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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

SILVA, Erandir Brasil da  and  VALENTINI, Antoninho. EFFECT OF CARBON DIOXIDE ON THE STABILITY OF THE Ca2Fe2O5 PHASE APPLIED IN THE PHOTOCATALYTIC DEGRADATION PROCESS OF METHYLENE BLUE. Quím. Nova [online]. 2015, vol.38, n.10, pp.1265-1272. ISSN 1678-7064.  https://doi.org/10.5935/0100-4042.20150159.

Solid samples containing a Ca2Fe2O5 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 Ca2Fe2O5 phase was evaluated in the photocatalytic degradation of methylene blue (MB) in aqueous solution in the presence of bubbling gas (air, N2, or CO2). The presence of CO2 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 Ca2Fe2O5 phase in aqueous systems and the significant effect of CO2 on the photocatalytic activity of the Ca2Fe2O5 phase.

Keywords : carbon dioxide; photocatalysis; Ca2Fe2O5; methylene blue.

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