Toward a Green Generation of Oxidant on Demand - Practical Electrosynthesis of Ammonium Persulfate
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2016-02-19 |
| Journal | ACS Sustainable Chemistry & Engineering |
| Authors | Ju Zhu, King Kuok Hii, Klaus Hellgardt |
| Institutions | Imperial College London |
| Citations | 54 |
Abstract
Section titled āAbstractāThe electrolysis of aqueous solution of ammonium sulfate has been systematically investigated in a two-compartment electrolytic flow cell for the potential applications for green and efficient synthesis of ammonium persulfate. A commercial boron-doped diamond (BDD) coated anode (active area of 10 cm2) was used and electrolysis was operated under batch recirculation. Under a flow rate of 3.33 mL min-1, the flow pattern is well described by a flow model with axial dispersion in the reaction compartment. The electrosynthesis was found not to be mass transport-limited in the present system at flow rates of ā„50 mL min-1 with a current density of ā¤150 mA cm-2. The charge transfer-controlled reaction was subsequently modeled, taking into account bubble coverage effects. Thereafter, the productivity of persulfate was investigated under different current densities, electrolyte compositions and concentrations. It was found that a high current efficiency can be obtained at the initial stage (ā¼93%, 150 mA cm-2, ā¤1 h), which deteriorated with time. By altering the volume and concentration of the anolyte, up to 1.31 M (150 mA cm-2, 3 h) of oxidant solution can be delivered for on-demand applications. The hydrogen of high purity was produced as a valuable byproduct of the process.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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