Synthesis and characterization of thermally stable large-pore mesoporous nanocrystallineanatase

Ermokhina, N. I.; Nevinskiy, Vitaly A.; Manorik, P. A.; Ilyin, Vladimir G.; Novichenko, V. N.; Shcherbatiuk, М. М.; Klymchuk, D. O.; Tsyba, M.M.; Puziy, Alexander M.

doi:10.1016/j.jssc.2012.12.034

Cited by 15 publications

(11 citation statements)

References 58 publications

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“…1a, b). As seen from according to data in [25,26] are formed by the primary building blocks (particles of anatase measuring~10 nm). It was established that the MS-1 sample is characterized by an average pore size of 5 nm, a mesopore volume of 0.33 cm 2 /g, and a specific surface area of 84 m 2 /g.…”

Section: Resultsmentioning

confidence: 98%

“…The microporous TiO 2 microspheres were produced in a modification of the sol-gel method [25,26] by hydrolysis of titanium tetrabutoxide in butanol in the presence of the sodium dibenzo-18-crown-6 [Na(DB 18 C 6 )]Cl complex with (or without) the addition of a small amount of palmitic acid. (The need to use the complex arose from the low solubility of dibenzo-18-crown-6 in butanol.)…”

Section: Methodsmentioning

confidence: 99%

“…Earlier we proposed new approaches to the production of mesoporous nanocrystalline TiO 2 microspheres by using sol-gel synthesis in the presence of dibenzo-18-crown-6 as template together with hydrothermal treatment [25,26]. It was shown that the addition of a small amount of surfactant to the reaction mixture had a significant effect on the degree of crystallization, texture, and morphology of the TiO 2 samples.…”

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confidence: 99%

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Photocatalytic and Photoelectrochemical Characteristics of Mesoporous Titanium Dioxide Microspheres

et al. 2015

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It was established that the mesoporous microspheres with size of about 10 nm formed by anatase nanocrystals exhibit photocatalytic activity in the release of H 2 from water-ethanol mixtures and in the gas-phase oxidation of benzene by atmospheric oxygen. They are also active during the generation of current in a photoelectrochemical cell exposed to UV light or in TiO 2 /CdS heterostructures exposed to visible light. It was shown that the efficiency of the photoprocesses involving the mesoporous microspheres significantly exceeds that of nonporous nanocrystalline Evonik P25 TiO 2 . Possible reasons for the enhanced photoactivity of the microspheres are discussed.

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Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Photocatalytic and Photoelectrochemical Characteristics of Mesoporous Titanium Dioxide Microspheres

et al. 2015

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“…When studying the powder diffractograms, it is not possible to unambiguously identify the presence of anatase or brookite, the metastable and low-temperature polymorphs of TiO 2 , because of extreme broadening and subsequent overlap of diffraction peaks [see Figure 1(b)]. From the point-of-view of the application of the material, it is in general important to determine which of the TiO 2 polymorphs is present, particularly anatase because of its high photocatalytic activity (Ermokhina et al , 2013). This ambiguity is valid especially for sample 1.…”

Section: Resultsmentioning

confidence: 99%

Characterizing nanoparticles with a laboratory diffractometer: from small-angle to total X-ray scattering

Sommariva¹,

Gateshki²,

Gertenbach³

et al. 2014

Powder Diffr.

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X-ray diffraction and scattering on a single multipurpose X-ray platform have been used to probe the structure, composition, and thermal behavior of TiO2 nanoparticles ranging in size from 1 to 10 nm. Ambient and non-ambient Bragg diffraction, small-angle X-ray scattering (SAXS), as well as total scattering and pair-distribution function (PDF) analysis are combined to obtain a comprehensive picture of the samples. At these ultrasmall particle-size dimensions, SAXS and PDF prove powerful in distinguishing the salient features of the materials, in particular the size distribution of the primary particles (SAXS) and the identification of the TiO2 polymorphs (PDF). Structural features determined by X-ray scattering techniques are corroborated by high-resolution transmission electron microscopy. The elemental make-up of the materials has been measured using X-ray fluorescence spectrometry and energy-dispersive X-ray analysis.

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“…Earlier, under conditions of neutral hydrolysis, samples of thermally stable meso-nc-TiO 2 with a pure anatase structure were obtained [59][60][61][62][63], demonstrating different textures with well-defined spherical morphology (microand nanospheres) and a narrow pore distribution. Calcined at 500 °C after hydrothermal treatment at 175 °C TiO 2 samples had a radically more developed porous structure compared to samples without hydrothermal treatment [59].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

et al. 2021

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Different phase compositions of mesoporous nanocrystalline TiO2 (meso-nc-TiO2), comprised of anatase (16–100%), rutile (0–70%) and brookite (0–52%) were obtained by sol–gel synthesis with or without hydrothermal treatment (HTT) by means of titanium tetrabutoxide and dibenzo-18-croun-6 as structure-forming agent in the presence of HCl. It was shown, that small amounts of surfactant and/or lanthanum salt as well as HTT determine phase composition and texture of meso-nc-TiO2. All samples were calcined at 500 оС and characterized by SEM, TEM, XRD and N2-adsorption/desorption isotherms. It has been established that photocatalytic properties of almost all obtained samples significantly exceed the photocatalytic activity of Evonik P-25 TiO2 in gas phase ethanol oxidation. The most active sample is characterized by phase composition of anatase (97%)-rutile (3%). It is obvious, that decrease of photocatalytic activity of sample was affected by decrease of anatase phase content. It was shown that the specific surface area of the sample is not a key factor affecting the activity of mixed-phase meso-nc-TiO2 samples in the process of ethanol oxidation.

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Synthesis and characterization of thermally stable large-pore mesoporous nanocrystallineanatase

Cited by 15 publications

References 58 publications

Photocatalytic and Photoelectrochemical Characteristics of Mesoporous Titanium Dioxide Microspheres

Photocatalytic and Photoelectrochemical Characteristics of Mesoporous Titanium Dioxide Microspheres

Characterizing nanoparticles with a laboratory diffractometer: from small-angle to total X-ray scattering

Synthesis and characterization of different binary and ternary phase mixtures of mesoporous nanocrystalline titanium dioxide

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