Controlled synthesis, magnetic and photocatalytic properties of hollow spheres and colloidal nanocrystal clusters of manganese ferrite

Guo, Peizhi, Zhang, Guoliang, Yu, Jianqiang, Li, Hongliang and Zhao, X. S. (2012) Controlled synthesis, magnetic and photocatalytic properties of hollow spheres and colloidal nanocrystal clusters of manganese ferrite. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 395 168-174. doi:10.1016/j.colsurfa.2011.12.027


Author Guo, Peizhi
Zhang, Guoliang
Yu, Jianqiang
Li, Hongliang
Zhao, X. S.
Title Controlled synthesis, magnetic and photocatalytic properties of hollow spheres and colloidal nanocrystal clusters of manganese ferrite
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 2012-02-05
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2011.12.027
Open Access Status Not Open Access
Volume 395
Start page 168
End page 174
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Hollow spheres and colloidal nanocrystal clusters (CNCs) of MnFe2O4 with similar submicron scales have been synthesized controllably by a solvothermal method through simply adjusting the synthesis microenvironment. Morphology and microstructure of the products were investigated by the power X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Magnetic property measurements at room temperature showed that MnFe2O4 hollow spheres were ferromagnetic with a very small hysteresis loop while MnFe2O4 CNCs showed superparamagnetic behavior. Magnetization saturation values were about 76.5 and 63.4 emu/g for hollow spheres and CNCs, respectively. The band gaps for hollow spheres and CNCs were 1.68 and 1.74 eV, respectively, based on the results of diffuse reflectance spectra (DRS). MnFe2O4 hollow spheres showed higher photocatalytic activity under visible light to methylene blue than that of CNCs. Both of the samples also displayed an excellent recycle performance. Formation mechanisms of MnFe2O4 hollow spheres and CNCs, and the relationship between their structure and properties, have been studied based on the experimental results.
Keyword Manganese ferrite
Hollow sphere
Colloidal nanocrystal cluster
Magnetism
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 20803037
ZR2009BM013
Institutional Status UQ
Additional Notes Available online 16 December 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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