0000000000529737

AUTHOR

Jacinto Sá

showing 2 related works from this author

Highly stable defective TiO2-x with tuned exposed facets induced by fluorine: Impact of surface and bulk properties on selective UV/visible alcohol p…

2020

Abstract Titanium dioxide samples were prepared in the presence of different amounts of fluorine via hydrothermal method. It has been found that the presence of fluoride influenced the physico-chemical properties of TiO2 in various ways as polymorphic form stability, surface hydroxylation, generation of hydroxyl radicals under irradiation and formation of Ti3+ centers and oxygen vacancies. The generation rate of OH radicals was investigated by the photoluminescence technique in the presence of terephthalic acid. X-ray diffractometry indicated that fluorine stabilized the anatase TiO2. X-Ray photoelectron spectroscopy (XPS) revealed the presence of fluorine on the surface and the shift of th…

AnataseRadical2General Physics and Astronomychemistry.chemical_elementPhotochemistry)law.inventionchemistry.chemical_compoundX-ray photoelectron spectroscopylawTiOFluorine effectIrradiationElectron paramagnetic resonanceStructural and morphological TiOChemistrySurfaces and InterfacesGeneral ChemistryOH radicals generation rateTitanium dioxide (TiOCondensed Matter PhysicsSurfaces Coatings and Films2-Propanol and 4-Methoxybenzyl alcohol photo-oxidationTitanium dioxidefacetPhotocatalysisFluorinecontrol[rad]Applied Surface Science
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Selective photocatalytic oxidation of 3-pyridinemethanol on platinized acid/base modified TiO2

2021

TiO2 catalysts, modified with acidic or alkaline solutions and then platinized, were used for the partial photocatalytic oxidation of 3-pyridinemethanol to 3-pyridinemethanal and vitamin B-3 under environmentally friendly conditions. The reaction took place in water under UVA light and air oxygen. Catalysts were characterized by TEM, photoluminescence, DRIFT-IR, Raman, DRS, XPS, and photocurrent measurements. The photocatalytic activity results show that Pt loading of untreated samples leads to a significant activity improvement (hence product yield) as much as acid and alkaline treatments do. Moreover, the alkaline treated TiO2 samples exhibit a further increase in activity after loading w…

chemistry.chemical_classificationPhotocurrentElectron transferchemistryX-ray photoelectron spectroscopyBase (chemistry)Photocatalysischemistry.chemical_elementThermal stabilityOxygenCatalysisNuclear chemistryCatalysis
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