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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Towards thermally stable aerogel photocatalysts: TiCl4-based sol-gel routes for the design of nanostructured silica-titania aerogel with high photocatalytic activity and outstanding thermal stability

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Author(s):
Ferreira-Neto, Elias Paiva [1] ; Worsley, Marcus Andre [2] ; Rodrigues-Filho, Ubirajara Pereira [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 - USA
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 7, n. 5 OCT 2019.
Web of Science Citations: 0
Abstract

Despite their excellent textural/structural properties, usage of aerogels in photocatalytic applications is critically limited by the necessity of high temperature annealing procedures to improve crystallinity, which lead to drastically decrease in surface area and the undesirable phase transformations. In this study, we report two novel straightforward TiCl4-based sol-gel routes for synthesis of SiO2/TiO2 nanocomposite and SiO2@TiO2 core-shell aerogels with exceptional photocatalytic performance even after annealing at temperatures as high as 1000 degrees C. While core-shell aerogels prepared by thermo-induced deposition method show higher and unprecedented thermal stability, epoxide-assisted gelation method offers greater control over phase composition, allowing preparation of highly photoactive anatase/rutile bicrystalline silica-titania nanocomposite aerogels. The improved structural properties achieved result in an increase of photocatalytic activity of silica-titania aerogels after high temperature annealing at 1000 degrees C. Such unusually high thermal stabilities outperform those shown by previously reported titania and silica-titania materials, representing significant advance on the design of thermally stable photocatalysts for applications that require the catalyst to undergo high temperature processing or endure extreme operating conditions. (AU)

FAPESP's process: 13/24948-3 - CO2 Fixation by SiO2@TiO2 nanoparticles decorated with Iron Ferrocyanide (Prussian Blue) and Ruthenium Ferrocyanide: Toward high Sustainability of Biorefineries and Ammonia Synthesis Plants.
Grantee:Elias Paiva Ferreira Neto
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 16/10939-0 - TiO2 based nanostructured materials modified with Prussian Blue and Transition Metal Disulfides as photocatalysts for CO2 reduction
Grantee:Elias Paiva Ferreira Neto
Support type: Scholarships abroad - Research Internship - Doctorate