Narrow Results

In this work, we presented a facile, one-step preparation for magnetic mesoporous Fe₃O₄-SiO₂ composites under closely neutral conditions by an evaporation-induced self-assembly (EISA) and adding 1,3,5-TMB as co-solvent approach. The resulting samples were characterized by X-ray diffraction, N₂ adsorption measurement, FT-IR and SEM. Magnetic mesoporous composites and H₂O₂ form heterogeneous Fenton in order to removal methylene blue as the dye wastewater model object. The catalysts showed high catalytic activity and stability in the decolorization of methlye blue.

The oxidation of naphthalene was investigated in a biomimetic catalytic system using KHSO₅ and iron(III) tetrakis(p-sulfonatophenyl)porphyrin (FeTPPS) in order to elucidate the influence of solution forms, such as buffer pH and co-solvent types, on the reaction. 1,4-naphthoquinone was the main byproduct and the efficiency of oxidation, particularly 1,4-naphthoquinone formation, was influenced by pH and the type of co-solvent used. The most efficient conversion of 1,4-naphthoquinone was observed at an acidic pH (= 3). At higher pH, the formation of μ-oxo species (OFe₂(TPPS)₂) leads to a decrease of the percentage of naphthalene oxidized. In addition, the organic co-solvents (methanol, ethanol, 2-propanol and acetonitrile) influenced the amounts of naphthalene conversion. The amounts of 1,4-naphthoquinone formed were related to the electron donating character of the organic co-solvents.