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Crisostomo, Camilo Aurelio Brandao ; Damaceno, Fernanda Barbosa ; Barbosa, Luele Ribeiro de Sousa ; Almeida, Janio Santos ; Batista, Walker Vinicius Ferreira do Carmo ; Malagutti, Andrea Renata ; de Mesquita, Joao Paulo ; Torres, Juliana Arriel ; Iga, Gustavo Duran ; de Oliveira, Caue Ribeiro ; Ribeiro, Roberto Ananias ; Mourao, Henrique A. J. L.

• Tipo de documento: Artigo Científico
• Fonte: Química Nova; v. 48, n. 1, p. 8-pg., 2025-01-01.

Resumo

We report a facile hydrothermal method for the synthesis of niobium pentoxide (Nb2O5) under two different temperatures, 120 degrees C (Nb2O5-120) and 150 degrees C (Nb2O5-150). The obtained materials were characterized by structural, optical and morphological techniques. Also, the photocatalytic properties of the Nb2O5 samples were evaluated in two reactions under ultraviolet (UVC) irradiation: degradation of methylene blue (MB) and indigo carmine (IC) dyes; and esterification of free fatty acids (FFA) present in waste cooking oil (WCO). The Nb2O5 was formed at different temperatures of synthesis, and the increase in temperature did not cause significant changes in the structural and optical characteristics, but resulted in an increased surface area of the synthesized materials. Both synthesized materials showed excellent efficiency for dye photodegradation. The sample Nb2O5-150 presented the best performance for the MB photodegradation, with almost 85% of the removal efficiency. In this case, the adsorption of MB molecules on the surface of the material was high due to the favorable electrostatic interaction and also because of its high surface area. For the IC photodegradation, the adsorption was insignificant, and both samples presented approximately 100% of the removal efficiency. These materials were also promising for the reduction of free fat acids in waste oil by photoesterification. (AU)

• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático