Jorgetto, Alexandre de Oliveira [UNESP]Milbrat, AlexanderSchneider, José FabiánLi, ZhengGiammaria, GuidoSaeki, Margarida Juri [UNESP]Gianeti, Thiago Marcelo Ribeiro [UNESP]Lima, Giuseppina Pace Pereira [UNESP]Pedrosa, Valber de Albuquerque [UNESP]Mul, GuidoCastro, Gustavo Rocha de [UNESP]2018-12-112018-12-112018-11-01Applied Surface Science, v. 457, p. 121-133.0169-4332http://hdl.handle.net/11449/180004This 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.121-133engAdvanced oxidation processAnatase crystal growthMagnetic extractionMCM-41 silicaPhotocatalysisTitania coatingArtigo10.1016/j.apsusc.2018.06.218Acesso aberto2-s2.0-850493508142-s2.0-85049350814.pdf1802982806436894