摘要
采用一种新的铁电极材料制备高铁酸钾,探讨了电解材料、电流密度、电解时间对电流效率的影响,最佳工艺条件为:16mol/L NaOH,J=100mA/cm2,温度35℃,电解时间2.5h,高铁酸根物质的量浓度可达0.2869mol/L。初步研究了该反应的机理,结果表明此铁电极的循环伏安曲线与文献显著不同,尤其在-100mV(vs.HgO/Hg)附近出现明显的阳极氧化峰,可能是Fe(Ⅲ)向Fe(Ⅵ)转化的中间产物FeO34-[Fe(Ⅴ)],此反应加速了Fe(Ⅵ)的生成,提高了高铁酸钾的时空效率。用XRD对高铁酸钾进行了表征,在2θ为30°的位置出现最强的衍射峰,衍射强度为670。
In this study it reported an electrochemical generation of ferrate by dissolution of a new material. It discussed the influence of current density, electrolysis time and anode material on current efficiency. A ferrate solution about 286.87 moL/dm^3 was obtained under the optimum conditions： 16moL/L NaOH,J = 100mA/cm^2, 35℃, electrolysis duration （ 2.5h ）. The cyclic vohammograms （ CVs） of iron revealed a new anodic wave between - 1.4 and 0.7V versus HgO/Hg corresponding to ferrate（ Ⅵ） production. The CV is strikingly different in that anodic wave with previous papers, where was emerging the peak which was related to the inter-mediator of electro-oxidation of Fe （ Ⅲ） species in concentration basic aqueous solution. It should be FeO4^3 - （ Fe （ Ⅴ） species ）. The crystalline structure and morphology of particles of the samples are investigated by X-ray diffraction （ XRD）
出处
《表面技术》
EI
CAS
CSCD
2007年第6期53-55,58,共4页
Surface Technology
关键词
高铁酸钾
电化学合成
阳极材料
电流密度
Potassium ferrate
Electrochemical synthesis
Anode material
Current density
