Electrochemical incineration of dimethyl phthalate by anodic oxidation with boron-doped diamond electrode

Abstract

The anodic oxidation of aqueous solutions containing dimethyl phthalate (DMP) up to 125 mg/L with sodium sulfate (Na 2 SO 4 ) as supporting electrolyte within the pH range 2.0-10.0 was studied using a one-compartment batch reactor employing a boron-doped diamond (BDD) as anode. Electrolyses were carried out at constant current density (1.5-4.5 mA/cm 2 ). Complete mineralization was always achieved owing to the great concentration of hydroxyl radical ( . OH) generated at the BDD surface. The effects of pH, apparent current density and initial DMP concentration on the degradation rate of DMP, the specific charge required for its total mineralization and mineralization current efficiency were investigated systematically. The mineralization rate of DMP was found to be pH-independent and to increase with increasing applied current density. Results indicated that this electrochemical process was subjected, at least partially, to the mass transfer of organics onto the BDD surface. Kinetic analysis of the temporal change of DMP concentration during electrolysis determined by High Performance Liquid Chromatography (HPLC) revealed that DMP decay under all tested conditions followed a pseudo first-order reaction. Aromatic intermediates and generated carboxylic acids were identified by Gas ChromatographyMass Spectrometry (GC-MS) and a general pathway for the electrochemical incineration of DMP on BDD was proposed.

Electrochemical Deposition of Lead Dioxide Nanostructured Thin Films

“…1, SEM images of PbO 2 synthesized by anodic electrochemical deposition on Au/Ti/Si substrates are shown. The applied potential, deposition time and solution pH were 1.3 V, 9 minutes and ~2.0 respectively, and the concentration of source materials, HNO 3 and PbCl 2 , were 14 mM and 5 mM, respectively. Figs.…”

“…4. The deposition time was 30 min, and the concentrations of source materials, HNO 3 and PbCl 2 , were 14 mM and 5mM, respectively. Different values for the applied potential were used: 1.1V for Fig.…”

“…Electrochemical oxidation is a promising technique that can be used for the electrochemical incineration of wastewaters, and has been intensively studied recently [1][2][3][4][5][6][7][8] . One of the most important requirements for electrochemical oxidation is finding a suitable electrode material.…”

Application of porous boron-doped diamond electrode towards electrochemical mineralization of triphenylmethane dye

“…Complete decolorization and mineralization [16] could be realized on BDD electrode and the both progresses become slower when employing Pt or DSA electrodes as anodes. Especially, the superior features of high oxygen evolution potential and high stability endow the BDD electrode with potential widely electrochemical application in wastewater treatment.BDD electrode is regarded as the best known material for electrochemical oxidation [17][18][19], and the degradation of different pollutants has been conducted on BDD electrode including phenols, surfactants, antibiotics and medical intermediate, pesticides, pigment and dyes, and so on.…”

Preparation and enhanced daylight-induced photo-catalytic activity of transparent C-Doped TiO2 thin films

“…Fortunately, recent study has revealed that the shortcomings of TiO 2 can be overcome by doping it with some nonmetallic elements such as N, F, S, C, B. These nonmetal elements have been proved to be beneficial doping elements in the TiO 2 through mixing their p orbital with O2p orbital to reduce the band gap energy of TiO 2 [5][6][7][8][9] . Undeniably, the modification of TiO 2 photocatalysts involves the doping with nonmetal elements resulting in a desired band-gap narrowing and an enhancement in the photocatalytic efficiency under daylight-inducing.…”