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首页> 外文期刊>Electroanalysis >The electrochemical behavior of iron(III) incorporated in zeolite Y-modified electrode and the catalytic oxidation of ascorbic acid
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The electrochemical behavior of iron(III) incorporated in zeolite Y-modified electrode and the catalytic oxidation of ascorbic acid

机译：沸石Y修饰电极中铁（III）的电化学行为及抗坏血酸的催化氧化

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摘要

A new method is developed for the catalytic oxidation of ascorbic acid (AA) at a graphite-zeolite-modified electrode doped with iron(III) (Fe3+Y/ZCME), in which iron(III) exchanged in zeolite Y can act as catalyst to oxidize PLA. First, the electrochemical behavior of iron(III) incorporated in the zeolite Y-modified electrode was studied. The results illustrate that diffusion controls the ferric/ferrous redox process at the Fe3+Y/ZCME. The anodic current of this process increases with the supporting electrolyte concentration of non-size-excluded cation and was suppressed when using size-excluded cation. Second, the catalytic oxidation of AA was explored at Fe3+Y/ZCME. With constant potential amperometric measurements optimal conditions for AA determination were obtained. The working potential was 0.55 V (vs. SCE); the supporting electrolyte was 0.1 M KNO3 or 0.05 M Na2HPO4-KH2PO4 buffer solution (pH 6.8). The response current exhibits a linear relationship with the concentration of AA over the range of 1.58 x 10(-6)-2.15 x 10(-2) M. When samples of urine, and fruit were analyzed with Fe3+Y/ZCME, we obtained AA recovery of 98-102%, and a relative standard deviation lower than 3%. Meanwhile, interferences from other ions and organic substances were examined. [References: 28]
机译：开发了一种新的催化抗坏血酸（AA）在掺杂铁（III）（Fe3 + Y / ZCME）的石墨沸石修饰电极上催化氧化的方法，其中在沸石Y中交换的铁（III）可以用作氧化PLA的催化剂。首先，研究了掺入沸石Y修饰电极中的铁（III）的电化学行为。结果表明，扩散控制了Fe3 + Y / ZCME处的铁/亚铁氧化还原过程。该过程的阳极电流随着非尺寸排斥阳离子的支持电解质浓度而增加，并且在使用尺寸排斥阳离子时被抑制。其次，在Fe3 + Y / ZCME上探索了AA的催化氧化。使用恒定的电位安培测量，可获得确定AA的最佳条件。工作电位为0.55 V（vs. SCE）;支持电解质为0.1 M KNO3或0.05 M Na2HPO4-KH2PO4缓冲溶液（pH 6.8）。在1.58 x 10（-6）-2.15 x 10（-2）M范围内，响应电流与AA浓度呈线性关系。当用Fe3 + Y / ZCME分析尿液和水果时，我们获得的AA回收率为98-102％，相对标准偏差低于3％。同时，检查了来自其他离子和有机物质的干扰。 [参考：28]

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