Parametric Investigation of Electrochemical Synthesis of Ammonium Persulfate in Flow Reactor

The current work focuses on the process parameters to enhance the current efficiency for the electrosynthesis of ammonium persulfate (APS) in a flow reactor under acidic environments using platinized titanium (Pt–Ti) as an anode. The effect of flow rate, current density, material of cathode, and separators on current efficiency for the preparation of persulfate is studied. Ammonium persulfate is produced by the reactor with a yield of 98.3% and a concentration of 100.32 g L –1 , indicating the effective performance of the proposed system. A maximum current efficiency of 74.9% is achieved, corresponding to the energy consumption of 2.9 kWh kg –1 of ammonium persulfate using SS 304 and Daramic HD as cathode and separator, respectively. The impact of electrolyte composition on oxygen evolution reaction and hydrogen evolution reaction is investigated using linear sweep voltammetry. This selective cathode material and separator used in this flow system not only improve the yield and energy efficiency of ammonium persulfate production but also establish a scalable and sustainable method suitable for industrial applications.