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Mesoporous Titania powders: the role of precursors, ligand addition and calcination rate on their morphology, crystalline structure and photocatalytic activity

Masolo, Elisabetta and Meloni, Manuela and Garroni, Sebastiano and Mulas, Gabriele Raimondo Celestino and Enzo, Stefano and Baró, Maria Dolores and Rossinyol, Emma and Rzeszutek, Agnieszka and Herrmann-Geppert, Iris and Pilo, Maria Itria (2014) Mesoporous Titania powders: the role of precursors, ligand addition and calcination rate on their morphology, crystalline structure and photocatalytic activity. Nanomaterials, Vol. 4 (3), p. 583-598. ISSN 1758-1745. eISSN 2079-4991. Article.

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DOI: 10.3390/nano4030583

Abstract

We evaluate the influence of the use of different titania precursors, calcination rate, and ligand addition on the morphology, texture and phase content of synthesized mesoporous titania samples, parameters which, in turn, can play a key role in titania photocatalytic performances. The powders, obtained through the evaporation-induced self-assembly method, are characterized by means of ex situ X-Ray Powder Diffraction (XRPD) measurements, N2 physisorption isotherms and transmission electron microscopy. The precursors are selected basing on two different approaches: the acid-base pair, using TiCl4 and Ti(OBu)4, and a more classic route with Ti(OiPr)4 and HCl. For both precursors, different specimens were prepared by resorting to different calcination rates and with and without the addition of acetylacetone, that creates coordinated species with lower hydrolysis rates, and with different calcination rates. Each sample was employed as photoanode and tested in the water splitting reaction by recording I-V curves and comparing the results with commercial P25 powders. The complex data framework suggests that a narrow pore size distribution, due to the use of acetylacetone, plays a major role in the photoactivity, leading to a current density value higher than that of P25.

Item Type:Article
ID Code:10189
Status:Published
Refereed:Yes
Uncontrolled Keywords:Titania, EISA method, powders, photocatalysis, water splitting
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:MDPIAG
ISSN:1758-1745
eISSN:2079-4991
Copyright Holders:© 2014 by the authors; licensee MDPI, Basel, Switzerland
Deposited On:14 Oct 2014 12:19

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