Abstract
Sensitive, selective, and reproducible monitoring of multiple phenols simultaneously needs an electrochemical interface with a large surface area and a big amount of active sites. Herein, expanded graphite (EG) as the supporter is decorated with the sensing material of carbon-coated palladium oxide (PdO@C) nanoparticles. After its characterization using transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical techniques, this composite based electrochemical interface has been utilized for the voltammetric sensing of tetrabromobisphenol A (TBBPA), hydroquinone (HQ), and catechol (CC). Compared with either EG or PdO@C based interfaces, this one delivers much enhanced redox currents for three phenols. Individual and simultaneous detection of TBBPA, HQ, and CC has been realized at nano-molar levels. The calculated detection limits are 1.3, 26, and 17 nM for TBBPA, HQ, and CC, respectively. Such an interface thus owns great prospect in constructing a universal platform for individual and simultaneous detection of multiple phenols in different samples.
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