Usage of anisomeric square pulse with fluctuating frequency for electrochemical generation of FeO42− in CS–CMC bipolar membrane electrolysis cell

The usage of anisomeric square pulse with fluctuating frequency for electrochemical generation of FeO42− has been reported. The cylinder electrolytic bath was constituted by a double cathode and a porous cast iron cylinder anode, using CS–CMC bipolar membrane as septum. Compared with CS or CMC membranes, CS–CMC BM has good mechanical strength and chemical stability in acid and alkali solution. FT-IR spectrum indicated that CS–CMC BM contained N CRH2+ and COO− functional groups. The charge density of N CRH2+ in CS layer and COO− in CMC layer was about 14.13 and 9.01 mmol/g, respectively. With the aid of anisomeric square pulse, the oxidation layer was destroyed in time. After 6 h electrolysis, the corresponding current efficiency was 51.2%.