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Physical and photo-electrochemical properties of MgFe2O4 prepared by sol gel route: application to the photodegradation of methylene blue.
- Source :
- Journal of Materials Science: Materials in Electronics; Mar2019, Vol. 30 Issue 6, p5375-5382, 8p
- Publication Year :
- 2019
-
Abstract
- The spinel MgFe<subscript>2</subscript>O<subscript>4</subscript> synthesized by sol gel method, was characterized by physical and electrochemical methods. The thermal analysis (TG) gives an optimal synthesis temperature of 650 °C where the X-ray diffraction pattern exhibits a single phase crystallizing in a cubic symmetry (Space Group: Fd3-m) with spherical crystallites (~ 0.45 µm). The morphology observed through the SEM image shows elliptical and spherical grains of ~ 0.8 µm. The spinel possesses a direct optical transition (2.16 eV) due to electrons transfer Fe<superscript>3+</superscript>: d−d transition, coming from the crystal field splitting in agreement with the red color. The low electrons mobility is assigned to a narrow conduction band of Fe<superscript>3+</superscript>: 3d parentage with activation energy (0.14 eV) in conformity with a conduction mechanism by small polaron hopping. The semi-logarithmic plot confirms the chemical stability of oxide. Unlike other spinels, the capacitance plot exhibits n type conduction confirmed by chrono-amperometry with a flat band potential (E<subscript>fb</subscript>) of 0.27 V. The electrochemical impedance spectroscopy displays a semi-circle attributed to the bulk behavior. As application, the photodegradation of methylene blue (10 mg L<superscript>− 1</superscript>) was successfully on the spinel suspension; 87% are eliminated after 2 h of exposure to sunlight irradiation. [ABSTRACT FROM AUTHOR]
- Subjects :
- PHOTOELECTROCHEMISTRY
PHOTODEGRADATION
METHYLENE blue
SOL-gel processes
SPINEL group
Subjects
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 30
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 135478210
- Full Text :
- https://doi.org/10.1007/s10854-019-00830-2