Electrochemical Oxidation of Organic Compounds Using Boron-Doped Diamond Electrode

Abstract

This paper presents the application of a boron-doped diamond (BDD) electrode in the electrochemical oxidation of stable organic compounds. The BDD electrode exhibits a high anodic potential, generating high oxidation state radicals that facilitate the oxidation of tough organic compounds. In this study, the electrochemical oxidation approach is tested in the cleaning of residual organics left on a liquid crystal display (LCD) device. Results indicate that residual organic compounds adhered on an LCD device are decomposed completely in the experiment. It has been shown that the electrolyte temperature and normalK3PnormalO4 concentration strongly affect the oxidation of tough residual organics such as phenylcyclohexane. Optimal cleaning performance is obtained at an electrolyte concentration of 0.4M normalK3PnormalO4 and a temperature between 50 and 70°C . The stability test of a BDD electrode measured by means of X-ray diffraction indicates that the BDD electrode remains unchanged after 200h of operation. Moreover, the electrochemical oxidation technique has dramatically minimized the use of the ozone depleting substance commonly used as the organic solvent in the LCD manufacturing process.

Electrochemical Degradation of Triclosan at a Ti/SnO2‐Sb/Ce‐PbO2 Anode

“…Micropores are also observable at inter grain (microcrystal) spaces. The observed surface features are similar to those already reported in the literature with regard to BDD electrodes [39,40]. Besides, the Ti/SnO 2 -Sb/Ce-PbO 2 electrode showed high oxygen evolution over-potential of 1.68 V versus Ag/AgCl as measured by linear sweep voltammetry technique.…”

Electrochemical oxidation of synthetic tannery wastewater in chloride-free aqueous media

“…(10)) and O 3 (Eq. (11)) can be electrogenerated on the Si/BDD electrode, mainly at high current densities [9,12,25]. H 2 O 2 and O 3 are not able to efficiently oxidize many organic compounds, and the oxidation process via these species is only efficient when combined with UV radiation and/or Fe 2+ because, in these cases, hydroxyl radicals are produced [26,27].…”

“…These radicals are able to promote the complete mineralization of organic compounds. Electrooxidation via HO • radicals is usually referred as direct because their lifetime is very short (<1 s), so the oxidation takes place at the electrode boundary layer or very close to it, even when these radicals are weakly adsorbed on the electrode (quasi free radicals) [10][11][12]. It has been reported that tannery wastewaters usually present high chloride concentrations in their compositions (1500-28,000 mg L −1 ) [13,14].…”

Research trends in electrochemical technology for water and wastewater treatment

“…Electrooxidation, which was extensively investigated since the late 1970s (Mayeda et al 1972;Nilsson et al 1973), had been used worldwide in various refractory wastewater treatments, such as textile wastewater (Andrade et al 2007), olive mill wastewater (Un et al 2008), distillery industry wastewater (Piya-Areetham et al 2006), dye-containing wastewater (Valero et al 2010), brown-colored molasses wastewater (Canizares et al 2008), and coking wastewater (Zhu et al 2009). Recently, researchers have paid more concern on anodic material of electrodes and its electrochemical performance and degradation mechanism (Marselli et al 2003;Chen 2004;Chang et al 2009). The common electrodes (Gao et al 1994;Chen 2004;Martinez-Huitle and Ferro 2006;Anglada et al 2009;Zhu et al 2009), such as, graphite, Pt, PbO 2 , SnO 2, Ti/Pt, Ti/SnO 2 , Ti/PbO 2 , Ti/RuO 2 -TiO 2 , Ti/IrO 2 -TiO 2 , Ti/IrO 2 -RuO 2 -TiO 2 , boron-doped diamond electrode (BDD), Titanium-based boron-doped diamond electrode (BDD/Ti) are usually found in the wastewater treatment field.…”