Direct anodization–reduction nanomodification of gold films: investigating electrocatalysis of the emerging contaminant halobenzoquinone

Júnior, José Antônio de Oliveira; Siqueira, Gilvana Pereira; Ribeiro, Lara Kelly; Coelho, Dyovani; Longo, E.; Batista, André Mourão; Kraatz, Heinz‐Bernhard; Tanaka, Auro Atsushi; Dantas, Luiza Maria Ferreira; Garcia, Marco Aurélio Suller; Silva, Iranaldo Santos da

doi:10.1007/s10853-021-06616-4

Cited by 6 publications

(1 citation statement)

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“…For instance, bismuth film combined with nanomaterials, such as carbon nanotubes, reduced graphene oxide, and clay materials, has been reported as sensitive modified electrodes for uranium, cadmium, and lead . In general, the numerous available redox sites, coupled with the electrocatalytic effect of nanomaterials, have been explored as a powerful tool for determining organic pollutants. − The high surface-to-volume ratio of nanoparticles can be harnessed in stripping voltammetric analysis, enhancing analyte preconcentration onto the electrode surface . Moreover, the primary challenge in heavy metal determination is to obtain an inert nanomodified electrode in the cathodic potential range.…”

Section: Introductionmentioning

confidence: 99%

Core–Shell Chitosan Cobalt Ferrite Nanoparticles for Ultrasensitive Simultaneous Voltammetric Determination of Pb(II) and Cd(II)

Neto,

Costa,

Morawski

et al. 2024

ACS Appl. Nano Mater.

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In water samples from industrial regions, the presence of highly toxic and nonbiodegradable heavy metal ions (HMI) poses a significant threat to environmental quality. While analytical methods based on mercury electrodes are widely recognized for their high performance in the sensitive and selective quantification of various metal contaminants, the development of environmentally friendly strategies for the voltammetric determination of HMI remains a formidable challenge. In this study, we propose a material utilizing small-size chitosan (CTS) cobalt ferrite core–shell nanoparticles (CoFe2O4@CTS) as an electrode modifier for the simultaneous voltammetric determination of Pb(II) and Cd(II). The magnetic nanoparticles were synthesized using the solvothermal method and characterized using various techniques to explore their crystalline structure, magnetic properties, and chemical composition. The resulting electrochemical sensor, CoFe2O4@CTS/GCE, was generated through a one-step modification of a glassy carbon electrode (GCE). Utilizing differential pulse adsorptive stripping voltammetry (DPAdSV), our proposed sensor exhibited high sensitivity, with low limits of detection (LOD) values of 0.04 and 0.31 μg L–1 (E d = −1.0 V; t d = 90 s) for lead and cadmium, respectively. The exceptional sensitivity observed is indicative of interactions between HMI and CTS amine groups, leading to the effective preconcentration of the analytes. Furthermore, our sensor demonstrated excellent selectivity with an interference response below 8.93% for Pb(II) and 20% for Cd(II). Accuracy was evaluated using SRM 1643e (NIST). The application of green analytical chemistry (GAC) metrics resulted in a score of 0.91, highlighting the environmentally conscious aspects of our methodology.

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