Preparation of Bi sub(2)Fe sub(4)O sub(9) particles by hydrothermal synthesis and functional properties

In the present study, particles with different Bi sub(2)Fe sub(4)O sub(9) micro/nanostructures with a few particular morphologies (flower-like nanoplatelets, hierarchical microstructures, perfectly square platelets single crystals, etc.) obtained under specific hydrothermal synthesis conditions were...

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Bibliographic Details
Published in:Phase transitions 2013-07, Vol.86 (7), p.726-736
Main Authors: Gheorghiu, Felicia, Tanasa, Radu, Buscaglia, Maria Teresa, Buscaglia, Vincenzo, Pastravanu, Cristina G, Popovici, Eveline, Mitoseriu, Liliana
Format: Article
Language:English
Subjects:
Magnetic properties
Microstructure
Morphology
Nanocomposites
Nanomaterials
Nanostructure
Photocatalysis
Synthesis
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Summary:In the present study, particles with different Bi sub(2)Fe sub(4)O sub(9) micro/nanostructures with a few particular morphologies (flower-like nanoplatelets, hierarchical microstructures, perfectly square platelets single crystals, etc.) obtained under specific hydrothermal synthesis conditions were investigated. The role of the processing parameters (such as NaOH concentration, reaction temperature, and reaction duration time) on the phase formation mechanism and on the microstructural characteristics was investigated. All the Bi sub(2)Fe sub(4)O sub(9) morphologies showed orthorhombic symmetry with space group Pbam. The photocatalytic properties and magnetic behavior as a function of the micro/nanostructural characteristics of various Bi sub(2)Fe sub(4)O sub(9) powders were determined. In the presence of Bi sub(2)Fe sub(4)O sub(9), a degradation rate of Rose Bengal in the range of 52-61% was determined after 180 min under UV light irradiation ( lambda = 254 nm). Magnetic activity with antiferromagnetic behavior and a transition at similar to 240 K slightly dependent on the microstructures was found. The role of Bi sub(2)Fe sub(4)O sub(9) microstructures in the photocatalytic activity and magnetic properties was discussed.
ISSN:0141-1594
1029-0338
DOI:10.1080/01411594.2012.741238