Abstract
Hydroquinone (HQ) and catechol (CT) are considered as environmental pollutants with high toxicity. We have developed a simple electrochemical sensor using an anodized glassy carbon electrode modified with a stable 2-(phenylazo) chromotropic acid- (CH-) conducting polymer (PCH/AGCE). The PCH/AGCE sensor showed good electrocatalytic activity and reversibility towards the redox of HQ and CT in phosphate buffer solution (PBS, pH 7.0). The cyclic voltammetry (CV) in mixed solution of HQ and CT showed that the oxidation peaks of them became well resolved with a peak separation of 0.1 V. The detection limits of HQ and CT were 0.044 and 0.066 μM, respectively, in a wide linear response range of 1–300 μM for both. Moreover, the sensor displayed an excellent selectivity in the presence of common interferences. This study provided a simple, sensitive, and high recovery method for simultaneous and quantitative determination of HQ and CT in aqueous medium.
Highlights
HQ (1,4-benzenediol) and CT (1,2-benzenediol) have been widely used in cosmetics, pesticides, tanned leather, spices, medicines, and photography chemicals [1,2,3]
Azobenzene compounds that consist of the azo group (− N=N− ) and large π-conjugated ring system have been adopted to prepare conducting polymers (CPs) for the detection of biomolecules such as dopamine [25, 26]
Electrochemical Behavior of HQ and CT. e number of sweeping cycles was firstly optimized by means of peak current towards HQ and CT (100 μM of each) in PBS, which clearly displayed that 20 cycles exhibited the highest currents for both HQ and CT, as shown in Figure S2. en, the electrochemical behavior of PCH/AGCE was studied using cyclic voltammetry (CV) (Figure 4(a)) in PBS and a mixture of HQ and CT to compare with bare GCE and AGCE
Summary
HQ (1,4-benzenediol) and CT (1,2-benzenediol) have been widely used in cosmetics, pesticides, tanned leather, spices, medicines, and photography chemicals [1,2,3]. En, the electrochemical behavior of PCH/AGCE was studied using CV (Figure 4(a)) in PBS and a mixture of HQ and CT to compare with bare GCE and AGCE. PCH/AGCE clearly showed higher currents resulting in a better catalytic sensitivity.
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