Fabrication of highly sensitive Bisphenol A electrochemical sensor amplified with chemically modified multiwall carbon nanotubes and β-cyclodextrin

[Display omitted] •Developed high sensitive, simple, fast, and cheap electrochemical sensor for BPA detection.•One step steglich esterification synthesises chemically modified MWCNTs- βCD providing effective attachment with fast electron transfer.•Combined effect of hydrophilic behavior of βCD and l...

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Published in:Sensors and actuators. B, Chemical Chemical, 2020-10, Vol.320, p.128319, Article 128319
Main Authors: Ali, Md Younus, Alam, Arif Ul, Howlader, Matiar M.R.
Format: Article
Language:English
Subjects:
Bisphenol A
Carbon
Chemical sensors
Correlation coefficients
Cyclodextrins
Drinking water
Electrochemical sensing
Leaching
Low level
Multi wall carbon nanotubes
MWCNTs- βCD
Oxidation
Screen-Printed carbon electrode
Sensors
Voltammetric detection
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Summary:[Display omitted] •Developed high sensitive, simple, fast, and cheap electrochemical sensor for BPA detection.•One step steglich esterification synthesises chemically modified MWCNTs- βCD providing effective attachment with fast electron transfer.•Combined effect of hydrophilic behavior of βCD and large surface area of MWCNTs offered enhanced host-guest interaction with BPA. Bisphenol A (BPA), one of the most extensively used plasticizers, is an endocrine disrupting chemical (EDC). Leaching of BPA in food, and water sources causes adverse health effects, therefore, it requires monitoring. In this work, we developed a simple, low-cost electrochemical sensor for detecting a very low level of BPA in water using chemically modified multiwall carbon nanotubes (MWCNTs) with β-cyclodextrin (βCD) on screen-printed carbon electrode (SPCE). The electrochemical sensing of BPA showed a completely irreversible process with diffusion-controlled oxidation involving two electrons and two protons. At an optimized condition, the sensor showed a two-step linear response from 125 nM to 2 μM and 2 to 30 μM, with correlation coefficients of 0.997 and 0.995, respectively. The limit of detection for BPA was determined to be 13.76 nM (SNR = 3). The improved sensing performance is attributed to host-guest interaction ability of MWCNTs- βCD with BPA due to the combined effect of hydrophilic behavior of βCD and large surface area of MWCNTs. The sensors exhibited an excellent reproducibility (RSD = 4.7 %) and stable response over five weeks and negligible interference with common chemical species in water. The sensor’s reliability test in lake and tap water showed an excellent recovery of BPA ranging from 96.05 %–108.70 %. These favorable results can enable the development of simple and cheap portable sensors for monitoring a wide range of BPA levels in the water.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.128319