Preparation, physicochemical properties and antimicrobial activity of η-modification of titanium(IV) oxide intercalated with poly(N-vinylcaprolactam)

Тимаева, О. И.; Chihacheva, I. P.; Кузьмичева, Г. М.; Safyanova, L. V.; Chumakov, Ratibor G.; Терехова, Р. П.

doi:10.1007/s13204-018-0848-z

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…The maximum total acidity of NA/HZSM(12)-1 and NA/HZSM(25)-1 indicates the effect of NA in the composition of nanocomposites obtained by Method 1b on their acidic properties. According to [13,41] on the NA surface there are Lewis acid sites, enhancing the nearby Bronsted sites, provoking an increase in the selectivity for hydrocarbons in reactions proceeding via the redox mechanism.…”

Section: Hzsm(12)mentioning

confidence: 99%

“…NOT samples are considered mainly as a support [38] or promoter [39] for nitrous oxide decomposition. Antimicrobial activity of the samples with NOT with respect to bacteria Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Bacillus antracoides, and fungi Candida albicans is known, which is determined by both physicochemical properties of NOT modifications (the samples with NA prepared by hydrolysis of TiOSO 4 × xH 2 SO 4 × yH 2 O are most active with respect to Staphylococcus aureus, Escherichia coli, and Candida albicans [40], while the samples with η-phase (E) are most active with respect to Staphylococcus aureus [41,42]), and by the nature of bacteria and fungi. Photocatalytic and adsorption properties of NOT are conditioned by surface hydroxyl groups with high reaction activity, which are selfgenerated when contacting with water, which leads to high adsorption ability to extract Ni, Co, Sr, Zn, Ag, Cu, Hg, Cd, Tl, Pb, Mn, Rb, Cs, Sn, Cr, Sb, Al, V, As, P, Se, Te, Ta, U, and transuranic ions, regardless of the oxidation state, from aqueous systems, see, e.g., [43], and photocatalytic activity in an ultraviolet part of sunlight [44].…”

Section: Introductionmentioning

confidence: 99%

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Design of MFI Type Aluminum- and Titanium-Containing Zeolites

2021

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HZSM-5 (MFI type) of composition (Hx)[Al3+xSi12−xO24] × wH2O and nanocomposites NA/HZSM-5, NA:M/HZSM-5 (NA—nanoscale anatase; M = V, Ni, Ag) with Si/Al = 12, 25, 40, 300 (sp.gr. Pnma or P21/n; z = 8), as well as zeolites [(Ti4+xSi12−xO24] × wH2O (TS) with Si/Ti = 47, 53, 73.5 (sp.gr. Pnma) were studied by XRPD, XAS, FTIR-spectroscopy, BET, XPS, SEM, EDX, TPD, UV–VIS-spectroscopy, UV–DRS, and chemiluminescence methods. The results obtained together with photocatalytic, adsorption, antimicrobial, catalytic properties were analyzed using crystallochemical concepts and literature data. It was shown that NA or NA:M introduction into HZSM-5 leads, respectively, to the photodegradation of MeO dye in the UV region or difenoconazole in the visible range, and contributes to the appearance in the dark of adsorption (almost complete extraction of P(V), As(V), and Se(V) from aquatic environment) and bacteriostatic properties in respect to Staphylococcus epidermidis, Bacillus antracoides, and Escherichia coli for NA:Ag/HZSM-5(40, 300). The presence of titanium ions in NA nanoparticles on the HZSM-5 surface improves the catalytic activity in ethanol and propane (the best performance for NA/HZSM-5(25) and NA/HZSM-5(40), respectively) conversion. Determination of the composition (surface and bulk) and structure (statistical and local) of TS zeolites together with the found correlations made it possible to propose new catalysts in the reactions of propane, ethanol, and allyl chloride conversion.

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Section: Hzsm(12)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

2021

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Antimicrobial Activity of Composite Hydrogels in the Poly(N-vinylpyrrolidone)–RE(NO3)3 · xH2O (RE Are Rare-Earth Ions) System

et al. 2020

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Impact of the production method and diagnostics conditions on the compositions and structure of nanodimensional anatase

Тимаева¹,

Николайчик

Светогоров

et al. 2020

Zeitschrift Für Kristallographie - Crystalline Materials

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The detail investigation of the samples with nanodimensional anatase, formed by hydrolysis of TiOSO4 × xH2O without or in the presence of polymer poly(N-vinyl caprolactam), physical precipitation of the polymer followed by the capture of commercial Hombifine N are performed by X-ray powder diffraction using laboratory and synchrotron radiation sources, transmission electron microscopy with the diffraction, and elemental analysis. The two «core»-«shell» models with nanoparticles and their associates as a core can be applied to samples produced. The synchrotron and electron radiation change the degree of crystallinity and the imperfection of anatase, isolate of TiO2−x(OH)2x × yH2O from the nanoparticle shell with a decrease in its thickness, lead to the anatase – rutile phase transition. The double diffraction effect on the appearance of kinematically forbidden reflections caused by the dynamic character of the electron diffraction. The photoactivity depends on microstructural characteristics (specific surface, nanoobjects sizes). The structure and elemental composition of nanoparticles (associates) affect antimicrobial activity against Staphylococcus aureus and Escherichia coli.

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Preparation, physicochemical properties and antimicrobial activity of η-modification of titanium(IV) oxide intercalated with poly(N-vinylcaprolactam)

Cited by 4 publications

References 33 publications

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

Design of MFI Type Aluminum- and Titanium-Containing Zeolites

Antimicrobial Activity of Composite Hydrogels in the Poly(N-vinylpyrrolidone)–RE(NO3)3 · xH2O (RE Are Rare-Earth Ions) System

Impact of the production method and diagnostics conditions on the compositions and structure of nanodimensional anatase

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