Technique Of Ionic Exchange Membrane And Its Applications On Electrochemical Generation Of Pyridine-N-oxide And Ferrate

In a Nation cationic membrane electrolytic cell, pyridine-N-oxide waselectro-oxidized by the electro-generated MnO₂ under the ultrasonic waves; the optimizedconditions were also discussed. With the aid of ultrasonic waves, the electro-generatedMnO₂ granules reached to a nano-level and were dispersed equally in the solution ofanode-chamber, which would act as an oxidant in the electrosynthesis ofpyridine-N-oxide in the form of Mn²⁺/MnO₂. The results showed that 68.8 % electrolysesyield of pyridine-N-oxide and 76.4 % current efficiency were obtained, respectively.The usage of anisomerous square pulse with fluctuant frequency forelectro-generated FeO4₄^2- was inverstigated. The cylinder electrolytic bath was constitutedby double cathode and porous cylinder cast iron as anode, using CS-CMC bipolarmembrane as septum. With the aid of anisomerous square pulse, the oxidation layer onthe cast iron anode which was generated during the process of electrolysis wasdemolished in time. After 6-hour electrolysis at 2 Hz and 5 mA·cm^-2, 37.0 mmol·L^-1FeO₄^2- was generated and the corresponding current efficiency was 51.1%.Grafted SAMS onto CMC, SAMS-CMC-CS bipolar membrane was prepared andapplied to the electrochemical generation of FeO₄^2-. The information of cross-section inBM were studied by SEM. Compared with CMC-CS BM, SAMS-CMC-CS BM appeareda good mechanical strength and chemical stability in the alkali solution, as well as thecharge density. After 6-hour electrolysis at 2 Hz and 5 mA·cm^-2, 47.9 mmol·L^-2 FeO₄^2-was generated and the corresponding current efficiency was 64.1%.