The anodic mineralization/incineration of toxic organic substrates in aquatic media is an important goal in industrial electrochemistry, whose achievements in synthesis and energetics already greatly contribute to the reduction of the environmental impact in chemical production of goods and in energy conversion. Electrochemical incineration of organic pollutants can be attempted by direct or indirect oxidation. In the latter case anodically formed oxidants (Cl2, hypochlorite, peroxide, ozone, Fenton’s reagent, peroxodisulphate) react with organic substrates, eventually leading to their complete conversion to CO2, H2O and other inorganic components. In the indirect oxidation, also called mediated electrochemical oxidation (MEO), chloride mediation is of particular interest, because of the ubiquitous character of Cl- species in wastewaters, and because of their quite effective action. Anodic oxidation of organics in the presence of NaCl has been previously studied for the case of, e.g., bisphenol A, phenol and glucose. Aim of this work is to discuss the electrochemical oxidation of oxalic acid (OA) and tartaric acid (TA) analyzing the influence of NaCl and NaBr. Experiments were carried out at Pt electrodes, in alkaline media. The elimination rate of both carboxylic acids was found to depend on current density and nature of the halide, the latter playing a major role, as show in figure 1 in the case of TA.
Electrochemical incineration of tartaric acid. Role of the electrode material
MARTINEZ, Carlos Alberto;FERRO, Sergio;VAZQUEZ GOMEZ, Lourdes;DE BATTISTI, Achille
2004
Abstract
The anodic mineralization/incineration of toxic organic substrates in aquatic media is an important goal in industrial electrochemistry, whose achievements in synthesis and energetics already greatly contribute to the reduction of the environmental impact in chemical production of goods and in energy conversion. Electrochemical incineration of organic pollutants can be attempted by direct or indirect oxidation. In the latter case anodically formed oxidants (Cl2, hypochlorite, peroxide, ozone, Fenton’s reagent, peroxodisulphate) react with organic substrates, eventually leading to their complete conversion to CO2, H2O and other inorganic components. In the indirect oxidation, also called mediated electrochemical oxidation (MEO), chloride mediation is of particular interest, because of the ubiquitous character of Cl- species in wastewaters, and because of their quite effective action. Anodic oxidation of organics in the presence of NaCl has been previously studied for the case of, e.g., bisphenol A, phenol and glucose. Aim of this work is to discuss the electrochemical oxidation of oxalic acid (OA) and tartaric acid (TA) analyzing the influence of NaCl and NaBr. Experiments were carried out at Pt electrodes, in alkaline media. The elimination rate of both carboxylic acids was found to depend on current density and nature of the halide, the latter playing a major role, as show in figure 1 in the case of TA.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
