Voltammetry demonstrates effective catechol detection in interference from ascorbic acid and phenol using CNT-PVA electrodes, suggesting robustness for real-world applications.
Carbon electrodes coated with polyvinyl alcohol (PVA) dispersed multi-walled carbon nanotubes (MWCNTs) were prepared and compared to the bare carbon electrode as sensors for detecting catechol in presence of common interference and phenol. The voltammetry response of catechol on a functionalized CNT-PVA electrode was excellent compared to the traditional bare carbon electrode at a sweep rate of 100mV/s. Without prior separation, the voltammogram of catechol at the CNT-PVA electrode displayed more reversible behavior to detect catechol in the presence of common interference, ascorbic acid. The effect of the scan rate onthe CNT-PVA electrode performance showed that the detection process was diffusion controlled with a correlation coefficient approximately 1. Thus, the CNT-PVA electrode displayed simultaneous determination of catechol in the presence of ascorbic acid. The CNT-PVA electrode was also used to detect phenol since phenol has similar structure to catechol. The selectivity of the CNT-PVA electrode to detect phenol in acidic and basic conditions is observed. The Scanning Electron Microscopy (SEM) technique allowed for analysis of the PVA dispersed MWCNTs. The advantages of this environmental sensor was introduced into our undergraduate and graduate students curriculum to enhance their understanding of real-world analysis and challenges that may be encountered in sensor development.
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Lee et al. (2016) studied this question.
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