Electrosynthesized iridium oxide-polymer nanocomposite thin films for electrocatalytic oxidation of arsenic(III)
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- 作者：Juan Francisco Rivera ; Isabelle Pignot-Paintr ; Eduardo Pereira ; Bernab茅 L. Rivas ; Jean-Claude Moutet
- 关键词：Iridium oxide composites ; Nanomaterials ; Electrocatalytic oxidation ; Arsenic ; Ultrafiltration
- 刊名：Electrochimica Acta
- 出版年：1 November, 2013
- 年：2013
- 卷：110
- 期：Complete
- 页码：465-473
- 全文大小：1759 K
文摘
Nanocomposite materials have been synthesized by electrodeposition of iridium oxide nanoparticles into poly(pyrrole-alkylammonium) films coated by oxidative electropolymerization of a pyrrole-alkylammonium monomer onto carbon electrodes, and characterized by electrochemistry in aqueous electrolytes and by transmission electron microscopy. Iridium oxide-based nanocomposite electrode materials appeared efficient electrocatalysts for the oxidation of arsenic(III) into arsenic(V) species at low potentials, i.e. in the 0.3-0.7 V vs. Ag/AgCl range, and over a large pH range. Bulk electrocatalytic oxidation of arsenite solutions could be performed in the presence of a water-soluble poly(quaternary ammonium) salt acting as the supporting electrolyte and also as an As(V) complexing agent, which allowed the combination of electrocatalytic oxidation of As(III) with the liquid phase polymer-assisted retention (LPR) technique to efficiently remove arsenic from polluted solutions.