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

Alexandre de Oliveira Jorgetto* (Corresponding Author), Alexander Milbrat, José Fabián Schneider, Zheng Li, Guido Giammaria, Margarida Juri Saeki, Thiago Marcelo Ribeiro Gianeti, Giuseppina Pace Pereira Lima, Valber de Albuquerque Pedrosa, Guido Mul, Gustavo Rocha de Castro

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)121-133
Number of pages13
JournalApplied surface science
Volume457
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

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

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