应用电解法,并于阳极电解液中分别加入KIO4等不同种类添加剂制备K2FeO4,考察添加剂对电流效率以及FeO42-稳定性的影响规律,产品K2FeO4的结构形貌由XRD、SEM表征.结果表明,KIO4是比较理想的添加剂,在阳极液中添加质量比为0.02%的KIO4,电解1h后,电流效率可提高31.6%,K2FeO4产品的纯度相应提高了3.85%.
Some of different additions including KIO4 was added to the anodic electrolyte for electrochemical synthesizing of K2FeO4,the effects of these additions on current yield were investigated.XRD and SEM were used to characterize the structure and image of K2FeO4.The results show that KIO4 is a preferable addition.When the mass dosage of KIO4 is 0.02%,electrolysis time is 1 h,the current yield is enhanced by 31.6% and the corresponding purity of the product is improved by 3.85 %.
[1]Jiang J Q,Barry L,Luminita Q.Preparation and evalu-ation of potassium ferrate as an oxidant and coagulant forpotable water treatment[J].Environmental EngineeringScience,2001,18:323.
[2]Delaude L,Laszlo P.A novel oxidizing reagent basedon potassium ferrate(VI)[J].Journal of OrganicChemistry,1996,61:6360.
[3]Mathieu D K,Daniel B.The electrochemical generationof ferrate at pressed iron powder electrode:comparisonwith a foil electrode[J].Electrochimica Acta,2003,48:1435.
[4]Karel B,Henry B.Comparison of pure and white castiron dissolution kinetics in highly alkaline electrolyte[J].Corrosion Science,1999,41:2113.
[5]Karel B,Martin J S,Anthony A W.Influence of anodematerial composition on the stability of electrochemical-ly-prepared Fe(VI)solutions[J].Chemical Technolo-gy Biotechnology,1999,74:1188.
[6]Xu J J(许家驹),Wang J M(王建明),Yang W H(杨卫华),et al.Electrochemical synthesis of ferrate(VI)by anodic oxidation[J].Electrochemistry(in Chinese)[J].2004,10(1):87.
[7]Gao X F,Li S H.The analysis of total iron of K2Cr2O7titration using Zn powders as reducer[J].MetallurgicalAnalysis,2000,20:48.
[8]Liu Y Z.Physical and chemical characters and impor-tant response equation handbook of inorganic matter[M].Chengdu:Scientific and Technical UniversityPublishing Press,1993.278.
[9]Licht S,Naschitz V,Halperin L,et al.Analysis of fer-rate(VI)compounds and super-iron Fe(VI)batterycathodes:FTIR,ICP,titrimetric,XRD,UV/VIS,andelectrochemical characterization[J].Journal of PowerSources,2001,101:167.
[10]Licht S,Naschitz V,Ghosh S,et al.SrFeO4:synthe-sis,Fe(VI)characterization and the strontium super-iron battery[J].Electrochemical Communications,2001,3:340.
