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Journal of Sol-Gel Science and Technology

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18.12.2018 | Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications

Novel and inexpensive Nb₂O₅/tannin-formaldehyde xerogel composites as substitutes for titanium dioxide in photocatalytic processes

verfasst von: Nicolas Perciani de Moraes, Leticia Araujo Bacetto, Livia Kent Paiva, Gabriela Spirandelli dos Santos, Maria Lucia Caetano Pinto da Silva, Liana Alvares Rodrigues

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 2/2019

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Abstract

This project studied the preparation of new Nb₂O₅/tannin-formaldehyde xerogel composites (XTF-wNb) for photocatalytical applications. The choice of tannin biomass and niobium recycled scraps as precursors is aimed at reducing costs and environmental impacts. The composites were characterized by diffuse reflectance spectroscopy (DR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), infrared spectroscopy (IR), and X-ray diffraction (XRD). The photocatalytic properties of the composites were evaluated by methylene blue decomposition. The influence of the catalyst dosage and the initial concentration of dye in the adsorption and photocatalysis processes were studied. The X-ray profiles of the XTF-wNb show the presence of niobic acid in the structure of the materials, proving the presence of the inorganic oxide in the matrix of these composites. The tannin/Nb ratio had a significant influence on the morphology of the formed composites, causing changes in the shape and size of the particles composing each material. All materials have pH_PZC < 5. The XTF-24Nb was the most effective photocatalyst, its photocatalytic efficiency superior to the one of titanium dioxide, evidencing the beneficial effect of the xerogel coupling on the photocatalytic properties of the material.

Vorheriger Artikel Synthesis of N-F-codoped TiO2/SiO2 nanocomposites as a visible and sunlight response photocatalyst for simultaneous degradation of organic water pollutants and reduction of Cr (VI)

Nächster Artikel Solution combustion synthesis of ZnO powders using various surfactants as fuel

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Titel: Novel and inexpensive Nb2O5/tannin-formaldehyde xerogel composites as substitutes for titanium dioxide in photocatalytic processes
verfasst von: Nicolas Perciani de Moraes
Leticia Araujo Bacetto
Livia Kent Paiva
Gabriela Spirandelli dos Santos
Maria Lucia Caetano Pinto da Silva
Liana Alvares Rodrigues
Publikationsdatum: 18.12.2018
Verlag: Springer US
Erschienen in: Journal of Sol-Gel Science and Technology / Ausgabe 2/2019
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-018-4905-6

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