Supporting the Photocatalysts on ZrO2: An Effective Way to Enhance the Photocatalytic Activity of SrSnO3

Luzia Castro Honório, André Menezes, Edson Cavalcanti Da Silva Filho, Josy Osajima, Amer Hakki, Donald Macphee, Ieda Maria Garcia dos Santos* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Photocatalysts based on SrSnO3 and SrSnO3@ZrO2 were prepared by the modified-Pechini method and applied in the photocatalytic degradation of a textile azo-dye under UV radiation. The photohydroxylation of terephthalic acid and scavengers were employed in order to evaluate the participation of each active species, such as hydroxyl radical, and photogenerated electrons and holes on the photocatalytic process. The band gap structure was evaluated using the Mott Schottky method in combination with UV-visible spectrophotometry. Both samples had high photocatalytic activity, although SrSnO3@ZrO2 showed the best decolorization performance ranging from 32% to 98%. This behavior was assigned to the best dispersion of the active phase on the support and to the Sn(II) reduced states, observed by XPS. The participation of hydroxyl radicals in the reaction was confirmed when terephthalic acid was used as probe and by using isopropanol as hydroxyl radical scavenger, which resulted in the inhibition of the photocatalytic process.
Original languageEnglish
Article number146991
Number of pages11
JournalApplied Surface Science
Volume528
Early online date18 Jun 2020
DOIs
Publication statusE-pub ahead of print - 18 Jun 2020

Keywords

  • Perovskite
  • SrSnO3
  • band gap structure
  • photocatalysis
  • active species
  • Active species
  • SrSnO
  • Photocatalysis
  • Band gap structure

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