Toward a Green Generation of Oxidant on Demand: Practical Electrosynthesis of Ammonium Persulfate
Toward a Green Generation of Oxidant on Demand: Practical Electrosynthesis of Ammonium Persulfate
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DOI：
10.1021/acssuschemeng.5b01372
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发表时间：
2016-02
影响因子：
8.4
通讯作者：
Junyan Zhu;K. K. Hii-K.;K. Hellgardt
中科院分区：
文献类型：
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作者：
Junyan Zhu;K. K. Hii-K.;K. Hellgardt
为实现绿色高效合成过硫酸铵，在双室电解液流动池中对硫酸铵水溶液的电解过程进行了系统的研究。使用商业硼掺杂金刚石（BDD）涂覆的阳极（活性面积为10 cm 2），并且电解在批量再循环下操作。在3.33 mL min-1的流速下，反应室中的流动模式由具有轴向分散的流动模型很好地描述。在电流密度≤150 mA cm-2、流速≥50 mL min-1的本系统中，发现电合成不受传质限制。电荷转移控制的反应随后建模，考虑到气泡覆盖效应。在此基础上，研究了不同电流密度、电解液组成和浓度下过硫酸盐的产率。实验结果表明，在初始阶段，电流效率可达93%左右（150 mA cm-2，≤1 h）。
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)...