Photocatalytic degradation of Reactive Black 5 with TiO2-coated magnetic nanoparticles

Marco S. Lucas*, Pedro B. Tavares, José A. Peres, Joaquim L. Faria, Mariana Rocha, Clara Pereira, Cristina Freire

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

A core-shell TiO2-coated magnetic nanomaterial, Fe 3O4@SiO2@TiO2, was prepared, characterized and tested as photocatalyst in the degradation of Reactive Black 5 (RB5) dye by a UV-photocatalytic path. For comparison, two reference materials were also evaluated as photocatalysts in the same reaction: as-prepared non-magnetic TiO2 and TiO2 from Evonik Degussa Company (P25). TEM characterization confirmed the core-shell structure of the Fe 3O4@SiO2@TiO2 nanocomposite, while SEM micrographs revealed that the particles presented a spherical morphology with sizes ranging from 140 to 160 nm. FTIR and XRD data confirmed the presence of magnetite (Fe3O4) cores, silica and anatase in the magnetic nanomaterial. The Fe3O4@SiO2@TiO 2 photocatalyst in combination with UV irradiation led to a RB5 degradation of 91% after 60 min, which was very similar to the values achieved with the as-prepared TiO2 (93%) and with P25 (97%). Furthermore, the magnetic nanocatalyst was efficiently separated from the reaction medium by magnetic decantation and could be reused three times with no decrease of the photocatalytic performance.
Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalCatalysis Today
Volume209
DOIs
Publication statusPublished - 15 Jun 2013
Externally publishedYes
Event7th European Meeting on Solar Chemistry and Photocatalysis - Environmental Applications (SPEA) - Porto, Portugal
Duration: 17 Jun 201320 Jun 2013
Conference number: 7

Keywords

  • Dye
  • Photocatalysis
  • Reactive Black 5
  • TiO magnetic nanoparticles
  • Water treatment

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