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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.)

Kaolinite-titanium oxide nanocomposites prepared via sol-gel as heterogeneous photocatalysts for dyes degradation

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Barbosa, Lorrana Vietro [1] ; Marcal, Liziane [1] ; Nassar, Eduardo J. [1] ; Calefi, Paulo S. [1] ; Vicente, Miguel A. [2] ; Trujillano, Raquel [2] ; Rives, Vicente [2] ; Gil, Antonio [3] ; Korili, Sophia A. [3] ; Ciuffi, Katia J. [1] ; de Faria, Emerson H. [1]
Total Authors: 11
[1] Univ Franca, BR-14404600 Franca, SP - Brazil
[2] Univ Salamanca, GIR QUESCAT Dept Quim Inorgan, Salamanca 37008 - Spain
[3] Univ Publ Navarra, Dept Quim Aplicada, Pamplona 31006 - Spain
Total Affiliations: 3
Document type: Journal article
Source: CATALYSIS TODAY; v. 246, p. 133-142, MAY 15 2015.
Web of Science Citations: 27

A purified natural kaolinite was functionalized with titanium(IV) isopropoxide via the hydrolytic sol-gel route and thermally treated at several temperatures, between 100 and 1000 degrees C, for 24 h. The resulting solids were used for photodegradation (lambda=365 nm, 30W) of Methylene Blue (MB) and Methyl Orange II (MOII) dyes. All the solids efficiently degraded the dyes and almost total bleaching of the aqueous solutions was observed after 1 h.The best results were found for the solid heated at 400 degrees C, which degraded 93% of MOII and 99% of MB. Comparative studies with titanium oxide P25 from Degussa were tested and the results reveal lower yields than our systems (45% MB and 15% MOIL 1 h). Kaolinite could promote the dispersion of TiO2 on the clay surface allowing a fast degradation of dyes. This effect was confirmed by comparison of the results from isolated components (titanium oxide and kaolinite) and titanium oxide-kaolinite nanocomposites. (C) 2014 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/50216-0 - New clay-based materials with advanced technological and environmental applications
Grantee:Katia Jorge Ciuffi Pires
Support Opportunities: Regular Research Grants
FAPESP's process: 11/17660-8 - Study of the Catalytic Properties of Co2+, Mn2+ and Ni2+ Dipicolinate Complexes Immobilized on Kaolinite.
Grantee:Francielle Rodrigues Araújo
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 13/19523-3 - Functional Biohybrid materials based on layered and/or fibrous natural clays with multifaceted applications
Grantee:Emerson Henrique de Faria
Support Opportunities: Regular Research Grants