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RESEARCH PRODUCT
Absolute crystallinity and photocatalytic activity of brookite TiO2 samples
Bartolomeo MegnaAgatino Di PaolaLeonardo PalmisanoMarianna Bellarditasubject
Materials scienceDiffuse reflectance infrared fourier transformScanning electron microscopeInorganic chemistry02 engineering and technology010402 general chemistry01 natural sciencesCatalysisCrystallinitysymbols.namesakePhotocatalysiBrookitePhotodegradationCrystallinityGeneral Environmental ScienceBrookiteProcess Chemistry and Technology021001 nanoscience & nanotechnology0104 chemical sciencesFull width at half maximumSettore ING-IND/22 - Scienza E Tecnologia Dei Materialivisual_artPhotocatalysisvisual_art.visual_art_mediumsymbolsCalcinationSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie0210 nano-technologyRaman spectroscopyNuclear chemistrydescription
Abstract This study reports a method to determine the absolute crystallinity of partly crystalline brookite TiO2 photocatalysts. A natural, a commercial and various home-prepared brookite powders were characterized by X-ray diffraction analysis, Raman spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectroscopy and nitrogen adsorption measurements. The absolute crystallinity was calculated from the ratio between the full width at half maximum intensity of the (121) X-ray diffraction peaks of the brookite samples and the (111) peak of CaF2 as internal standard. The photocatalytic activity of the powders was tested employing the photodegradation of 4-nitrophenol as well as the selective oxidation of 4-methoxybenzyl alcohol to 4-methoxybenzaldehyde (p-anisaldehyde) under UV irradiation. The results indicated that crystallinity positively influenced the photooxidation of 4-nitrophenol and 4-methoxybenzyl alcohol but reduced the selectivity toward the synthesis of p-anisaldehyde.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-01 |