Design of Polymer-Embedded Heterogeneous Fenton Catalysts for the Conversion of Organic Trace Compounds

Advanced oxidation processes are the main way to remove persistent organic trace compounds from water. For these processes, heterogeneous Fenton catalysts with low iron leaching and high catalytic activity are required. Here, the preparation of such catalysts consisting of silica-supported iron oxid...

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Published inProcesses Vol. 9; no. 6; p. 942
Main Authors Horn, Christoph, Ihmann, Stephanie, Müller, Felix, Pospiech, Doris, Borchert, Konstantin B. L., Hommel, Rolf, Qin, Kaite, Licha, Kai, Allertz, Peter J., Drache, Marco
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2021
Subjects
Bisphenol A
Carcinogens
Catalysts
Catalytic activity
Conversion
Embedding
Ferric oxide
Hydrogen peroxide
Iron
Iron oxides
Leaching
Nonsteroidal anti-inflammatory drugs
Oxidation
Phenols
Polymer matrix composites
Polymers
Polypropylene
Silicon dioxide
Sol-gel processes
Spectrum analysis
Water treatment
Zeolites
United States > US
Germany
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Summary:Advanced oxidation processes are the main way to remove persistent organic trace compounds from water. For these processes, heterogeneous Fenton catalysts with low iron leaching and high catalytic activity are required. Here, the preparation of such catalysts consisting of silica-supported iron oxide (Fe2O3/SiOx) embedded in thermoplastic polymers is presented. The iron oxide catalysts are prepared by a facile sol–gel procedure followed by thermal annealing (calcination). These materials are mixed in a melt compounding process with modified polypropylenes to stabilize the Fe2O3 catalytic centers and to further reduce the iron leaching. The catalytic activity of the composites is analyzed by means of the Reactive Black 5 (RB5) assay, as well as by the conversion of phenol which is used as an example of an organic trace compound. It is demonstrated that embedding of silica-supported iron oxide in modified polypropylene turns the reaction order from pseudo-first order (found for Fe2O3/SiOx catalysts), which represents a mainly homogeneous Fenton reaction, to pseudo-zeroth order in the polymer composites, indicating a mainly heterogeneous, surface-diffusion-controlled process.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr9060942