Highly enhanced adsorption and photocatalytic performance of TiO2 quantum dots synthesized by microwaves for degradation of reactive red azo dye

Autor: Kaoma Betega, João Batista Rodrigues Neto, Dachamir Hotza, Marcela Sagrilo Frizzo, Gilberto S. Falk, C.M. Poffo
Rok vydání: 2021
Předmět:
Zdroj: Journal of Nanoparticle Research. 23
ISSN: 1572-896X
1388-0764
DOI: 10.1007/s11051-021-05237-x
Popis: In this work, highly homogeneous TiO2 quantum dots (QDs) were synthesized and evaluated about their adsorption potential and applied as photocatalysts for the degradation of reactive red azo dye (RR141). QDs were produced by a low-energy and eco-friendly microwave-assisted method. Different microwave times (10, 20, 30, and 60 min) and temperatures (120, 140, 160, 180 °C) were evaluated. Raman and X-ray diffraction (XRD) data detected anatase as the major crystalline phase. XRD also indicated an increase in the interfacial component as the microwave temperature decreases, resulting in a highly energetic surface and super-adsorptive QDs. TiO2 crystallites presented an average size of 5 to 6.2 nm as calculated from the Scherrer equation and confirmed by TEM micrographs. As a feature of the particle size reduction, the QDs synthesized by 10 min and 120 °C presented a large specific surface area (~ 259 m2·g−1), higher interfacial component (60%), high adsorptivity, and a fast (~ 5 min) 100% degradation of RR141, making this a promising photocatalyst techno-commercial material.
Databáze: OpenAIRE
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