SrSnO3 perovskite obtained by the modified Pechini method: Insights about its photocatalytic activity

Ana Rita Ferreira Alves Teixeira, Alex de Meireles Neris, Elson Longo, José Rodrigues de Carvalho Filho, Amer Hakki, Donald E. MacPhee, Ieda Maria Garcia dos Santos (Corresponding Author)

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The use of SrSnO3 as a photocatalyst in different applications has been growing in recent years, particularly for degradation of organic dyes. In the present work, SrSnO3 catalyst was synthesized by the modified Pechini method and applied in the photocatalytic degradation of a textile azo-dye in aqueous solution under ultraviolet irradiation. The dominant photocatalytic species for this system were evaluated, determined from terephthalic acid photohydroxylation and from different scavengers. Moreover, electrochemical data were used to evaluate charge transfer between SrSnO3 and the species involved in the photocatalysis – O2, H2O and the scavengers. The irradiation time required to achieve 98% decolorization of a Remazol Golden Yellow (RNL) solution was 10 h. The catalyst simultaneously reduced all the absorption bands in the UV–vis spectrum of RNL, suggesting pollutant degradation. Isopropanol, silver and formic acid were all employed to test the importance of different photocatalytic processes and the photohydroxylation of terephthalic acid confirmed the generation of OH. A comparison of the SrSnO3 band positions and the potential of relevant redox couples suggests possible mechanisms for OH generation from both photogenerated carrier types (electrons and holes), in agreement with the results obtained using the hole/electron scavengers.
Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalJournal of Photochemistry and Photobiology. A, Chemistry
Volume369
Early online date15 Oct 2018
DOIs
Publication statusPublished - 31 Jan 2019

Keywords

  • photocatalysis
  • strontium stannate
  • scavenger
  • isopropanol
  • hydroxyl radical
  • Photocatalysis
  • Scavenger
  • Strontium stannate
  • Hydroxyl radical
  • Isopropanol
  • DISCOLORATION
  • OXIDATION
  • ELECTRODES
  • MSNO3 M
  • NANOPARTICLES
  • REDUCTION
  • PHOTODEGRADATION
  • DEGRADATION
  • TIO2
  • WATER

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Chemical Engineering(all)
  • Chemistry(all)

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  • Cite this

    Alves Teixeira, A. R. F., de Meireles Neris, A., Longo, E., de Carvalho Filho, J. R., Hakki, A., MacPhee, D. E., & Garcia dos Santos, I. M. (2019). SrSnO3 perovskite obtained by the modified Pechini method: Insights about its photocatalytic activity. Journal of Photochemistry and Photobiology. A, Chemistry, 369, 181-188. https://doi.org/10.1016/j.jphotochem.2018.10.028