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The effect of graphitized carbon on the adsorption and photocatalytic degradation of methylene blue over TiO(2)/C composites

The TiO(2)/C composites with approximately 40 wt% of carbon were prepared by calcination of precursors, formed from a one-pot liquid phase reaction between Ti(SO(4))(2) and flour. All TiO(2)/C composites displayed mesoporous structures with high BET surface areas (117–138 m(2) g(−1)) and small cryst...

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Detalles Bibliográficos
Autores principales: Cai, Jinlu, Hu, Shenghua, Xiang, Junhuai, Zhang, Honghua, Men, Dandan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057691/
https://www.ncbi.nlm.nih.gov/pubmed/35519181
http://dx.doi.org/10.1039/d0ra01105c
Descripción
Sumario:The TiO(2)/C composites with approximately 40 wt% of carbon were prepared by calcination of precursors, formed from a one-pot liquid phase reaction between Ti(SO(4))(2) and flour. All TiO(2)/C composites displayed mesoporous structures with high BET surface areas (117–138 m(2) g(−1)) and small crystal sizes of TiO(2) (8–27 nm). The contents of graphitic carbon and rutile TiO(2) increased, while the surface area and TiO(2) crystal size decreased for the TiO(2)/C composite on increasing the calcination temperature from 650 to 800 °C; when calcinated at 800 °C, the anatase TiO(2) completely changed into rutile TiO(2) in the TiO(2)/C composite. The TiO(2)/C composite calcinated at higher temperatures exhibited better adsorptive and photocatalytic degradation performance in the removal of methylene blue (MB). For the entire rutile TiO(2)/C-800 composite, the adsorption process of MB can be well described by the pseudo-second-order kinetic model and is governed by chemical adsorption with the maximum adsorption capacity value equal to about 15 mg g(−1). Under continuous illumination with a 254 nm UV lamp (15 W) for 3 h, the percentage of MB (14 mg l(−1)) photocatalytic degradation on 50 mg of TiO(2)/C-800 was 25.1% higher than that of the maximum adsorption removal. These results suggest that the graphitized carbon has a significant effect on the adsorptivity and photocatalytic activity of the TiO(2)/C composite.