scholarly journals ELECTROCHEMICAL INCINERATION OF SHORT-CHAIN CARBOXYLIC ACIDS WITH NB-SUPPORTED BORON DOPED DIAMOND ANODE: SUPPORTING ELECTROLYTE EFFECT INTO THE ELECTROGENERATED OXIDANT SPECIES (HYDROXYL RADICALS, HYDROGEN PEROXIDE AND PERSULFATE)

Química Nova ◽  
2020 ◽  
Author(s):  
Jorge Queiroz ◽  
Dayanne Moura ◽  
Elaine Santos ◽  
Bernardo Frontana-Uribe ◽  
Carlos Martínez-Huitle
Keyword(s):  
Hydrogen Peroxide ◽  
Carboxylic Acids ◽  
Hydroxyl Radicals ◽  
Supporting Electrolyte ◽  
Short Chain ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Electrochemical Incineration

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.

Pt-implanted Boron-doped Diamond Electrodes for Electrochemical Oxidation of Hydrogen Peroxide

2004 ◽  
Vol 33 (10) ◽  
pp. 1330-1331 ◽  
Author(s):  
Tribidasari A. Ivandini ◽  
Rika Sato ◽  
Yoshihiro Makide ◽  
Akira Fujishima ◽  
Yasuaki Einaga
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Oxidation ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Oxidation Of Hydrogen

Electrochemical incineration of vinasse in filter-press-type FM01-LC reactor using 3D BDD electrode

2008 ◽  
Vol 58 (12) ◽  
pp. 2413-2419 ◽  
Author(s):  
J. L. Nava ◽  
A. Recéndiz ◽  
J. C. Acosta ◽  
I. González
Keyword(s):  
Aqueous Media ◽  
Three Dimensional ◽  
Oxygen Demand ◽  
Electrochemical Reactor ◽  
Filter Press ◽  
Boron Doped Diamond ◽  
Diamond Electrode ◽  
Boron Doped ◽  
Boron Doped Diamond Electrode ◽  
Electrochemical Incineration

This work shows results obtained in the electrochemical incineration of a synthetic vinasse with initial chemical oxygen demand (COD) of 75.096 g L−1 in aqueous media (which resembles vinasse industrial wastewater). Electrolyses in a filter-press-type FM01-LC electrochemical reactor equipped with a three-dimensional (3D) boron doped diamond electrode (BDD) were performed at Reynolds values between 22 ≤ Re ≤ 109, and a fixed current density of 10 mA cm−2. The electrochemical incineration achieved up to 97% in vinasse mineralization with current efficiencies that surpass unity and energy consumption of 168 KW-h m−3, at Re =109. The mineralization of vinasse indicates that such degradation occurs via hydroxyl radicals formed by the oxidation of water on the BDD surface. Experimental data revealed that hydrodynamic conditions slightly influence the vinasse degradation rate and current efficiency, indicating that the oxidation involves a complex pathway.

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