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

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; Castro, Gustavo Rocha de [UNESP]

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

Arquivos

2-s2.0-85049350814.pdf (4.02 MB)

Data

2018-11-01

Autores

Jorgetto, Alexandre de Oliveira

Milbrat, Alexander

Schneider, José Fabián

Li, Zheng

Giammaria, Guido

Saeki, Margarida Juri

Gianeti, Thiago Marcelo Ribeiro

Lima, Giuseppina Pace Pereira

Pedrosa, Valber de Albuquerque

Mul, Guido

Tipo

Artigo

Direito de acesso

Acesso aberto

Resumo

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.