Synthesis and characterization of α-Ag2MoO4/β-Ag2MoO4 heterostructure obtained by fast and simple ultrasonic spray pyrolysis method at diferent temperatures

• Autor(a) principal: Paskocimas, Carlos Alberto
• Data de Publicação: 2020
• Outros Autores: Ferreira, Erik Alexander Cunha, Andrade Neto, Nivaldo Freire de, Santiago, Anderson de Azevedo Gomes, Delmonte, Maurício Roberto Bomio, Motta, Fabiana Villela da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• DOI: 10.1007/s10854-020-02980-0
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/31988
• topic: α-Ag2MoO4/β-Ag2MoO4; Heterostructure; Ultrasonic spray pyrolysis; Temperatures

In this work, microspheres of α-Ag2MoO4/β-Ag2MoO4 were obtained by ultrasonic spray pyrolysis (USP) at temperatures of 400, 500, 600, and 700 °C. Characterizations of X-ray difraction (XRD), feld emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), Raman scattering, and ultraviolet–visible spectroscopy (UV–Vis) were performed on the samples. The beta phase is present in all samples, while the alpha phase forming α/β-Ag2MoO4 appears from 500 to 700 °C. FE-SEM images indicate the tendency of micrometric sphere formation, in which the increase of temperature promotes a smoothing on the surface. The α/β-Ag2MoO4 heterostructure was a better photocatalytic performance on methylene blue dye (MB) degradation than the pure beta phase. The MB was 87% reduced by the pure beta phase and 100% reduced by the α/β-Ag2MoO4 after 45 min of photocatalysis