Abstract
The influence of different supporting electrolytes as well as of different current densities on RO16 dye electrochemical oxidation using BDD electrodes has been systematically studied. The RO16 azo-dye electrooxidation experiments were performed at different current densities and three different supporting electrolytes: H2SO4 0.1 mol L-1, HClO4 0.1 mol L-1 and K2SO4 0.1 mol L-1. The results showed that a higher degradation for reactive azo dye RO16 was observed for the K2SO4 (pH=10) supporting electrolyte for a current density of 100 mA cm-2. This behavior can be associated with the deprotonation effect of the dye molecule, which can facilitate breakdown of the molecule, specifically the azo bond making color removal more efficient. In addition, in this pH there is a greater amount of hydroxyl ion (OH-) available increasing the hydroxyl radical formation.
Highlights
Large amounts of different dyes are usually used in the textile industry
The boron-doped diamond (BDD) based anode is a new electrode material which has received great attention in the field of wastewater treatment for its wide potential window, low background current, very low activity for O2 evolution reaction and high anodic potential[16]. Another advantage of using BDD electrodes for organic degradation is related to their inertness, which prevents some undesirable by-products or products that would be strongly adsorbed on Influence of Supporting Electrolytes on Ro 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes the anode surface
Thereby, this paper aims at evaluating the influence of supporting electrolyte in the electrochemical degradation of Reactive Orange 16 (RO16) dye using BDD grown on titanium substrate (BDD/Ti)
Summary
Large amounts of different dyes are usually used in the textile industry. The textile wastewaters have characteristics such as strong color, large number of suspended solids, fluctuating pH, high chemical oxygen demand (COD), and biological toxicity[1]. The BDD based anode is a new electrode material which has received great attention in the field of wastewater treatment for its wide potential window, low background current, very low activity for O2 evolution reaction and high anodic potential[16] Another advantage of using BDD electrodes for organic degradation is related to their inertness, which prevents some undesirable by-products or products that would be strongly adsorbed on Influence of Supporting Electrolytes on Ro 16 Dye Electrochemical Oxidation Using Boron Doped Diamond Electrodes the anode surface. Our research group has published papers about organic compounds electrooxidation, especially textile dyes, for instance, a paper about Reactive Orange 16 (RO16) dye degradation using different BDD electrodes (acceptor concentrations of 4.0 and 8.0 × 1021 atoms cm−3) We noticed that both BDD electrodes presented efficiency and high stability in acidic medium[20]. The results were analyzed using analytical techniques such as UV-VIS spectroscopy, high-pressure liquid chromatography (HPLC) and total organic carbon (TOC) analyses
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