Electrochemical Detection of Hydroquinone by Square Wave Voltammetry using a Zn Layered Hydroxide-Ferulate (ZLH-F) Modified MWCNT Paste Electrode

Abstract

In this paper, a multiwall carbon nanotubes (MWCNT) paste electrode modified by a Zn layered hydroxide-ferulate (ZLH-F) was used for detection of hydroquinone (HQ). The morphology and characteristic of the ZLH-F/MWCNT was investigated by scanning electron microscope (SEM), transmission electron microscope (TEM) and square wave voltammetry (SWV). Under optimal conditions, the SWV response showed linear plot for HQ concentration in the range of 1.0×10 -5 M -1.0×10 -3 M. The detection limit was found to be 5.7×10 -6 M and correlation coefficient of 0.9957. The glucose, fructose, sucrose, bisphenol A, acetaminophen, lysine, NO 3 -, Cl -and SO 4 2-did not interfere the HQ response. This modified electrode can be used to determine HQ content in wastewater and cosmetic cream with range of recovery 97.8% -103.0%.