Titania sols as precursors in sol-gel technologies of composite materials for photocatalysis, electrorheology, sorption

Murashkevich, A. N.; Alisienok, O. A.; Zharskiy, I. M.; Novitskaya, M. S.; Федорова, О. В.; Maximovskikh, A. I.

doi:10.1007/s10971-019-04981-w

Cited by 4 publications

(9 citation statements)

References 36 publications

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“…There are significant shape differences between the modified and unmodified nanosilica at the range of 1750 to 500 cm −1 . SS has a characteristic peak at 720 cm −1 , which indicates more than four adjacent –CH 2 – groups [ 34 , 43 ], and a stretching vibration peak at 1300 cm −1 belongs to a carbon skeleton of C–C. The more complex circumstance shown in the KH–570 spectrogram has a miscellaneous peak, resulting in a great contrast with the raw silica.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, vapor leakage happens when the adjacent foam coalesces or rearranges, promoting the gas transfer rate and the formation of vacant sites. By adding photocatalytic nanoparticles to the foam solution, the foam membrane was mechanically strengthened and endowed with photocatalytic function [ 34 , 48 ]. Bi-functional foam can make up for the lack of barrier capacity in single liquid film.…”

Section: Resultsmentioning

confidence: 99%

“…As a novel vapor recovery material, nano titanium dioxide(nano-TiO 2 ) possesses the capacity to decompose VOCs because of its photocatalysis performance [ 33 ]. In a bench-scale experiment, a SiO 2 core–TiO 2 shell composite nanoparticle was shown to enhance the photocatalysis of nano-TiO 2 [ 34 ]. These composite particles are widely used in the environmental or medical fields, have been proven to contain no toxicity, and have no risk of causing secondary pollution [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

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SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2 nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2 nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2 nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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“…Due to its unique properties, nanosized TiO 2 is widely used as a photocatalyst for the decomposition of organic pollutants and inhibitors of microorganisms [37,38]. The widespread use of TiO 2 is based on its effective photocatalytic activity [39][40][41] and high chemical stability [42][43][44]. In works [42][43][44][45][46][47][48], its antibacterial efficacy under the influence of UV radiation has been studied.…”

Section: Introductionmentioning

confidence: 99%

“…To impart photocatalytic properties, TiO 2 must be synthesized under certain conditions and have a nanoscale structure. In [39][40][41], it has been shown that TiO 2 particles with sizes ranging from 10 to 50 nm have the highest photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and Biocidal Properties of Nickel–Tin and Nickel–Tin—Titania Coatings

Pyanko

Makarova

Kharitonov

et al. 2021

Prot Met Phys Chem Surf

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The morphology and composition of Ni-Sn and Ni-Sn-TiO 2 coatings have been studied by scanning electron microscopy and energy-dispersive X-ray analysis. The electrochemical behavior of the obtained coatings in a 3% NaCl solution has been examined. The influence of the inclusion of titania in the Ni-Sn coating on the mechanical and antibacterial properties has been revealed. Dependences of the influence of incubation time and exposure to UV radiation on the concentration of living bacteria cells on the surface of the Ni-Sn-TiO 2 coating have been established. In bacterial tests with Ni-Sn-TiO 2 coatings deposited from the electrolyte containing 2 g/L TiO 2 , the concentration of viable Staphylococcus aureus decreases from 130 to 90 CFU/mL and from 70 to 30 CFU/mL without and with UV irradiation, respectively.

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Breathable Films with Self-Cleaning and Antibacterial Surfaces Based on TiO2-Functionalized PET Membranes

Alisiyonak,

Lavitskaya,

Khoroshko

et al. 2023

Membranes

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A promising approach that uses the sol–gel method to manufacture new breathable active films with self-cleaning and antibacterial surfaces is based on the PET membranes obtained via ion track technology with a pore density of 10–7 cm−2 and a pore diameter of about 500 ± 15 nm, coated with a layer of TiO2 anatase, with a thickness of up to 80 nm. The formation of the photocatalytically active TiO2 anatase phase was confirmed using Raman analysis. Coating the PET membrane with a layer of TiO2 increased the hydrophobicity of the system (CA increased from 64.2 to 92.4, and the antibacterial activity was evaluated using Escherichia coli and Staphylococcus aureus bacteria with the logarithmic reduction factors of 3.34 and 4.24, respectively).

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Titania sols as precursors in sol-gel technologies of composite materials for photocatalysis, electrorheology, sorption

Cited by 4 publications

References 36 publications

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Physicochemical and Biocidal Properties of Nickel–Tin and Nickel–Tin—Titania Coatings

Breathable Films with Self-Cleaning and Antibacterial Surfaces Based on TiO2-Functionalized PET Membranes

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