Permanganate formation in the reactions of ozone with Mn(II): a mechanistic study

Research Article| September 01 2008 Permanganate formation in the reactions of ozone with Mn(II): a mechanistic study Erika Reisz; Erika Reisz 1University "Politehnica" of Timişoara, Bulevardul Victoriei 2, 300006 Timişoara, Romania Search for other works by this author on: This Site PubMed Google Scholar Achim Leitzke; Achim Leitzke 2Max-Planck-Institut für Bioanorganische Chemie, Stiftstr. 34-36, P. O. Box 101365, 45470 Mülheim an der Ruhr, Germany Search for other works by this author on: This Site PubMed Google Scholar Alexandra Jarocki; Alexandra Jarocki 3Universität Duisburg-Essen, Fachgebiet Instrumentelle Analytische Chemie, Lotharstr. 1, 47048 Duisburg, Germany Search for other works by this author on: This Site PubMed Google Scholar Rudolf Irmscher; Rudolf Irmscher 4Stadtwerke Düsseldorf AG, Höherweg 100, 40233 Düsseldorf, Germany Search for other works by this author on: This Site PubMed Google Scholar Clemens von Sonntag Clemens von Sonntag 2Max-Planck-Institut für Bioanorganische Chemie, Stiftstr. 34-36, P. O. Box 101365, 45470 Mülheim an der Ruhr, Germany Tel.: +49-208-31806; E-mail: clemens@vonsonntag.de Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2008) 57 (6): 451–464. https://doi.org/10.2166/aqua.2008.091 Article history Received: October 03 2007 Accepted: January 18 2008 Views Icon Views Article contents Figures Permanganate formation in the reactions of ozone with Mn(II): a mechanistic study. Journal of Water Supply: Research and Technology-Aqua 1 September 2008; 57 (6): 451–464. doi: https://doi.org/10.2166/aqua.2008.091 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Ozone treatment of Mn2 + -containing waters is reported to lead to MnO4− formation. This complex reaction is investigated on the model level. In neutral solution, the main product is MnO2 and only 10% MnO4− are formed even at high ozone excess. In acid solution, however, or in neutral solution when Mn2 + is complexed by polyphosphate, oxalate, sulfate, bicarbonate or phosphate, the reaction proceeds to MnO4− in an up to 100% yield. In this reaction, three-times more O3 is consumed than stoichiometrically required indicating that higher manganese oxidations states can also be reduced by O3 (e.g., MnO2 + + O3→Mn2 + + 2O2). In acid solution or in the presence of a complexing agent and with Mn(II) in excess, Mn(III) is formed by conproportionation of Mn(II) with Mn(IV). Mn2 + -containing waters are accompanied by Fe2 + that also induces MnO4− formation. Fe2 + reacts 650-times faster with O3 than Mn2 + , and the oxidation of Mn2 + by Fe(IV) to Mn(III) can circumvent MnO2 formation. Mn(III) can then be oxidized to MnO4−. The thermodynamics of the suggested reactions is discussed. The MnO4− formation in drinking water and wastewater is most likely due to the presence of Fe2 + in these waters rather than due to complexation of Mn2 + by NOM or inorganics. iron, manganese, oxalate, ozone, permanganate, polyphosphate This content is only available as a PDF. © IWA Publishing 2008 You do not currently have access to this content.