Determination of Catechol and Hydroquinone by Using Perilla frutescens Activated Carbon Modified Glassy Carbon Electrode

Abstract

High specific surface area activated carbon prepared by Perilla frutescens (PFHSAAC) was modified on the surface of the glassy carbon electrode (GCE) by drop-coating method to construct a PFHSAAC/GCE. The electrochemical properties of the modified electrode were investigated in detail by some electrochemical methods such as cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Experiment results show that the modified electrode has excellent redox activity and distinction capability toward the two isomers of catechol (CC) and hydroquinone (HQ). The separation of oxidation peak potential for HQ and CC of DPV is 112.8 mV. Under the optimal conditions, the oxidation peak currents of HQ and CC show good linear relationships with their concentrations in the ranges of 1.0 × 10-6-2.0 × 10-4 and 1.0 × 10-6-1.5 × 10-4 mol L-1 , respectively. The limits of detection for HQ and CC are 3.57 × 10-7 and 4.23 × 10-7 mol L-1 , respectively. The PFHSAAC/GCE exhibits good stability, repeatability and sensitivity. The developed method was used to determine HQ and CC in water samples with best results.

Porous tal palm carbon nanosheets as a sensing material for simultaneous detection of hydroquinone and catechol

“…This greater current response of PTPCNS/GCE suggested PTPCNS had impressive electroactive surface area which enhanced the electrochemical reaction. [ 34 ] Effective surface area of PTPCNS/GCE and GCE were calculated according to Randles‐Sevcik equation, I p = 2.69 × 10 5 AD 1/2 n 3/2 ν 1/2 C, [ 35 ] (where I p represented the peak current of the electrochemical probe, A indicated the effective surface area of the electrode, D represented the diffusion coefficient of the reactant, n denoted the number of electron(s) transferred in electrode reaction, υ was the scan rate and C indicated the concentration of the electrochemical probe) the calculated effective surface area of GCE was 0.06 cm 2 and for PTPCNS/GCE was 0.076 cm 2 . The effective surface area of PTPCNS/GCE was 1.27 times higher than that of GCE.…”

“…These results suggested better electrocatalytic activity and higher sensitivity of PTPCNS/GCE compared to GCE. [ 35,36 ]…”

“…These results suggested better electrocatalytic activity and higher sensitivity of PTPCNS/GCE compared to GCE. [35,36] EIS is an analytical technique that can assess the interfacial properties of electrodes in electrochemical reaction. The electrochemical surface property, particularly electron transfer properties of GCE and PTPCNS/GCE were explored by correlating EIS technique, using K 3 [Fe(CN) 6 ] in 1 M KCl solution as electrochemical probe.…”

“…These CV and DPV data ensured that detection of HQ and CT simultaneously would be possible at PTPCNS/GCE as modifier materials. [35,38]…”