phase high-performance liquid chromatography [15], electrochemistry [16,17], colorimetric analysis [18,19,20], and fluorescent spectrophotometry [21,22,23]. Gold and bismuth bimetallic nanoparticles decorated with L-cysteine functionalized graphene oxide nanocomposites (Au-BiNPs/SH-GO) were prepared and applied to selective detection of Fe(III) in lake and seawater samples by modifying them on a glassy carbon electrode using the square wave voltammetry method (SWV). Au-BiNPs/SH-GO/GCE was successfully applied for the detection of total dissolved iron ions in water samples with satisfactory results
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