Izvorni znanstveni članak

https://doi.org/10.5562/cca2374

Treatment of Biogenic Iron-Containing Materials

Maya G. Shopska orcid.org/0000-0002-9714-2464 ; Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Zara P. Cherkezova-Zheleva ; Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Daniela G. Paneva ; Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Vilma Petkova ; Acad. Ivan Kostov Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Georgi B. Kadinov orcid.org/0000-0001-8604-7704 ; Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Ivan G. Mitov ; Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria

Sažetak

Biogenic iron oxides could find application in catalysis but their structure and composition should be well characterized. The content of organic rests due to their origin should also be controlled. Samples of natural biomass and biomass obtained after cultivation in Adler’s medium of the Sphaerotilus-Leptothrix group of bacteria were treated by different techniques to reduce or totally remove the organic residues. The aim of the study was to find procedures, which prevent changes in the oxidation state of the iron and of the type of iron-containing compound(s) during treatment. Mössbauer spectroscopy, IRS, DTA, and SEM were used in the study. Chemical treatment with H2O2 or NaOH at room temperature did not significantly change the samples. Thermal treatment in oxidative flow mixture conducted up to 250 °C resulted in a transformation of the iron-containing phases only. The organic matter, which is included in the structure of the particles, cannot easily be affected. DTA revealed that removal of organic rests
occurred in the interval of 250–600 °C. However, the transformation of the initial compounds could not be prevented using such a treatment.

Ključne riječi

inorganic compounds; Sphaerotilus-Leptothrix group of bacteria; Mössbauer spectroscopy; thermogravimetric analysis; Fourier transform infrared spectroscopy

Hrčak ID:

126971

URI

https://hrcak.srce.hr/126971

Datum izdavanja:

1.7.2014.

Posjeta: 1.951 *