SrSnO3 perovskite obtained by the modified Pechini method—Insights about its photocatalytic activity
| Autor: | Elson Longo, Donald E. Macphee, Ieda Maria Garcia dos Santos, A. M. Neris, Ana Rita Ferreira Alves Teixeira, José Rodrigues Filho, Amer Hakki |
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| Přispěvatelé: | Universidade Federal da Paraíba (UFPB), University of Aberdeen, Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Terephthalic acid
Aqueous solution Formic acid Strontium stannate General Chemical Engineering General Physics and Astronomy 02 engineering and technology General Chemistry Isopropanol 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry Electrochemistry 01 natural sciences Redox 0104 chemical sciences Catalysis Scavenger chemistry.chemical_compound chemistry Photocatalysis 0210 nano-technology Photodegradation Hydroxyl radical |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2019-10-06T16:53:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-15 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 [rad]OH. A comparison of the SrSnO3 band positions and the potential of relevant redox couples suggests possible mechanisms for [rad]OH generation from both photogenerated carrier types (electrons and holes), in agreement with the results obtained using the hole/electron scavengers. NPE/LACOM Núcleo de Pesquisa e Extensão - Laboratório de Combustíveis e Materiais Universidade Federal da Paraíba Department of Chemistry University of Aberdeen, Meston Building, Meston Walk CDMF/LIEC Universidade Estadual Paulista IQ-UNESP CDMF/LIEC Universidade Estadual Paulista IQ-UNESP |
| Databáze: | OpenAIRE |
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