Journal
CHINESE CHEMICAL LETTERS
Volume 31, Issue 10, Pages 2752-2756Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2020.06.021
Keywords
Bismuth nanoparticle; Multi-walled carbon nanotube; Electrochemical sensor; Hg(II); Cu(II)
Categories
Funding
- Tianjin Natural Science Foundation [18JCZDJC99800, 7JCQNJC00900]
- National Natural Science Foundation of China [51502203]
- Tianjin Young Overseas High-level Talent Plans [01001502]
- Tianjin Science and Technology Foundation [17ZXZNGX00090]
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Electrochemical analysis is a promising technique for detecting biotoxic and non-biodegradable heavy metals. This article proposes a novel composite electrode based on a polyaniline (PANi) framework doped with bismuth nanoparticle@graphene oxide multi-walled carbon nanotubes (BiNPs@GO-MWCNTs) for the simultaneous detection of multiple heavy metal ions. Composite electrodes are prepared on screen-printed electrodes (SPCEs) using an efficient dispensing technique. We used a SM200SX-3A dispenser to load a laboratory-specific ink with optimized viscosity and adhesion to draw a pattern on the work area. The SPCE was used as substrate to facilitate cost-effective and more convenient real-time detection technology. Electrochemical techniques, such as cyclic voltammetry and differential pulse voltammetry, were used to demonstrate the sensing capabilities of the proposed sensor. The sensitivity, limit of detection, and linear range of the PANi-Bi NPs@GO-MWCNT electrode are 2.57 x 10(2) mA L mmol(-1) cm(-2), 0.01 nmol/L, and 0.01 nmol/L-5 mmol/L and 0.15 x 10(-1) mA L mmol(-1) cm(-2), 0.5 nmol/L, and 0.5 nmol/L-5 mmol/L for mercury ion (Hg(II)) and copper ion (Cu(II)) detection, respectively. In addition, the electrode exhibits a good selectivity and repeatability for Hg(II) and Cu(II) sensing when tested in a complex heavy metal ion solution. The constructed electrode system exhibits a detection performance superior to similar methods and also increases the types of heavy metal ions that can be detected. Therefore, the proposed device can be used as an efficient sensor for the detection of multiple heavy metal ions in complex environments. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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