H₂O₂ determination at iron-rich clay modified electrodes

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• 作者：Khaled Charradi ; Chantal Gondran ; Abdesslem Ben Haj Amara ; Vanessa Pré ; vot ; Christine Mousty
• 关键词：Clay modified electrode ; Hydrogen peroxide ; Hemoglobin ; Methyl viologen ; Structural iron ; Amperometric sensors
• 刊名：Electrochimica Acta
• 出版年：2009
• 出版时间：1 July 2009
• 年：2009
• 卷：54
• 期：17
• 页码：4237-4244
• 全文大小：786 K

文摘

The electrochemical properties of natural or synthetic ferruginous clays, nontronite, montmorillonite and saponite, were studied by cyclic voltammetry and impedancemetry. Clay modified electrodes were then tested for the reduction of hydrogen peroxide under different conditions: in acidic medium without redox mediator, in phosphate buffer solutions (pH 7 or 8) with a redox cation (methyl viologen, MV²⁺) or a biomolecule (hemoglobin, Hb) absorbed within the clay coating. In all cases, the presence of iron species in the octahedral lattice of the clays enhanced the electrocatalytic reduction currents of H₂O₂. The sensitivities of H₂O₂ calibration curves were 0.23, 54 and 132 mA/M cm² for Nont, MV²⁺-Nont and Hb-Nont modified electrodes, respectively.