Effect of selected metal ions on the photocatalytic degradation of bog lake water natural organic matter |
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Authors: | Espinoza Luis A Tercero ter Haseborg Eike Weber Matthias Karle Elly Peschke Rafael Frimmel Fritz H |
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Affiliation: | Water Chemistry, Engler-Bunte-Institut, Karlsruhe Institute of Technology, Engler-Bunte-Ring 1, 76131 Karlsruhe, Germany |
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Abstract: | Herein we report the photocatalytic degradation of natural organic matter from a bog lake (Lake Hohloh, Black Forest, Germany) in the presence of 0, 5, and 10 μmol L−1 of added Cu2+, Mn2+, Zn2+ and Fe3+. The reactions were followed by size exclusion chromatography with organic carbon detection (SEC-DOC) and by measurements of low molecular weight organic acids. Addition of Cu2+ had the largest effect of all four studied metals, leading to a retardation in the molecular size changes in NOM: degradation of the larger molecular weight fraction was inhibited leading to reduced production of smaller molecular weight metabolites. Similarly, addition of Cu2+ reduced the production of formic and oxalic acids, and reduced the bioavailability of the partially degraded NOM. |
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Keywords: | Heterogeneous photocatalysis Natural organic matter Size exclusion chromatography Low molecular weight organic acids Degradation |
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