Open AccessEFFECT OF CARBON DIOXIDE ON THE STABILITY OF THE Ca2Fe2O5PHASE APPLIED IN THE PHOTOCATALYTIC DEGRADATION PROCESS OF METHYLENE BLUE
Author(s) -
Erandir Brasil da Silva,
Antoninho Valentini
Publication year - 2015
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20150159
Subject(s) - methylene blue , carbon dioxide , degradation (telecommunications) , photocatalysis , phase (matter) , materials science , carbon fibers , chemical engineering , environmental chemistry , chemistry , nuclear chemistry , organic chemistry , composite material , catalysis , telecommunications , computer science , engineering , composite number
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