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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.)

Insights into formation of anatase TiO2 nanoparticles from peroxo titanium complex degradation under microwave-assisted hydrothermal treatment

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de Mendonca, Vagner R. [1] ; Lopes, Osmando F. [2] ; Avansi Jr, Waldir ; Arenal, Raul [3, 4] ; Ribeiro, Caue [5, 6]
Total Authors: 5
[1] Fed Inst Educ Sci & Technol Sao Paulo, IFSP Campus Itapetininga, BR-18202000 Itapetininga, SP - Brazil
[2] Univ Fed Uberlandia, Inst Chem, BR-38400902 Uberlandia, MG - Brazil
[3] ARAID Fdn, Zaragoza 50018 - Spain
[4] Univ Zaragoza, Inst Nanociencia Aragon, Lab Microscopias Avanzadas, Calle Mariano Esquillor, Zaragoza 50018 - Spain
[5] Embrapa Instrumentat, Rua 15 Novembro 1452, BR-13560970 Sao Carlos, SP - Brazil
[6] Forschungszentrum Julich, Inst Energy & Climate Res IEK Electrochem Proc En, D-52425 Julich - Germany
Total Affiliations: 6
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 45, n. 17, B, p. 22998-23006, DEC 1 2019.
Web of Science Citations: 2

Several methods for the synthesis of anatase TiO2 have been reported in the literature. In particular, the microwave-assisted hydrothermal crystallization of Ti-peroxocomplexes has enabled the phase and morphological control of TiO2 nanoparticles by adjusting the synthesis conditions, such as pH, time and temperature, with significant increase in the reaction rate compared to the conventional sol-gel techniques. In this paper, we uncover the mechanism involved in the formation of anatase TiO2 nanoparticles from the Ti-peroxo complex precursor route. Structural characterizations (XRD, Raman, TEM and XANES) revealed that the Ti-peroxo complex precursor exhibits a titanate-like structure, comprised of bulk NH4+ ions and surface peroxo groups. The NH4+ ions release during hydrothermal treatment is determining on the anatase TiO2 nanoparticle formation, which occurs concomitantly with the decomposition of peroxogroups. UV-induced dye photodegradation tests involving the Ti-peroxo complex precursor and TiO2 nanoparticles showed that the precursor is not able to form hydroxyl radicals that are the main chemical species responsible for the dye photodegradation, despite the presence of peroxo groups at its surface. The results herein highlight the mechanism involved in the formation of anatase TiO2 nanoparticles, which could assist in the development of new synthesis approaches based on Ti-peroxocomplex precursors. (AU)

FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
Grantee:José Maria Correa Bueno
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 15/14330-8 - Studies in the synthesis and application of semiconducting nanocrystal heterostructures in artificial photosynthetic processes
Grantee:Cauê Ribeiro de Oliveira
Support Opportunities: Research Program on Global Climate Change - Regular Grants