期刊
NANOMATERIALS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/nano12091450
关键词
pyridine; carboxylated multiwalled carbon nanotubes; gold nanoparticles; gold staining; linear sweep anodic stripping voltammetry; As(III) analysis
类别
资金
- National Natural Science Foundation of China [22074039, 21675050, 22002042]
A novel electrode for sensitive analysis of As(III) was prepared, by cast-coating multiwalled carbon nanotubes on a glassy carbon electrode, enabling stable loading of gold nanoparticles and gold staining for efficient detection of As(III) through linear sweep anodic stripping voltammetry.
A Au-stained Au nanoparticle (Au-s)/pyridine (Py)/carboxylated multiwalled carbon nanotubes (C-MWCNTs)/glassy carbon electrode (GCE) was prepared for the sensitive analysis of As(III) by cast-coating of C-MWCNTs on a GCE, electroreduction of 4-cyanopyridine (cPy) to Py, adsorption of gold nanoparticles (AuNPs), and gold staining. The Py/C-MWCNTs/GCE can provide abundant active surface sites for the stable loading of AuNPs and then the AuNPs-initiated Au staining in HAuCl4 + NH2OH solution, giving a large surface area of Au on the Au-s/Py/C-MWCNTs/GCE for the linear sweep anodic stripping voltammetry (LSASV) analysis of As(III). At a high potential-sweep rate of 5 V s(-1), sharp two-step oxidation peaks of As(0) to As(III) and As(III) to As(V) were obtained to realize the sensitive dual-signal detection of As(III). Under optimal conditions, the ASLSV peak currents for oxidation of As(0) to As(III) and of As(III) to As(V) are linear with a concentration of As(III) from 0.01 to 8 mu M with a sensitivity of 0.741 mA mu M-1 and a limit of detection (LOD) of 3.3 nM (0.25 ppb) (S/N = 3), and from 0.01 to 8.0 mu M with a sensitivity of 0.175 mA mu M-1 and an LOD of 16.7 nM (1.20 ppb) (S/N = 3), respectively. Determination of As(III) in real water samples yielded satisfactory results.
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