Toward a Green Generation of Oxidant on Demand: Practical Electrosynthesis of Ammonium Persulfate
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- 作者：Ju Zhu ; King K. (Mimi) Hii ; Klaus Hellgardt
- 刊名：ACS Sustainable Chemistry & Engineering
- 出版年：2016
- 出版时间：April 4, 2016
- 年：2016
- 卷：4
- 期：4
- 页码：2027-2036
- 全文大小：527K
- ISSN：2168-0485
文摘
The 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 ≥50 mL min–1 with a current density of ≤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 (∼93%, 150 mA cm–2, ≤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.