A membrane-based electrochemical flow reactor for generation of ferrates at near neutral pH conditions
Literature Information
Publication Date
2019-03-11
DOI
10.1039/C8RE00306H
Impact Factor
4.239
Authors
Macarena A. Cataldo-Hernández, Arman Bonakdarpour, Joseph T. English, Madjid Mohseni, David P. Wilkinson
View Original
Abstract
We report the electrosynthesis of Fe(VI) in a flow reactor operating in batch recirculation mode at neutral conditions using boron doped diamond (BDD) and Fe(III). The impact of several variables including current density (5–15 mA cm−2), pH (5–9), temperature (15–30 °C), and the concentration of the dissolved iron salts (3–30 mM) on the production of ferrates in the reactor were examined. In addition, the impact of a membrane in the reactor was evaluated, showing an increase on Fe(VI) generation rate and current efficiency. The rate constants for ferrate generation are affected by the initial concentration of Fe(III) and current density, and to a lesser extent by the temperature. Results show that the use of this type of reactor leads to higher current efficiency in comparison with a batch reactor, exceeding 90% for the first 25 minutes using 30 mM of Fe(III) and 10 mA cm−2. The recirculating reactor results were successfully interpreted by a simple model which considered first-order kinetics for Fe(VI) degradation.
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Source Journal
Reaction Chemistry & Engineering
CiteScore:
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8.8%
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Reaction Chemistry & Engineering is an interdisciplinary journal reporting cutting-edge research focused on enhancing the understanding and efficiency of reactions. Reaction engineering leverages the interface where fundamental molecular chemistry meets chemical engineering and technology. Challenges in chemistry can be overcome by the application of new technologies, while engineers may find improved solutions for process development from the latest developments in reaction chemistry. Reaction Chemistry & Engineering is a unique forum for researchers whose interests span the broad areas of chemical engineering and chemical sciences to come together in solving problems of importance to wider society. All papers should be written to be approachable by readers across the engineering and chemical sciences. Papers that consider multiple scales, from the laboratory up to and including plant scale, are particularly encouraged.
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