浓碱溶液中生成高铁酸盐的玻碳电极循环伏安法表征(英文)  

Indication of Ferrate(Ⅵ) Formation by Cyclic Voltammetry at Glassy Carbon Electrode in Concentrated Alkaline Solution

作　　者：杨长春[1] 李海霞[1] 石秋芝[1] 高杰[1] 丁哲[1] 吴强[1] 

机构地区：[1]郑州大学化学系,郑州450052

出　　处：《化学研究》2003年第4期7-11,15,共6页Chemical Research

基　　金：SuppportedbyZhengzhouUniversity"2 11"emphasisconstructionfoundation .

摘　　要：用玻碳电极研究了与Fe(Ⅵ)／Fe(Ⅲ)电对氧化还原有关的循环伏安曲线.所研究的体系是13mol·L-1NaOH中浓度范围分别为0.015～0.06mol·L-1的Na2FeO4和0.01～0.025mol·L-1的NaFeO2溶液。另一类研究体系是胶体石墨分别与固体K2FeO4、固体KFeO2组成的混合物,将这些混合物粘附于玻碳电极表面后在13mol·L-1KOH中进行循环伏安曲线的测定。结果证明了峰电位在0.7～1.0V的阳极电流峰与峰电位在0.15～0.2V(均相对于13mol·L-1NaOH或13mol·L-1KOH溶液中的Hg／HgO参比电极)的阴极电流峰,分别与高铁酸盐的生成与还原相对应。确定了将高铁酸盐的阳极生成电流峰与阳极析氧电流峰区别开来的条件。Cyclic voltammetry (CV) curves for the redox couple of Fe(Ⅵ)/Fe(Ⅲ) were measured using stationary glassy carbon (GC) electrode. The solutions of Na_2FeO_4 and NaFeO_2 in concentration range of 0.015～0.06 and 0.01～0.025 mol·L^(-1) respectively, in 13 mol·L^(-1) NaOH, and the mixtures of solid K_2FeO_4 or solid KFeO_2 and colloidal graphite, adhered to the surface of the GC electrode, in 13 mol·L^(-1) KOH, were studied. The anodic current peak at 0.7～1.0 V and the cathodic current peak at 0.15-0.2 V vs. Hg/HgO(13 mol·L^(-1) NaOH or KOH) were proved to be correspond to the formation and to the reduction of Fe(Ⅵ) respectively. The experimental conditions for separating the anodic current corresponding to the formation of Fe(Ⅵ) and that to the evolution of oxygen were determined.

关 键 词：浓碱溶液 高铁酸盐 玻碳电极 循环伏安法 表征 六价铁酸盐 三价铁酸盐 阳极电流峰 

分 类 号：O614.811[理学—无机化学] O657.1[理学—化学]