Hydrogen peroxide monitoring in Fenton reaction by using a ruthenium oxide hexacyanoferrate/multiwalled carbon nanotubes modified electrode

Abstract

a b s t r a c tA novel amperometric sensor based on the incorporation of ruthenium oxide hexacyanoferrate (RuOHCF) into multiwalled carbon nanotubes (MWCNTs) immobilized on a glassy carbon electrode is described. Cyclic voltammetry experiments indicated that the cathodic reduction of hydrogen peroxide at the RuOHCF/MWCNTs100/GC modified electrode is facilitated, occurring at 0.0 V vs. Ag/AgCl/KCl (sat) . Following the optimization of the experimental conditions, the proposed sensor presented excellent analytical properties for hydrogen peroxide determination, with a low limit of detection (4.7 lmol L À1 ), a large dynamic concentration range (0.1-10 mmol L À1 ) and a sensitivity of 1280 lA mmol À1 L cm À2 . The usefulness of the RuOHCF/MWCNTs100/GC electrochemical sensor was confirmed by monitoring the consumption of hydrogen peroxide during the degradation of phenol by the Fenton reaction.

pH-Dependent Catalytic Behavior in Cathodic Application of Hydrogen Peroxide with Cobalt Oxide Modified Electrode and Its Application in Electrochemical Fenton Process in Alkaline Media

“…However, since water is considered as the typical product of chemical reduction of hydrogen peroxide, a proton-rich medium should prompt this electrochemical reaction. 23 The opposite pH-related behavior found on a cobalt oxide modified electrode implies that this electrochemical reaction does not require an extra proton; thus, decomposition of hydrogen peroxide might better explain this reaction. According to previous reports, cobalt ion is an ideal catalyst which can convert hydrogen peroxide into oxygen via the following cyclic reaction: 24,25 2…”

Assessment of Oxidative Stress by Detection of H2O2 in Rye Samples Using a CuO- and Co3O4-Nanostructure-Based Electrochemical Sensor

“…Also, along with other processes, electron transfer reactions take place: metal-oxide nanostructures undergo electron transfer with H 2 O 2 , leading to the generation of reactive oxygen species such as hydroxyl radicals ( • OH). This process is known as the Fenton reaction [48] and can be enhanced by the presence of transition metal ions such as iron or copper. The second process is catalytic decomposition, where metal-oxide nanostructures act as catalysts for the breakdown of H 2 O 2 into water and oxygen.…”

Scalable production of hydroxyl radicals (.OH) via homogeneous photolysis of hydrogen peroxide using a continuous-flow photoreactor

“…For the detection of . OH, primarily as adducts in various matrices, numerous detection systems have been employed, such as electrochemical (EC) detection systems including cyclic voltammetry [16][17][18][19][20][21][22] and amperometry [23,24], photometric detection systems such as UV detection [24], fluorescence [25], chemiluminescence [26,27] as well as spectroscopic systems such as electron spin resonance (ESR) [4] and resonance scattering (RS) [28]. These methods require specific reagents and/or complex derivatization processes, which usually trap the .…”