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Influence of fluorine in the synthesis of anatase TiO2 for photocatalytic partial oxidation: are exposed facets the main actors?

Abstract

Anatase TiO2 samples were synthesized in the presence of different amounts of HF acid with the aim to understand the effect of the fluorine presence on the photocatalytic activity. It is well known that the presence of fluoride ions influences the photocatalytic performance by adsorption on the surface of TiO2 and that they are capping agents in the control of specific exposed facets. The samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, nitrogen adsorption-desorption measurements, scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis spectrophotometry, and X-ray photoelectron spectroscopy (XPS) analyses. The photocatalytic activity was evaluated in gas-solid and liquid-solid systems by following the oxidation of 2-propanol and 4-methoxybenzyl alcohol, respectively. Some differences in the physico-chemical properties of the different samples were noticed; in particular, the presence of F- caused a net decrease of the specific surface area, an increase of the crystallinity degree and an increase of the conductivity, whilst only a slight difference was noticed in the distribution of the exposed anatase facets. Moreover, an increase of the total oxidation of 2-propanol and selectivity to 4-methoxybenzaldehyde was observed.

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Publication details

The article was received on 22 Nov 2017, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C7CY02382K
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Influence of fluorine in the synthesis of anatase TiO2 for photocatalytic partial oxidation: are exposed facets the main actors?

    M. BELLARDITA, C. Garlisi, A. M. Venezia, G. Palmisano and L. Palmisano, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7CY02382K

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