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.
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