高铁酸钾电化学合成及其机理研究

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.

The Electrochemical Preparation and Reaction Mechanism of Potassium Ferrate

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/dm3 was obtained under the optimum conditions : 16mol/L NaOH,J = lOOmA/cm2 , 35 0C , electrolysis duration ( 2. 5h) . The cyclic voltammograms ( 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 FeOj- ( Fe( V) species) . The crystalline structure and morphology of particles of the samples are investigated by X-ray diffraction ( XRD)