FACILE HYDROTHERMAL SYNTHESIS OF NIOBIUM PENTOXIDE SEMICONDUCTOR AND THEIR APPLICATION IN THE PHOTODEGRADATION OF DYES AND REDUCTION OF FREE FAT ACIDS IN WASTE OIL

Autor: Camilo Aurélio Brandão Crisóstomo, Fernanda Barbos Damacenoa, Luele Ribeiro de Sousa Barbosa, Jânio Santos Almeida, Walker Vinicius Ferreira do Carmo Batista, Andréa Renata Malagutti, João Paulo de Mesquita, Juliana Arriel Torres, Gustavo Duran Iga, Caue Ribeiro de Oliveira, Roberto Ananias Ribeiro, Henrique A. J. L. Mourão
Jazyk: English<br />Spanish; Castilian<br />Portuguese
Rok vydání: 2024
Předmět:
Zdroj: Química Nova, Vol 48, Iss 1 (2024)
Druh dokumentu: article
ISSN: 1678-7064
0100-4042
DOI: 10.21577/0100-4042.20250015
Popis: We report a facile hydrothermal method for the synthesis of niobium pentoxide (Nb2O5) under two different temperatures, 120 °C (Nb2O5-120) and 150 °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.
Databáze: Directory of Open Access Journals
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