Exploration of MnO₂/carbon composites and their application to simultaneous electroanalytical determination of Pb(II) and Cd(II)

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• 作者：Mirjana Mali&scaron ; i膰^a ; Aleksandra Jano&scaron ; evi膰^b ; Biljana &Scaron ; ljuki膰 Paunkovi膰^a ; ^{biljana.sljukic@gmail.com} ; ^{biljka@ffh.bg.ac.rs} ; Ivana Stojkovi膰^a ; Gordana 膯iri膰-Marjanovi膰^a
• 关键词：Manganese dioxide ; Low-temperature wet impregnation procedure ; Hydrothermal procedure ; Lead ions ; Cadmium ions
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：15 July, 2012
• 卷：74
• 期：Complete
• 页码：158-164
• 文件大小：975 K

摘要

We report preparation of MnO₂ composites with carbon (Vulcan, graphite, and carbonized nanostructured polyaniline 5-sulfosalicylate) via hydrothermal and low-temperature wet impregnation procedure. All prepared composites were characterized using thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and conductivity measurements, and their characteristics compared. Furthermore, novel micro/nanostructured manganese dioxide/carbon composite based electrodes were tested for simultaneous determination of Pb²⁺ and Cd²⁺ as model analytes by anodic stripping voltammetry. The oxidation of the targeted heavy metals at the investigated composite electrodes gave distinctive and well separated peaks with lowest detection limits of 27 nM for Pb²⁺ and 52 nM for Cd²⁺ ions obtained with hydrothermally prepared MnO₂/graphite composite based electrode.