Preparation and characterization of phosphate-modified mesoporous TiO2 incorporated in a silica matrix and their photocatalytic properties in the photodegradation of Congo red

This study describes the development of mesostructured TiO 2 photocatalysts modified with PO 4 3- to improve its specific surface area and reduce the recombination rate of the electron—hole pairs. The mesoporous photocatalyst was successfully incorporated into a high specific surface area silica mat...

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Bibliographic Details
Published in:Frontiers of materials science 2017-09, Vol.11 (3), p.250-261
Main Authors: Estrella González, Alberto, Asomoza, Maximiliano, Arellano, Ulises, Cipagauta Díaz, Sandra, Solís, Silvia
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Materials recovery
Materials Science
Nanocomposites
Nanomaterials
Phosphoric acid
Photocatalysis
Photocatalysts
Photodegradation
Photooxidation
Recovery time
Research Article
Silica
Silicon dioxide
Specific surface
Surface area
Tetraethyl orthosilicate
Titanium dioxide
Titanium oxides
Ultraviolet radiation
Wastewater
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Summary:This study describes the development of mesostructured TiO 2 photocatalysts modified with PO 4 3- to improve its specific surface area and reduce the recombination rate of the electron—hole pairs. The mesoporous photocatalyst was successfully incorporated into a high specific surface area silica matrix by the hydrolysis reaction of tetraethyl orthosilicate (TEOS). Pluronic 123 and phosphoric acid were used as the directing agent for the structure of the mesoporous TiO 2 and as a source of phosphorus, respectively. TiO 2 , P/TiO 2 , TiO 2 -SiO 2 and P/TiO 2 -SiO 2 materials were characterized by BET, XRD, TEM-EDS, FTIR and UV-vis DRS measurements. The photoactivity of TiO 2 -SiO 2 nanocomposites containing 15 wt.% photocatalyst/silica was evaluated in the degradation reaction of anionic dyes with UV radiation. The proposed nanomaterials showed high potential for applications in the remediation of wastewater, being able to reuse in several cycles of reaction, maintaining its photoactivity and stability. The separation and recovery time of the material is reduced between cycles since no centrifugation or filtration processes are required after the photooxidation reaction.
ISSN:2095-025X
2095-0268
DOI:10.1007/s11706-017-0389-5