Influence of the conditions of the sulfate method on the characteristics of nanosized anatase-type samples

Obolenskaya, L. N.; Кузьмичева, Г. М.; Савинкина, Е. В.; Sadovskaya, N. V.; Zhilkina, A. V.; Prokudina, N. A.; Чернышев, Владимир В.

doi:10.1007/s11172-012-0286-0

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…The quantitative analysis was performed using the INCA Penta FET mathematical program for all elements with an atomic number >3. The repeatable accuracy of measurement results was 0.1% [25].…”

Section: Stepmentioning

confidence: 80%

Bactericidal properties of nanoscale zinc(II) and titanium (IV) oxides of different nature and their nanocomposites with polystyrene

Serkhacheva¹,

Yashina

Prokopov³

et al. 2016

Nanotechnol Russia

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The samples with nano-titanium dioxide (X-ray amorphous, η-modification, Degussa P25 mixture of rutile and anatase, Hombifine N, and Hombikat UV100 with anatase) and hexagonal nano-ZnO both in pure form and as a part of polystyrene (PS) nanocomposites were studied for antibacterial activity in the dark against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Bacillus antracoides, and Candida albicans microorganisms by the Kirby-Bauer disk diffusion method. Among the starting samples, ZnO exhibits ABA against all bacterial cultures in use; the sample with the η-phase exhibits ABA against Staphylococcus aureus, Staphylococcus epidermidis, and Bacillus antracoides; the X-ray amorphous TiO 2 exhibits ABA against Staphylococcus aureus and Candida albicans; and the remaining samples have no ABA. The diameters of the microbial growth retardation zone for the η-phase/PS, X-ray amorphous TiO 2 /PS, and ZnO/PS nanocomposites were found to be less than those for the starting oxides; the range of microbes inhibited by ZnO/PS was smaller since it exhibited no ABA against Candida albicans, while such activity remained in the X-ray amorphous TiO 2 /PS nanocomposite.

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Section: Stepmentioning

confidence: 80%

Bactericidal properties of nanoscale zinc(II) and titanium (IV) oxides of different nature and their nanocomposites with polystyrene

Serkhacheva¹,

Yashina

Prokopov³

et al. 2016

Nanotechnol Russia

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“…Scanning electron microscopy (SEM) studies were carried out on a high-resolution JSM 7500F electron microscope using the procedures described by Obolenskaya et al (2012).…”

Section: Methodsmentioning

confidence: 99%

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

et al. 2018

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Zeolite Y and the NTD/Y nanocomposite, which were synthesized in situ (the addition of zeolite Y to the reaction mixture in the course of the synthesis of NTD by the sulfate method), were studied by a variety of methods. The decrease in the particle size (scanning electron microscopy) and the water content in pores (X-ray powder diffraction study, the full-profile Rietveld method, IR spectroscopy, differential scanning calorimetry), the increase in OH groups content and the decrease in the water content on the surface of zeolite (X-ray photoelectron spectroscopy) in the composition of NTD/Y compared to the initial zeolite Y were all established. A larger specific surface area of NTD/Y (Brunauer-Emmet-Teller method) compared to the initial zeolite Y is due to the fact that zeolite Y in the nanocomposite contains a smaller amount of water because of the synthesis conditions and the presence of nanocrystalline NTD on the surface of zeolite particles. It was found that NTD/Y nanocomposite exhibits a higher photocatalytic activity in the model decomposition reaction of methyl orange under UV and adsorption capacity for the extraction of P(V) and As(V) ions from aqueous media compared to the initial zeolite and pure NTD obtained under the same conditions, which differs from NTD/Y by the larger particle size, the smaller specific surface and the smaller content of OH groups and water on the surface. The role of Bronsted and Lewis centers in the realization of properties is discussed.

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“…Quantita- tive analysis was performed using the INCA Penta FET mathematical program for all elements with atomic number >3. The limit of repeatability of the results was 0.1% [17]. For the analysis of photographs obtained by SEM, the authors developed a specialized program.…”

Section: Objects and Methods Of Studymentioning

confidence: 99%

“…On kinetic curves of the photocatalytic decomposition reaction of MeO in the presence of all obtained nanocomposites of TiO 2 (TiO 2 +HD)/SiO 2 (upon irradiation both in the UV and in the visible range), the induction period characteristic of kinetic curves of MeO photodecomposition in the presence of the samples with η-modification, including with HD impurity, is absent [17,[22][23][24]. This can be explained by a higher value of the specific surface area of silicate carriers compared with the samples composed of only η-modification+HD [24].…”

Section: Methodsmentioning

confidence: 99%

“…In addition to the composition, samples with SiO 2 differ in the characteristics of the microstructure (lowest specific surface, determined by the comparative method [17], and the pore sizes for OP, and the largest for GR). The average crystallite sizes of them are about the same, a little more for granular (GR) SiO 2 ( Table 3).…”

Section: Characterization Of Initial Samples and Nanocompositesmentioning

confidence: 99%

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Nanocomposites based on silicon dioxide of different nature with functional titanium dioxide nanoparticles

Obolenskaya¹,

Gaynanova²,

Kravchenko³

et al. 2016

Nanotechnol Russia

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Nanocomposites TiO 2 /SiO 2 with photocatalytic and adsorptive properties were prepared by codispersing of η-modification and anatase (commercial Hombifine N) and SiO 2 (opal, granules, ultrafine) in ethanol (or ethanol-water mixture in the presence of chlorophylls or porphyrins) with ultrasonic treatments of the mixture (method 1) and an aqueous solution of KOH with a microwave treatment (method 2), as well as the introduction of SiO 2 in the reaction mixture during the synthesis of TiO 2 by brief hydrolysis of sulfate titanyl (method 3). It was found that the state of titania in the sample (X-ray amorphous or nanocrystalline) and its deposition on SiO 2 nanocomposites depend on the method and the conditions of obtaining. It was established that the photocatalytic activity of nanocomposite TiO 2 /SiO 2 (granules) (method 1) photosensitized by coproporphyrin I in the visible range and the photocatalytic activity of nanocomposite TiO 2 /SiO 2 (opal) (method 3) in the near UV range exceed activity of the commercial sample of TiSiO 4 by more than 20-fold and ~7-fold, respectively. It was shown that the nanocomposite TiO 2 /SiO 2 (opal) significantly reduces the concentration of cations (in particular, Be, Ni, Bi) in the model water systems.

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Influence of the conditions of the sulfate method on the characteristics of nanosized anatase-type samples

Cited by 13 publications

References 7 publications

Bactericidal properties of nanoscale zinc(II) and titanium (IV) oxides of different nature and their nanocomposites with polystyrene

Bactericidal properties of nanoscale zinc(II) and titanium (IV) oxides of different nature and their nanocomposites with polystyrene

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

Nanocomposites based on silicon dioxide of different nature with functional titanium dioxide nanoparticles

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