EFFECT OF CARBON DIOXIDE ON THE STABILITY OF THE Ca2Fe2O5 PHASE APPLIED IN THE PHOTOCATALYTIC DEGRADATION PROCESS OF METHYLENE BLUE

Química Nova

Valentini, Antoninho¹  Universidade Federal do Ceará, Fortaleza, Brasil¹  Silva, Erandir Brasil da¹ 

关键词:  carbon dioxide;    photocatalysis;    Ca2Fe2O5;    methylene blue;   

DOI  :  10.5935/0100-4042.20150159

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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.

【 授权许可】

Unknown