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

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Abstract

This study describes the development of mesostructured TiO2 photocatalysts modified with PO43- 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 TiO2 and as a source of phosphorus, respectively. TiO2, P/TiO2, TiO2-SiO2 and P/TiO2-SiO2 materials were characterized by BET, XRD, TEM-EDS, FTIR and UV-vis DRS measurements. The photoactivity of TiO2-SiO2 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.

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Acknowledgements

We thank the National Science and Technology Council of Mexico (CONACYT) for the Scholarship No. 313880. We are very grateful to Victor Hugo Lara and Patricia Castillo for their timely and professional technical assessment in several of the experimental techniques employed in this work.

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Authors and Affiliations

  1. Department of Chemistry, Metropolitan Autonomous University-Iztapalapa, P.O. Box 55-532, C.P. 09340, México City, México

    Alberto Estrella González, Maximiliano Asomoza, Ulises Arellano, Sandra Cipagauta Díaz & Silvia Solís

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  1. Alberto Estrella González
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  2. Maximiliano Asomoza
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  3. Ulises Arellano
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  4. Sandra Cipagauta Díaz
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Correspondence to Alberto Estrella González.

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Estrella González, A., Asomoza, M., Arellano, U. et al. Preparation and characterization of phosphate-modified mesoporous TiO2 incorporated in a silica matrix and their photocatalytic properties in the photodegradation of Congo red. Front. Mater. Sci. 11, 250–261 (2017). https://doi.org/10.1007/s11706-017-0389-5

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  • DOI: https://doi.org/10.1007/s11706-017-0389-5

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