Influence of different activation strategies on the activity and stability of MIL-53(Fe) as a dark-Fenton heterogeneous catalyst

BERNINI, MARÍA C.; BARBERO, BIBIANA P.; GARCÍA BLANCO, ANDRÉS A.; NARDA, GRISELDA E.; ORTEGA MORENO, GABRIELA A.; MARCHETTI, SERGIO G.

MICROPOROUS AND MESOPOROUS MATERIALS

ELSEVIER SCIENCE BV

Año: 2020 vol. 303

1387-1811

MIL-53(Fe) was synthesized using solvothermal method without HF. Three different activation methodologieswere applied in order to remove N,N-dimethylformamide (DMF) from the inner pores of the material. Theincidence of these treatments in the activity and stability as heterogeneous catalyst in a dark-Fenton reaction wasevaluated for Rhodamine 6G (Rh6G) degradation. Important improvements in the catalytic performance of MIL-53(Fe) were obtained after activation. Operational variables such as pH, reaction temperature, [H2O2]/[Fe]molar ratio, and initial Rh6G concentration were evaluated. Likewise, catalyst reusability assays were alsoperformed. The obtained results indicate that a partial removal of DMF affects not only the stability but also thecatalytic activity of MIL-53(Fe) in the Fenton reaction. Different solid state characterization techniques,including PXRD, SEM, FTIR, elemental analysis, XPS, and M?ossbauer spectroscopy, were applied to the as-synthesized and activated materials as well as post-reaction catalysts in order to understand the catalyticbehavior. 3þ