Electrochemical Technologies for Detecting and Degrading Benzoquinone Using Diamond Films

Abstract

In this work, the detection and quantification of p‐benzoquinone (BQ) was performed by differential pulse voltammetry (DPV) with a diamond film sensor. The calibration curve and the limits of detection and quantification for BQ were estimated. DPV was compared to high‐performance liquid chromatography (HPLC) analysis, leading to a satisfactory result in terms of stability and sensitive response. As a novel aim, a combined electrochemical method for environmental application has been developed to oxidize and detect BQ using diamond films. A set of galvanostatic electrochemical oxidation experiments with 130 mL of BQ solution were accomplished in order to understand the effect of current density, the concentration of the pollutant and the initial pH using different electrolytes with similar conductivity. The optimal operating conditions were achieved at 33.3 mA cm−2, 100 mg L−1 of BQ at pH 5.0 with 50 mM Na2SO4. Additionally, the evolution of short‐chain carboxylic acids of that test was followed over time in order to suggest a possible degradation route. The results were described and discussed in the light of the existing literature.

Towards Use of Persulfate Electrogenerated at Boron Doped Diamond Electrodes as Ex-Situ Oxidation Approach: Storage and Service-Life Solution Parameters

“…Electroanalytical measurements.-Electroanalytical measurements were carried out in a conventional three-electrode system in Pyrex material with a capacity of 25 ml for determining MO, 1,4-BQ and CF concentrations by differential pulse voltammetry (DPV) analysis. 17,19,20 BDD anode (silicon substrate, 500 ppm of boron doping, 2-3 μm of thickness), with an exposed geometric area of 0.28 cm 2 , was used as the working electrode, while a platinum wire and Ag/AgCl (KCl 3 M) were employed as the auxiliary and reference electrodes, respectively. DPV experiments were performed with an Autolab PGSTAT 320 N model to establish an analytical curve by measuring different concentrations of MO, 1,4-BQ and CF solutions in 0.5 M Na 2 SO 4 .…”

“…Electroanalytical approach: MO, CF and 1,4 BQ quantification by DPV.-Analytical curves with BDD sensor were previously obtained by standardizing and optimizing the quantification methodology of MO, CF and 1,4 BQ. 17,19,20 Different MO, CF and 1,4 BQ Table I. Apparent rate constants for decomposition of oxidants solution, fresh-persulfate and cold-persulfate solutions electrosynthetized at 30, 45 and 60 mA cm −2 , stored at different temperatures.…”

Application of a Novel Ti/nanoSnO2-α-Fe2O3Anode for the Electro-Catalytic Degradation of Dye Pollutant: Optimization of Operational Parameters by Central Composite Design

“…6a that, the simultaneous increase of both variables (current density and electrolysis time) could accelerate the rate of electrons and oxidizing agents (OH•, HO 2 •, ozone, or active chlorine) formation during electro-chemical reactions, resulting in the enhanced electrochemical oxidation capability of AY3 dye species in the aqueous solution. 7,45 Despite this, further increasing current density reduced color removal efficiency in somewhat due to the fact that charge and •OH radicals generated on the electrode surface during electrolysis were consumed through some side reactions such as oxygen evaluation reaction (OER) as well as competition of side reaction with the electrochemical oxidation of contaminants. 42,46 Figure 6b presents the data on color removal efficiency and as can be observed, the color removal of AY3 increased by decreasing pH at all applied current densities.…”

Highly porous seeding-free boron-doped ultrananocrystalline diamond used as high-performance anode for electrochemical removal of carbaryl from water

“…( 1) which can attack organic pollutants (R) nonselectively, turning them into non-hazardous products or even leading them to complete combustion, as shown in Eq. ( 2) below (do Vale Júnior et al, 2019;Brillas, 2021;Karim et al, 2021;Mostafa et al, 2021).…”