Doping TiO2 with p-block elements: Effects on photocatalytic activity

Dozzi, Maria Vittoria; Selli, Elena

doi:10.1016/j.jphotochemrev.2012.09.002

Cited by 363 publications

(170 citation statements)

References 178 publications

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“…The role played by N in doped titania is controversial. Hence, even if N-doped TiO 2 materials may absorb visible light, some authors claimed that they are frequently inactive in photooxidation reactions under visible light irradiation (Dozzi and Selli 2013). Similarly to the results found in this work, under visible light irradiation, the quantum yield of isopropanol decreased with increasing the dopant N content, a fact that was attributed to the parallel increased formation of oxygen vacancies, acting as recombination centres for photoproduced electron-hole couples (Irie et al 2003).…”

Section: Resultssupporting

confidence: 81%

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Rivas

Solís

Gimeno

et al. 2013

Int. J. Environ. Sci. Technol.

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An attempt to synthesize an active photocatalyst for 2-methyl-4-chlorophenoxyacetic acid removal has been accomplished. Black light (main emission wavelength at 365 nm) photocatalytic experiments with bare and N-doped titania have been carried out, and the results compared to those obtained in the presence of titania Degussa P-25. Doping percentage and calcination temperature influences have been investigated in photocatalytic runs using pure and commercial 2-methyl-4-chlorophenoxyacetic acid. In no case, the results obtained with synthesized titania improved the activity of P-25. Some kinetic tests allowed for the proposal of a pseudoempirical reaction mechanism capable of acceptably simulating the process in the presence of P-25. From the proposed mechanism, the roles played by hydroxyl, peroxyl and organic radicals have been suggested.

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Section: Resultssupporting

confidence: 81%

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Rivas

Solís

Gimeno

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Doping, in particular with non-metal elements [51], is an important strategy for modifying the electronic band structure and the response to light of TiO 2 -based photocatalytic materials. The current bottleneck in introducing visible light activity by doping is that well-faceted anatase TiO 2 crystals, obtained in fluorine-rich ambient, usually have very high crystallinity, making the inclusion of dopant species into the structural framework difficult or nearly impossible by mild post-treatments.…”

Section: Doped Anatase Tio 2 With Large Percentage Of {001} Facetsmentioning

confidence: 99%

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

2013

Self Cite

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Semiconductors crystal facet engineering has become an important strategy for properly tuning and optimizing both the physicochemical properties and the reactivity of photocatalysts. In this review, a concise survey of recent results obtained in the field of specific surface-oriented anatase TiO 2 crystals preparation is presented. The attention is mainly focused on the fluorine-mediated hydrothermal and/or solvothermal processes employed for the synthesis and the assembly of anatase micro/nanostructures with dominant {001} facets. Their peculiar photocatalytic properties and potential applications are also presented, with a particular focus on photocatalysis-based environmental clean up and solar energy conversion applications. Finally, the most promising results obtained in the engineering of TiO 2 anatase crystal facets obtained by employing alternative, possibly more environmentally friendly methods are critically compared.

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“…Secondly, the recombination of photoexcited charge carriers (electron (e -)-holes (h + )), which reduces quantum efficiency, has not been controlled [3]. Many studies have been performed to obtain visible light activity by modification of titania with metal and non-metal elements [4][5][6][7]. The second limitation can be overcome by surface modification of titania with noble metals and their compounds that inhibit the charge recombination by increasing the transfer of photoexcited electrons from titania to substrates [5,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Janczarek

Kowalska

Ohtani

2016

Chemical Engineering Journal

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Decahedral-shaped anatase particles (DAPs) were prepared by a gas-phase process consisting of titanium(IV) chloride oxidation. The use of a coaxial-flow gas-phase reactor resulted in high reaction yield (ca. 70%) and good reproducibility of DAPs production. The influence of controlled and resultant preparation parameters on the process course and on DAPs properties (such as specific surface area, particle size and particle morphology) is discussed in detail.Correlations between preparation parameters and product properties indicated the best conditions for obtaining DAPs of high quality and thus with a high level of photocatalytic activity for various reaction systems.Keywords: anatase titania, decahedral-shaped particles, gas-phase synthesis, coaxial-flow reactor, photocatalytic activityconcentration of TiCl 4 vapor in gas phase (vol%) amount of powder collected from the glassfiber filter (g) length of the reaction zone (m) line speed ratio of reactant gases internal pressure (kPa) particle aspect ratio primary particle size (nm) particle shape distribution (%) particle size heterogeneity radial distance (m) reaction tube radius (m) Reynolds numbersecondary particle size (nm) specific surface area (m 2 g -1 ) amount of powder collected from the reaction tube (g) furnace temperature (K) residence time (s) average volumetric flow rate of the gas mixture (m 3 s -1 ) volumetric flow rate of argon (m 3 s -1 ) volumetric flow rate of oxygen (m 3 s -1 ) volumetric flow rate of TiCl 4 vapor (m 3 s -1 ) volumetric flow rate of TiCl 4 liquid (m 3 s -1 ) viscosity of the gas mixture (Pa s) density of the gas mixture (kg m -3 )

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Doping TiO2 with p-block elements: Effects on photocatalytic activity

Cited by 363 publications

References 178 publications

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Specific Facets-Dominated Anatase TiO2: Fluorine-Mediated Synthesis and Photoactivity

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

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