Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2019-05-13 |
| Journal | ChemElectroChem |
| Authors | Vanessa M. Vasconcelos, Carlos Ponce de León, Stefan Rosiwal, Marcos R.V. Lanza |
| Institutions | University of Southampton, Friedrich-Alexander-Universität Erlangen-Nürnberg |
| Citations | 19 |
Abstract
Section titled “Abstract”Abstract Reactive Blue 19 (RB‐19) dye has a low fixation efficiency, a long half‐life and high toxicity. It is easily loss during the cleaning of textiles and can remain in the environment for a long time, causing serious environmental problems if not removed. This study reports the degradation of RB‐19 by: 1) direct electrochemical degradation with boron‐doped diamond (BDD) electrodes and 2) combined processes using BDD and reticulated vitreous carbon (RVC) electrodes that generate H 2 O 2 . The direct degradation uses different current densities and concentrations. High currents densities, longer electrolysis times and low volumetric flow rates favour RB‐19 degradation, removing total colour and 100 % TOC after 5 and 60 min, respectively. At a current density of 41 mA cm −2 and a volumetric flow rate of 20 dm 3 h −1 , the energy consumption to degrade 20 mg dm −3 of RB‐19 was 279 kWh kg −1 . The TOC removal of RB‐19 dye combining BDD and RVC at a current density of 41 mA cm −2 was below 72 % after 90 min and the energy consumption increased to 612 kWh kg −1 . The higher energy consumption observed during the combined process suggests that the direct degradation process at low volumetric flow rates is more efficient than the combined process.