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BIBTEX RIS

EFFECT OF CARBON DIOXIDE ON THE STABILITY OF THE Ca 2 Fe 2 O 5 PHASE APPLIED IN THE PHOTOCATALYTIC DEGRADATION PROCESS OF METHYLENE BLUE

2015; Brazilian Chemical Society; Linguagem: Inglês

10.5935/0100-4042.20150159

ISSN

1678-7064

Autores

Erandir Brasil da Silva, Antoninho Valentini,

Tópico(s)

Pigment Synthesis and Properties

Resumo

OF METHYLENE BLUE.Solid samples containing a Ca 2 Fe 2 O 5 phase were synthesized using the Pechini method.The samples were characterized using X-ray diffraction, thermogravimetric analysis, differential thermal analysis, X-ray fluorescence, nitrogen adsorption/desorption isotherms, and scanning electron microscopy.The stability of the Ca 2 Fe 2 O 5 phase was evaluated in the photocatalytic degradation of methylene blue (MB) in aqueous solution in the presence of bubbling gas (air, N 2 , or CO 2 ).The presence of CO 2 is known to suppress MB degradation.After the photocatalytic test, changes were observed in the crystalline phase of all systems.These results suggest the low stability of the Ca 2 Fe 2 O 5 phase in aqueous systems and the significant effect of CO 2 on the photocatalytic activity of the Ca 2 Fe 2 O 5 phase.

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