Electrosynthesis of ferrate in a batch reactor at neutral conditions for drinking water applications
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-01-17 |
| Journal | The Canadian Journal of Chemical Engineering |
| Authors | Macarena A. CataldoāHernĆ”ndez, Rubenthran Govindarajan, Arman Bonakdarpour, Madjid Mohseni, David P. Wilkinson |
| Institutions | University of British Columbia |
| Citations | 20 |
Abstract
Section titled āAbstractāAbstract We report on the electrochemical generation of ferrate species in a batch reactor at neutral conditions (pH ā¼7) using boronādoped diamond (BDD) electrodes and Fe (III) salts for applications in drinking water treatment. The impact of several relevant variables, including current density (5-55 mA cm ā2 ), pH (5-8), and type and concentration of the dissolved iron salts on the production of ferrates were examined. In addition, linear sweep voltammetry (LSV) studies were conducted using buffered electrolytes with and without the presence of iron (III) to decouple the parasitic oxygen evolution reaction. The LSV measurements in the presence of iron (III) and with a neutral electrolyte exhibit oxidation peaks centered ā¼2.0 V (versus SHE), indicating the production of ferrates at this pH. The rate of ferrate generation is not strongly affected by the pH condition (ā¤ 20 %); however, current density and the source of iron were found to have a higher impact on the production rate of ferrates. The efficacy of the process was higher using FeCl 3 instead of other sources of iron such as Fe 2 O 3 and FeO(OH). The batch reactor results were successfully interpreted by a simple model that considered the kinetics of the ferrate generation and degradation reactions.