Use of Fe2O3-TiO2 in solar photo-Fenton process for the phenol degradation

Jerlan Alves da Silva, Gessyca Borges dos Santos, Vivian Stumpf Madeira, Maria Luisa de Almeida Ramalho, Islanny Larissa Ouriques Brasileiro, Arthur Marinho Cahino


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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