Use of Fe2O3-TiO2 in solar photo-Fenton process for the phenol degradation
DOI:
https://doi.org/10.22409/engevista.v20i5.13332Resumo
In this work a Fe2O3-TiO2 catalyst, at the proportion 60:40 (%mass), was produced using a modified Pechini method. The catalyst was characterized and used in the degradation of phenol in aqueous solution through a solar photo-Fenton reaction. Experiments were performed varying the concentration of H2O2, catalyst, phenol, and pH of the aqueous solution, in order to determine the reaction rate and propose a mechanism. Characterization showed the presence of Fe2O3 and anatase and rutile phases of TiO2. Pseudobrookite (Fe2TiO5) was also found in the material. The Fe2O3-TiO2 catalyst presented higher efficiency (90% of phenol removal) and degradation rate than the two isolated oxides in the process photo-Fenton heterogenous in optimum conditions. The proposed mechanism shows that the union of the two oxides, Fe2O3 and TiO2, facilitates the reduction and oxidation reactions of Fe+ 2/Fe+ 3 and Ti+4/Ti+3, increasing the amount of surface OH groups and consequently the catalytic activity.
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