Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation
| Autor: | Jaderson L. Milagres, Marciano F. de Almeida, Ann H. Mounteer, Liany D.L. Miranda, Sukarno Olavo Ferreira, Carlos Roberto Bellato |
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| Rok vydání: | 2015 |
| Předmět: |
Aqueous solution
Materials science Inorganic chemistry Composite number Layered double hydroxides General Physics and Astronomy Nanoparticle Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Surfaces Coatings and Films law.invention Catalysis TiO2 photocatalysis chemistry.chemical_compound Semiconductor composite chemistry law Layered double hydroxide Phenol degradation Photocatalysis engineering Phenol Calcination |
| Zdroj: | LOCUS Repositório Institucional da UFV Universidade Federal de Viçosa (UFV) instacron:UFV |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2015.10.009 |
| Popis: | A series of TiO 2 /MgZnAl photocatalysts were successfully synthesized from ternary (Mg, Zn and Al) layered double hydroxides impregnated with TiO 2 nanoparticles by the co-precipitation method at variable pH with different Zn 2+ /Mg 2+ molar ratios. The composite photocatalysts were calcined at 500 °C resulting in the incorporation of oxide zinc, in the calcined MgZnAl LDH structure. Synergistic effect between ZnO and TiO 2 lead to significant enhancement of TiO 2 /MgZnAl photocatalytic activity. Composite photocatalysts were characterized by ICP-MS, N 2 adsorption-desorption, XRD, SEM, EDS, IR and UV–vis DRS. Phenol in aqueous solution (50 mg/L) was used as a model compound for evaluation of UV–vis (filter cut-off for λ > 300 nm) photocatalytic activity. The most efficient photocatalyst composite was obtained at a 5% Zn 2+ /Mg 2+ molar ratio, in the catalyst identified as TiO 2 /MgZnAl-5. This composite catalyst had high photocatalytic activity, completely destroying phenol and removing 80% of total organic carbon in solution after 360 min. The TiO 2 /MgZnAl-5 catalyst remained relatively stable, presenting a 15% decrease in phenol degradation efficiency after five consecutive photocatalytic cycles. |
| Databáze: | OpenAIRE |
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