Comparative study of biogenic and abiotic iron-containing materials

被引：3
|
作者：
Cherkezova-Zheleva, Z. [1 ]
Shopska, M. [1 ]
Paneva, D. [1 ]
Kovacheva, D. [2 ]
Kadinov, G. [1 ]
Mitov, I. [1 ]
机构：
[1] Bulgarian Acad Sci, Inst Catalysis, Acad G Bonchev Str,Bldg 11, BU-1113 Sofia, Bulgaria
[2] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, Acad G Bonchev Str,Bldg 11, BU-1113 Sofia, Bulgaria
来源：
HYPERFINE INTERACTIONS | 2016年 / 237卷
关键词：
Biogenic nanosized iron oxides; Leptothrix genus of bacteria; Mossbauer spectroscopy; X-ray diffraction; IR spectroscopy; FT-IR; LEPIDOCROCITE; MOSSBAUER; BACTERIA; SPECTRA; OXIDES;
D O I：
10.1007/s10751-016-1257-x
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
Series of iron-based biogenic materials prepared by cultivation of Leptothrix group of bacteria in different feeding media (Sphaerotilus-Leptothrix group of bacteria isolation medium, Adler, Lieske and silicon-iron-glucose-peptone) were studied. Control samples were obtained in the same conditions and procedures but the nutrition media were not infected with bacteria, i.e. they were sterile. Room and low temperature Mossbauer spectroscopy, powder X-ray diffraction (XRD), and infrared spectroscopy (IRS) were used to reveal the composition and physicochemical properties of biomass and respective control samples. Comparative analysis showed differences in their composition and dispersity of present phases. Sample composition included different ratio of nanodimensional iron oxyhydroxide and oxide phases. Relaxation phenomena such as superparamagnetism or collective magnetic excitation behaviour were registered for some of them. The experimental data showed that the biogenic materials were enriched in oxyhydroxides of high dispersion. Catalytic behaviour of a selected biomass and abiotic material were studied in the reaction of CO oxidation. In situ diffuse-reflectance (DR) IRS was used to monitor the phase transformations in the biomass and CO conversion.
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页数：13
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