Electrochemical sensing of lead in drinking water using β-cyclodextrin-modified MWCNTs

[Display omitted] A simple, facile and low-cost modification of multiwalled carbon nanotubes (MWCNT) with β-cyclodextrin (βCD) through a physical (Phys) and a covalent approach via Steglich esterification (SE) is demonstrated for the detection of lead (Pb). The Pb sensing performance is governed by...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 296; p. 126632
Main Authors Alam, Arif Ul, Howlader, Matiar M.R., Hu, Nan-Xing, Deen, M. Jamal
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2019
Subjects
Electrochemical sensing
Heavy metal
Lead
MWCNT
β-Cyclodextrin
Lead
β-Cyclodextrin
Electrochemical sensing
MWCNT
Heavy metal
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Summary:[Display omitted] A simple, facile and low-cost modification of multiwalled carbon nanotubes (MWCNT) with β-cyclodextrin (βCD) through a physical (Phys) and a covalent approach via Steglich esterification (SE) is demonstrated for the detection of lead (Pb). The Pb sensing performance is governed by the amount of βCD present in the MWCNT-βCD matrix and the physical/chemical attachment of βCD with MWCNT. The physically modified MWCNT-βCD based electrode showed high sensitivity of 98 nA/ppb with a limit of detection of 0.9 ppb but poorer reliability, whereas the chemically modified MWCNT-βCD electrode results in moderate sensitivity of 38.6 nA/ppb and a limit of detection of 2.3 ppb. The modified sensors showed reproducibility of more than 90% and reusability of at least six times. The proposed sensors offer a promising technology in developing a highly affordable and sensitive electrochemical sensing system for monitoring the Pb level in drinking water.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2019.126632