Anodic Oxidation of Aqueous Wastes Containing Hydroquinone on BDD Electrode

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Hassen Trabelsi ◽  
Nasr Bensalah ◽  
Abdellatif Gadri
Keyword(s):  
High Efficiency ◽  
Supporting Electrolyte ◽  
Electrochemical Process ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Boron Doped ◽  
Electro Oxidation ◽  
Discontinuous Mode ◽  
Hplc Analyses

AbstractThe electrochemical oxidation of 1,4 dihydroxybenzene, was studied by galvanostatic electrolysis using boron-doped diamond (BDD) as anode. The efficiency of the electrochemical process was found to depend mainly on the pollutant concentration present in the waste and on the applied current density. The voltammetric results showed that hydroquinone oxidation takes place in the same potential region as that of phenol where the supporting electrolyte is stable. Synthetic wastewaters containing hydroquinone have been treated in a bench-scale electrolysis plant. This plant operates in a discontinuous mode by recirculating the waste continuously through a single-chamber electrochemical flow cell. The complete mineralization of hydroquinone and the electro-generated pollutants is obtained in the electrolytic device. HPLC analyses show the formation of carboxylic acids as the main intermediates. The high efficiency of this technology can be explained in terms of the direct electro-oxidation at the BDD surface and the oxidation carried out by hydroxyl radicals and other electro-generated oxidants.

scholarly journals Electrochemical Treatment of synthetic and Actual Dyeing Wastewaters Using BDD Anodes

2010 ◽  
Vol 3 ◽  
pp. ASWR.S3639 ◽  
Author(s):  
Nasr Bensalah ◽  
Ahmed Abdel-Wahab
Keyword(s):  
Supporting Electrolyte ◽  
Great Influence ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Operating Conditions ◽  
Anode Surface ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Toc Removal ◽  
Boron Doped

In this work, the treatment of synthetic wastewaters containing methylene blue (MB) and rhodamine B (RB) and actual textile wastewaters (ATW) using boron doped diamond (BDD) anodic oxidation was investigated. Voltammetric study has shown that both MB and RB can be oxidized directly at the anode surface in the potential region where the electrolyte salt is stable. Galvanostatic electrolyses of synthetic and actual industrial wastewaters have led to total abatement of COD and TOC at different operating conditions (electrolyte salt and initial pollutant concentration and current density) and the efficiency of the electrochemical process was governed only by mass-transfer limitations. The nature of the supporting electrolyte has a great influence on the rate and the efficiency of the electrochemical oxidation of dyes. The treatment in the presence of NaCl appears to be more efficient in the COD removal, while in the presence of Na2SO4 improves the TOC removal. From the experimental results it seems that the primary mechanisms in the oxidation of dyes are the mediated electro-oxidation by hydroxyl radicals and other oxidants electro-generated from supporting electrolyte oxidation.

scholarly journals Anodic oxidation of slaughterhouse wastewater on boron-doped diamond: process variables effect

2017 ◽  
Vol 76 (12) ◽  
pp. 3227-3235 ◽  
Author(s):  
Arwa Abdelhay ◽  
Inshad Jum'h ◽  
Enas Abdulhay ◽  
Akeel Al-Kazwini ◽  
Mashael Alzubi
Keyword(s):  
Current Density ◽  
Supporting Electrolyte ◽  
Cod Removal ◽  
Color Removal ◽  
Process Variables ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Turbidity Removal ◽  
Applied Current Density ◽  
Boron Doped

Abstract A non-sacrificial boron-doped diamond electrode was prepared in the laboratory and used as a novel anode for electrochemical oxidation of poultry slaughterhouse wastewater. This wastewater poses environmental threats as it is characterized by a high content of recalcitrant organics. The influence of several process variables, applied current density, initial pH, supporting electrolyte nature, and concentration of electrocoagulant, on chemical oxygen demand (COD) removal, color removal, and turbidity removal was investigated. Results showed that raising the applied current density to 3.83 mA/cm2 has a positive effect on COD removal, color removal, and turbidity removal. These parameters increased to 100%, 90%, and 80% respectively. A low pH of 5 favored oxidants generation and consequently increased the COD removal percentage to reach 100%. Complete removal of COD had occurred in the presence of NaCl (1%) as supporting electrolyte. Na2SO4 demonstrated lower efficiency than NaCl in terms of COD removal. The COD decay kinetics follows the pseudo-first-order reaction. The simultaneous use of Na2SO4 and FeCl3 decreased the turbidity in wastewater by 98% due to electrocoagulation.

scholarly journals Electrochemical oxidation and electroanalysis of paracetamol on a boron-doped diamond anode material in aqueous electrolytes

2021 ◽  
Author(s):  
Kouakou Etienne Kouadio ◽  
Ollo Kambiré ◽  
Konan Sylvestre Koffi ◽  
Lassine Ouattara
Keyword(s):  
Electrolyte Solution ◽  
Current Density ◽  
Supporting Electrolyte ◽  
Current Intensity ◽  
Applied Current ◽  
Boron Doped Diamond ◽  
Preparative Electrolysis ◽  
Applied Current Density ◽  
Bdd Electrode ◽  
Boron Doped

Electrochemical oxidation of paracetamol on boron-doped diamond (BDD) anode has been studied by cyclic voltammetry and preparative electrolysis. Quantification of paracetamol during electrolysis has been mainly realized by differential pulse voltammetry technique in the Britton-Robinson buffer solutions used as the supporting electrolyte. Various parameters such as current intensity, nature of the supporting electrolyte, temperature, and initial concentration of paracetamol have been investigated. The electrochemical characterization by the outer sphere Fe(III)/Fe(II) redox couple has also been performed, showing the metallic character of BDD electrode. The obtained linear dependency of the oxidation peak current intensity and paracetamol concentration indicates that BDD electrode can be used as an electrochemical sensor for the detection and quantification of paracetamol. The investi­gation of paracetamol degradation during preparative electrolysis showed that: (i) the degradation rate of paracetamol increases with increase of current intensity applied; (ii) for the initial concentrations of 10, 6 and 1 mM of paracetamol, its oxidation rate reaches 60, 78 and 99 % respectively, after 1 h of electrolysis in 0.3 M H2SO4 (pH 0.6) at applied current density of 70 mA cm-2; (iii) at temperatures of electrolyte solution of 28, 55 and 75 °C, paracetamol oxidation rate reached 85, 92 and 97 % respectively, after 2 h at applied current density of 70 mA cm2. From the investigation of the effect of pH value of electrolyte solution, it appears that oxidation of paracetamol is more favorable in acidic solution at pH 3 than solutions of higher pH values.

Electrochemical treatment of wastewaters containing 4-nitrocathecol using boron-doped diamond anodesA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (4) ◽  
pp. 683-689
Author(s):  
Nasr Bensalah ◽  
Mohamed F. Ahmadi ◽  
Abdelatif Gadri
Keyword(s):  
Electrochemical Oxidation ◽  
Carboxylic Acids ◽  
Aromatic Ring ◽  
Supporting Electrolyte ◽  
Electrochemical Treatment ◽  
Boron Doped Diamond ◽  
Potential Region ◽  
Polymeric Product ◽  
Boron Doped ◽  
Mineral Product

The electrochemical oxidation of aqueous wastes polluted with 4-nitrocathecol has been studied on boron-doped diamond electrodes in an acidic medium. The voltammetric results showed that 4-nitrocathecol is oxidized in the potential region where the supporting electrolyte is stable. Galvanostatic electrolysis study showed that the oxidation of these wastes in a single-compartment electrochemical flow cell with boron-doped diamond anodes results in the complete mineralization of the organics. Cathecol, benzoquinone, 4-aminocathecol, maleic and oxalic acids have been detected as soluble organics, polymeric product as solid product at the cathode surface and NO3– as mineral product during the electrolysis of 4-nitrocathecol. The electrochemical oxidation of 4-nitrocathecol consists of a sequence of steps: release of NO2 and (or) hydroxylation of the aromatic ring; formation of quinonic compounds; oxidative opening of aromatic ring to form carboxylic acids; and oxidation of carboxylic acids to carbon dioxide. Both direct and mediated oxidation processes are involved in these stages.

scholarly journals Low-coherence photonic method of electrochemical processes monitoring

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Monika Kosowska ◽  
Paweł Jakóbczyk ◽  
Michał Rycewicz ◽  
Alex Vitkin ◽  
Małgorzata Szczerska
Keyword(s):  
Electrochemical Process ◽  
Electrochemical Measurements ◽  
Boron Doped Diamond ◽  
Silica Substrate ◽  
Low Coherence ◽  
Optical Responses ◽  
Boron Doped ◽  
Fabry Perot ◽  
Hybrid Characterization

AbstractWe present an advanced multimodality characterization platform for simultaneous optical and electrochemical measurements of ferrocyanides. Specifically, we combined a fiber-optic Fabry–Perot interferometer with a three-electrode electrochemical setup to demonstrate a proof-of-principle of this hybrid characterization approach, and obtained feasibility data in its monitoring of electrochemical reactions in a boron-doped diamond film deposited on a silica substrate. The film plays the dual role of being the working electrode in the electrochemical reaction, as well as affording the reflectivity to enable the optical interferometry measurements. Optical responses during the redox reactions of the electrochemical process are presented. This work proves that simultaneous opto-electrochemical measurements of liquids are possible.

scholarly journals A Comparative Electrochemical-Ozone Treatment for Removal of Phenolphthalein

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
V. M. García-Orozco ◽  
C. E. Barrera-Díaz ◽  
G. Roa-Morales ◽  
Ivonne Linares-Hernández
Keyword(s):  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Ozone Treatment ◽  
Acidic Ph ◽  
Alkaline Ph ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Electrochemical Processes ◽  
Density Values

The degradation of aqueous solutions containing phenolphthalein was carried out using ozone and electrochemical processes; the two different treatments were performed for 60 min at pH 3, pH 7, and pH 9. The electrochemical oxidation using boron-doped diamond electrodes processes was carried out using three current density values: 3.11 mA·cm−2, 6.22 mA·cm−2, and 9.33 mA·cm−2, whereas the ozone dose was constantly supplied at 5±0.5 mgL−1. An optimal degradation condition for the ozonation treatment is at alkaline pH, while the electrochemical treatment works better at acidic pH. The electrochemical process is twice better compared with ozonation.

Comparing atrazine and cyanuric acid electro-oxidation on mixed oxide and boron-doped diamond electrodes

2013 ◽  
Vol 34 (8) ◽  
pp. 1043-1051 ◽  
Author(s):  
Geoffroy R.P. Malpass ◽  
Giancarlo R. Salazar-Banda ◽  
Douglas W. Miwa ◽  
Sérgio A.S. Machado ◽  
Artur J. Motheo
Keyword(s):  
Mixed Oxide ◽  
Cyanuric Acid ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Electro Oxidation

scholarly journals Development of an Electrochemical Process for Blackwater Disinfection in a Freestanding, Additive-Free Toilet

2017 ◽  
Author(s):  
Katelyn Sellgren ◽  
◽  
Christopher Gregory ◽  
Michael Hunt ◽  
Ashkay Raut ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Process ◽  
Mixed Metal Oxide ◽  
Boron Doped Diamond ◽  
High Effectiveness ◽  
Electrochemical Disinfection ◽  
E Coli ◽  
Boron Doped ◽  
Improved Sanitation ◽  
Conventional Wastewater Treatment

Electrochemical disinfection has gained interest as an alternative to conventional wastewater treatment because of its high effectiveness and environmental compatibility. Two and a half billion people currently live without improved sanitation facilities. Our research efforts are focused on developing and implementing a freestanding, additive-free toilet system that treats and recycles blackwater on site. In this study, we sought to apply electrochemical disinfection to blackwater. We compared commercially available boron-doped diamond (BDD) and mixed metal oxide (MMO) electrodes for disinfection efficiency in E. coli–inoculated model wastewater. The MMO electrodes were found to be more efficient and thus selected for further study with blackwater. The energy required for disinfection by the MMO electrodes increased with the conductivity of the medium, decreased with increased temperature, and was independent of the applied voltage. Fecal contamination considerably increased the energy required for blackwater disinfection compared to model wastewater, demonstrating the need for testing in effluents representing the conditions of the final application.

scholarly journals Comparison of Pyridazinium Electro-oxidation on Boron-doped Diamond (BDD) and SnO2 in a Basic Medium

2015 ◽  
Vol 33 (1) ◽  
pp. 13-21 ◽  
Author(s):  
H Bouya ◽  
M Errami ◽  
R Salghi ◽  
A Jodeh ◽  
S Messali ◽  
...  
Keyword(s):  
Basic Medium ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Electro Oxidation
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