design a new electrochemical sensor based on co-fe layered double hydroxide for simultaneous determination of hydroquinone, catechol, and resorcinol

Abstract: hydroquinone (hq), catechol (cc) and resorcinol (rs), isomers of dihydroxybenzene, are important organic intermediates for the products of industry and agriculture, considered highly toxic to both the environment and humans even at very low concentrations [1]. layered double hydroxides (ldh), also known as hydrotalcite like anionic clay, are a class of ionic lamellar compounds consisting of positively charged brucite-like layers and charge compensating anions and solvation molecules in the interlayer region [2]. in this work, an electrochemical sensor for dihydroxybenzene isomers was developed using a glassy carbon electrode modified electrochemically with fe-co layered double hydroxides (fe-co ldh). the modifier morphology and characteristics were determined by electrochemical impedance spectroscopy (eis) and field emission scanning electron microscopy (fesem). using electrochemical techniques, it was shown that the electrode's specific surface was significantly enhanced. the results obtained show that this novel sensor displays excellent electro-catalytic activity towards the oxidation of these isomers and that these cv peaks are well separated. the sensor was applied to the simultaneous determination of each of the three isomers using dpv with a linear response in the concentration range of 2.5 × 10-4 - 1.7 mm , 2.5×10-4 - 1.7 mm, and 1.2 ×10-3 - 0.42 mm for hq, cc, and rs, respectively. excellent reproducibility, selectivity, stability, and sensitivity results are achieved for the determination of hq, cc, and rs.