关键词: 电化学合成法, 高铁酸盐, 电解槽, 阳极材料, 工艺参数

Abstract: Ferrate is a recognized “green” chemical reagent，but high cost of potassium ferrate preparation greatly restricted its applications. Electrosynthesis method could become commercial technology of potassium ferrate preparation for its simple process and low consumption of raw materials. This paper reviewed the influencing factors of current efficiency and ferrate concentration from the view of electrolyzer structure，anode material composition，the component and concentration of electrolyte，current density，and the time of electrolysis. Small volume of anode chamber，appropriate increase of current density and electrolysis time can produce high concentration of ferrate. Anode materials containing carbon and silicon，and large surface area，such as cast iron，have higher activity than pure iron. Inert electrode developed in research may be worth of further investigation. Using sodium hydroxide as electrolyte at the concentration of 14mol/L，higher current efficiency can be obtained. Adding certain types of oxidants and corrosive ions in the electrolyte could help to alleviate the passivation and stable the ferrate. Employing alternating-current superimposed on direct-current can ease passivation of anode. Future research should focus on new electrolyzer structure and new process to reduce power consumption and electrolyte concentration，to achieve the final goal of continuous high concentration of potassium ferrate.

Key words: electrosynthesis, ferrate, electrolyzer, anode material, process parameters