Nanostructured KxNa1-xNbO3 hollow spheres as potential materials for the photocatalytic treatment of polluted water
| Autor: | Fabiano R. Praxedes, Silvania Lanfredi, Marcos Augusto Lima Nobre, Po S. Poon, Juan Matos |
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| Přispěvatelé: | Universidade Estadual Paulista (UNESP), Barrio Universitario s/n, Universidad Autónoma de Chile |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Process Chemistry and Technology Photodissociation Aqueous two-phase system Catalysis Hollow spheres Adsorption Basic blue 41 Chemical engineering KxNa1-xNbO3 photocatalysts Desorption Photocatalysis Degradation (geology) Irradiation Fourier transform infrared spectroscopy Ultrasonic spray pyrolysis General Environmental Science |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2021.120502 |
| Popis: | Made available in DSpace on 2022-04-28T19:41:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-12-05 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Potassium-sodium niobate-based hollows spheres were studied in the photocatalytic degradation of Basic Blue 41 dye in aqueous phase under UV irradiation. KxNa1-xNbO3 materials were prepared at 700 °C by the spray pyrolysis method. Photocatalysts were characterized by XRD, SEM, TEM, N2 adsorption/desorption isotherms and FTIR. Different kinetic models of adsorption, direct photolysis, and photocatalytic degradation of the azo-dye were performed as a function of the pH of solution. The increase in potassium content is responsible of the distortion and polarization of the niobate structure promoting a decrease in the energy band-gap down to 3.01 eV for K0.5Na0.5NbO3. The photocatalytic activity observed on K0.5Na0.5NbO3 was up to 23 times higher than that on TiO2 in terms of the surface concentration of the azo-dye molecules adsorbed. A mechanism for the degradation of Basic Blue 41 azo-dye based on the reactive oxygen species detected by scavenger's tests and mass-spectroscopy analysis was proposed. São Paulo State University (Unesp) School of Technology and Sciences São Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences Unidad de Desarrollo Tecnológico (UDT) Universidad de Concepción Barrio Universitario s/n Instituto de Ciencias Químicas Aplicadas Facultad de Ingeniería Universidad Autónoma de Chile São Paulo State University (Unesp) School of Technology and Sciences São Paulo State University (Unesp) Institute of Biosciences Humanities and Exact Sciences CAPES: 001 |
| Databáze: | OpenAIRE |
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