Investigation of biogenic iron-containing nanoscale composite materials
| Autor: | Daniela Paneva, Zara Cherkezova-Zheleva, Mihail Iliev, Maya Shopska, Ralitsa Ilieva, G. Kadinov, Daniela Kovacheva |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Nuclear and High Energy Physics biology Silica gel Dispersity Iron oxide 02 engineering and technology 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology Condensed Matter Physics biology.organism_classification 01 natural sciences Atomic and Molecular Physics and Optics Catalysis chemistry.chemical_compound chemistry Transition metal Compounds of carbon Physical and Theoretical Chemistry Composite material 0210 nano-technology Leptothrix 0105 earth and related environmental sciences Biomineralization |
| Zdroj: | Hyperfine Interactions. 239 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/s10751-017-1480-0 |
| Popis: | Biogenic composites are interesting as green and sustainable precursors for preparation of advanced materials of various applications. Biomaterials from Leptothrix group bacteria cultivated in two feeding media of silicon-iron-glucose-peptone (SIGP) and Lieske were studied. Iron-containing biogenic powders and biofilms on silica gel covered aluminum plates were prepared. They were studied to elucidate the effect of the plates in the process of growing biogenic iron nanotubes. The cultivation period was varied from 4 to 30 days. Biomass phase composition and physicochemical properties were studied by Mossbauer spectroscopy at room and low temperature, as well as by means of powder XRD, FTIRS, and SEM methods. Mossbauer analysis offered us a unique possibility to register iron oxide species at the different steps of biogenic material formation. Tetrahedrally coordinated iron species were registered at an early stage of biofilm formation. So, important results on the mechanism of biomineralization process are obtained. The reaction of CO oxidation on prepared biomaterials was studied using in situ DRIFTS. Comparative analysis of the obtained materials and examination of spent samples showed differences in their phase composition, stability and dispersity. Changes of the phase composition were observed during catalytic tests with biomasses obtained in Lieske feeding media. No differences in biogenic powder and biofilm composition and dispersity were registered when SIGP media was used neither for studied bacteria cultivation period nor in spent catalysts. These results indicated the stabilizing effect of extra silicon content in the feeding media. Formation of iron oxihydroxide nanotubes was also established in this case. |
| Databáze: | OpenAIRE |
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