Influence of Citric Acid/Metallic Cations Ratio in the Structure, Morphology and Photocatalytic Activity of TiO2 Prepared by Pechini Method
This aim of this work is to evaluate the influence of citric acid/metallic cation ratio of 3:1, 4:1 and 5:1 used in the TiO2 synthesis by Pechini method in the structure, morphology and photocatalytic activity of methyl red dye. The prepared samples were characterized by X-ray Diffraction (XRD) using Rietveld refinement method, textural analyses, and photocatalytic activity. The results obtained by XRD technique confirm the efficiency of the Pechini method in the preparation of TiO2 samples with nanosize particle. All samples present anatase phase and presence of rutile as secondary phase with content of 15.6, 10.5 and 18.3%. The isothermal adsorption showed that samples have mesopores characteristics and morphology with irregular shape agglomerates. The sample 4:1 presented better photocatalytic performance discoloring 70% of dye in 24h, indicating that the presence of 10.5% of rutile phase jointly with anatase phase improve the photocatalytic activity.
Lucio Salgado and Francisco Ambrozio Filho
P.C. Ribeiro et al., "Influence of Citric Acid/Metallic Cations Ratio in the Structure, Morphology and Photocatalytic Activity of TiO2 Prepared by Pechini Method", Materials Science Forum, Vols. 727-728, pp. 1278-1283, 2012