Effect of surface fluorination of P25-TiO2 on adsorption of indoor environment volatile organic compounds

Shayegan, Zahra; Haghighat, Fariborz; Lee, Chang-Seo; Bahloul, Ali; Huard, Mélanie

doi:10.1016/j.cej.2018.04.043

Cited by 51 publications

(10 citation statements)

References 53 publications

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“…The lifetime of photogenerated charge carriers in the anatase phase is longer than that of rutile and brookite phases . However, many of the commercial TiO 2 products available in the market have a mixture of ∼80% anatase and ∼20% rutile phases (e.g., Degussa P25). , It is perceived that a mixed-phase composition of TiO 2 with a high percentage of anatase (more than ∼60%) would reduce the charge carrier recombination process and enhance the photocatalytic efficiency . Therefore, TiO 2 anatase could be used as an excellent additive in the manufacturing of building materials (especially ceramic tiles, sanitary ware, and glass) for indoor air purification, antimicrobial coatings, and self-cleaning surfaces under normal room light illumination. − However, most of these indoor building materials are processed and manufactured at high temperatures in the range of 600–1000 °C.…”

Section: Introductionmentioning

confidence: 99%

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Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability

et al. 2019

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The thermal stability of anatase titanium dioxide (TiO2) is a prerequisite to fabricate photocatalyst coated indoor building materials for use in antimicrobial and self-cleaning applications under normal room light illumination. Metal doping of TiO2 is an appropriate way to control the anatase to rutile phase transition (ART) at high processing temperature. In this present work, ART of indium (In) doped TiO2 (In-TiO2) was investigated in detail in the range of 500 °C -900 °C. In-TiO2 (In mol % = 0 to 16) was synthesized via a modified solgel approach. These nanoparticles were further characterized by means of powder X-ray diffraction (XRD), Raman, photoluminescence (PL), transient photocurrent response, and Xray photoelectron spectroscopy (XPS) techniques. XRD results showed that the anatase phase was maintained up to 64 % by 16-mol % of In doping at 800 °C of calcination temperature.XPS results revealed that the binding energies of Ti 4+ (Ti 2p1/2 and Ti 2p3/2) were red-shifted by In doping. The influence of In doping on the electronic structure and oxygen vacancy formation of anatase TiO2 was studied using density functional theory corrected for on-site Coulomb interactions (DFT+U). First principles results showed that the charge compensating oxygen vacancies form spontaneously at sites adjacent to the In dopant. DFT+U calculations revealed the formation of In -5s states in the band gap of the anatase host. The formation of In2O3 at the anatase surface was also examined using a slab model of the anatase (101)

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Section: Introductionmentioning

confidence: 99%

“…However, many of the commercial TiO2 products available in the market have a mixture of ~80 % anatase and ~20 % rutile phases (e.g. Degussa P25) 17,18 . It is perceived that a mixed phase composition of TiO2 with a high percentage of anatase (more than ~ 60 %) would reduce the charge carrier recombination process and enhance the photocatalytic efficiency 19 .…”

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confidence: 99%

Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability

et al. 2019

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“…53 However, these results have been obtained in aqueous suspensions, where the adsorbent−surface interactions are highly dependent on the presence of water and the operating pH. On the other hand, the influence of water on the adsorption of organic molecules in gas phase onto fluorinated P25 has been highlighted by Shayegan et al 54 Authors were able to reveal that in the absence of water, substituting the terminal hydroxyl groups with fluorine groups increases the P25 adsorption capability toward π-systems due to the formation of Lewis acid sites on titanium atoms which are close to highly electronegative fluorine groups. 54−56 Importantly, the authors observed that the presence of water strongly reduced this effect by quenching the Lewis sites.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Toward a Sustainable Photocatalytic Oxidative Cleavage of Olefins Mediated by Nitrate Radicals: The Influence of the Physicochemical Features of the Photocatalyst

Gottuso,

Parrino

2024

J. Phys. Chem. C

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The nitrate radical-mediated photocatalytic oxidative cleavage of the internal double bond of limonene to limononaldehyde was studied with respect to some of the features of different TiO2 photocatalysts. In particular, the influence of crystallinity, surface hydroxylation degree, surface modification, availability and potential of the photogenerated charges, and nitrate adsorption have been investigated by correlating them with the reaction selectivity. Results obtained from independent experiments show that the interaction of the organic molecules with the surface does not significantly influence the selectivity of the reaction, unlike what has been reported in the literature for other photocatalytic syntheses. On the other hand, the selectivity of the reaction is mainly influenced by the efficiency of the primary events of interfacial electron transfer, i.e., nitrate oxidation and silver reduction. Results highlight the key parameters to be modulated in order to design sustainable and selective olefin transformation to carbonyl compounds, whose actual industrial implementation is still far from being performed under green conditions.

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“…[25] P25 titania is the mixture of rutile and anatase crystalline phases with 3:1 ratio (21 nm in diameter on average), which has been extensively used in the heterogeneous photocatalytic redox process. [26,27] Significantly, mixcrystal P25 titania has conspicuous UV absorption and photocatalyst activity than single-crystal ones because the generation of transition points and catalytic "hot spots" between two phases allow rapid electron transfer, prominently decreasing its band gap. [28,29] Therefore, P25 titania is regarded as a better choice of acting as designer matrix materials of LDI-MS.…”

Section: The Performance Of Designer Titania-assisted Ldi-ms In Metab...mentioning

confidence: 99%

Investigation of Urinary Exosome Metabolic Patterns in Membranous Nephropathy by Titania‐Assisted Intact Exosome Mass Spectrometry

Chen

Zhang

et al. 2022

Small Science

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Exosomes are regarded as the emerging potential targets for liquid biopsy and bioprocess study owing to their abundant inclusive cargos that carry significant disease information. In addition, metabolites have been promising biomarkers for diagnosis. However, little metabolic research on exosomes is carried out by now. Herein, the mix‐crystal titania‐assisted laser desorption/ionization mass spectrometry (LDI‐MS) method is established, which features fast speed, high throughput, and efficiency, to directly extract urinary exosome metabolic patterns of healthy controls (HC) and membrane nephropathy (MN) patients. Besides, this method is also adopted to acquire the primitive urinary metabolic patterns from the same samples for comparison. By taking advantage of principal component analysis, unpaired parametric t‐test, and orthogonal partial least squares discriminant analysis on the exosome metabolic patterns, 27 significant m/z signals are filtrated, which possess more prominent differentiation capacity toward HC and MN patients (AUC = 0.942), and hold greater potential in MN diagnosis, compared to primitive urine (AUC = 0.801). The work reveals the important clinical value of exosome metabolic analysis, and paves a way to exosome‐based diagnosis at metabolomic level toward large‐scale clinical use.

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Effect of surface fluorination of P25-TiO2 on adsorption of indoor environment volatile organic compounds

Cited by 51 publications

References 53 publications

Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability

Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability

Toward a Sustainable Photocatalytic Oxidative Cleavage of Olefins Mediated by Nitrate Radicals: The Influence of the Physicochemical Features of the Photocatalyst

Investigation of Urinary Exosome Metabolic Patterns in Membranous Nephropathy by Titania‐Assisted Intact Exosome Mass Spectrometry

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Effect of surface fluorination of P25-TiO2 on adsorption of indoor environment volatile organic compounds

Cited by 51 publications

References 53 publications

Indium-Doped TiO2 Photocatalysts with High-Temperature Anatase Stability

Indium-Doped TiO2 Photocatalysts with High-Temperature Anatase Stability

Toward a Sustainable Photocatalytic Oxidative Cleavage of Olefins Mediated by Nitrate Radicals: The Influence of the Physicochemical Features of the Photocatalyst

Investigation of Urinary Exosome Metabolic Patterns in Membranous Nephropathy by Titania‐Assisted Intact Exosome Mass Spectrometry

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Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability

Indium-Doped TiO₂ Photocatalysts with High-Temperature Anatase Stability