Yu, Tian and Herdman, Karen and Rupa Kasturi, Palanisamy and Breslin, Carmel B. (2023) The ultrasensitive detection of p-nitrophenol using a simple activated carbon electrode modified with electrodeposited bismuth dendrites. Microchemical Journal, 195. p. 109453. ISSN 0026-265X

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Abstract

Bismuth dendrites were electrodeposited onto an activated glassy carbon electrode and the resulting modified electrode was employed in the electrochemical detection of para-nitrophenol, an aromatic aquatic pollutant. The carbon electrode was activated by cycling between − 2.0 and 2.0 V vs. SCE to create active sites that can promote the electron transfer reaction. Bismuth dendrites were subsequently deposited at a potential of − 1.0 V vs. SCE for 400 s. A near 5-fold increase in the peak current associated with the conversion of para-nitrophenol (100 μM) to para-hydroxyaminophenol was obtained on activating the glassy carbon electrode. A more impressive 7-fold increase in the peak current was achieved on decorating the activated glassy carbon with bismuth dendrites. Calibration curves with linear regions from 1.6 to 170 μM and between 0.005 and 1.6 μM para-nitrophenol were obtained to give a LOD value of 0.18 nM and a sensitivity of 29.4 μA μM− 1 cm− 2 for the lower concentration range. Good repeatability, reproducibility and selectivity were achieved, while recovery values between 96.5 and 106.7 % were obtained in water samples. In addition, the bismuth dendrites were easily regenerated through an oxidation step at 0.6 V vs. SCE followed by a 400 s electrodeposition period in 1.0 mM Bi(III).

Item Type:	Article
Keywords:	Para-nitrophenol; Bismuth dendrites; Activated glassy carbon; Electrochemical sensor; Electrodeposition;
Academic Unit:	Faculty of Science and Engineering > Chemistry Faculty of Science and Engineering > Research Institutes > Human Health Institute
Item ID:	18869
Identification Number:	https://doi.org/10.1016/j.microc.2023.109453
Depositing User:	Dr. Carmel Breslin
Date Deposited:	12 Sep 2024 13:17
Journal or Publication Title:	Microchemical Journal
Publisher:	Elsevier B.V
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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