Magnetically-extractable hybrid of magnetite, mesoporous silica and titania for the photo-degradation of organic compounds in water

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Jorgetto, Alexandre de Oliveira [UNESP]
Milbrat, Alexander
Schneider, José Fabián
Li, Zheng
Giammaria, Guido
Saeki, Margarida Juri [UNESP]
Gianeti, Thiago Marcelo Ribeiro [UNESP]
Lima, Giuseppina Pace Pereira [UNESP]
Pedrosa, Valber de Albuquerque [UNESP]
Mul, Guido

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This work addresses the development of a magnetically extractable magnetite-silica-titania photocatalyst to be applied in the degradation of organic compounds in water. MCM-41 silica was successfully deposited on magnetite, providing large surface area for anchoring of TiOx species, and preventing thermally induced conversion of magnetite to hematite. A good correlation between the calculated values and amount of titania deposited on the silica-covered magnetite particles was obtained for a synthesis route involving the treatment of magnetite-silica in boiling ethanolic Ti-precursor solution. Photocatalytic activity in conversion of 4-chlorophenol could only be observed for compositions containing larger than ∼50 wt% titania, whereas increasing the titania content did not significantly improve performance. Experiments carried out at pH ∼ 3.0 and ∼7.2 demonstrated the performance is relatively pH-independent. The structure activity-correlation of the materials is briefly discussed.



Advanced oxidation process, Anatase crystal growth, Magnetic extraction, MCM-41 silica, Photocatalysis, Titania coating

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Applied Surface Science, v. 457, p. 121-133.