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1
Content available Some applications of barium titanate prepared by different methods
Sydorchuk Volodymyr, Khalameida Svitlana, Skwarek Ewa, Biedrzycka Adrianna
Physicochemical Problems of Mineral Processing
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2022
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Vol. 58, iss. 2
art. no. 147192
EN
The paper presents some application of barium titanate synthesized by different methods. Barium titanate samples were prepared by four procedures: solid state, mechanochemical as direct synthesis and modification as well as hydrothermal and microwave. The obtained samples were systematically studied using X-ray diffraction, nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR), potentiometric titration, and quasi-elastic light scattering and zeta potential measurements. The values of pHpzc (point of zero charge) and pHIEP (isoelectric point) characteristic of the electrical double layer were determined. The prepared samples were tested as photocatalysts under visible light. As a result, relationship between the conditions of barium titanate synthesis, its physicochemical and electrokinetic parameters, as well as photocatalytic activity under visible light was first established.
2
Content available remote CdO-Fe3O4 nanocomposite with enhanced magnetic and photocatalytic properties
Nallendran R., Selvan G., Balu A. R.
Materials Science Poland
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2019
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Vol. 37, No. 1
100--107
EN
Pure CdO nanopowder and CdO-Fe3O4 nanocomposite were synthesized by a cost effective chemical method, and the samples were characterized by XRD, SEM, TEM, FT-IR, UV-Vis-NIR and PL. Also, magnetic and photocatalytic properties of the synthesized samples were studied. XRD patterns of the composite confirm the presence of diffraction peaks related to both CdO and Fe3O4. EDX spectrum confirms the presence of the elements Cd, O and Fe in the composite. Peaks related to Cd–O and Fe–O bonds were observed respectively at 688 cm−1 and 592 cm−1 in the FT-IR spectrum. The paramagnetic behavior of pure CdO becomes ferromagnetic when coupled with Fe3O4. The composite exhibited a high photodegradation efficiency of 92.85 % against the degradation of methylene blue dye under visible light radiation.
3
Content available remote Search of methods for synthesizing photo-catalytically active layered perovskite-like phases of REE and transition elements
Dryuchko A. G., Storozhenko D. O., Bunyakina N. V.
Journal of New Technologies in Environmental Science
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2017
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Vol. 1, nr 4
158--164
EN
Complex layered perovskite-like oxides ALnTiO4, A2Ln2Ti3O10, ALnNb2O7, ALnTa2O7 (A - Li, Na, K, Rb, Cs, H; Ln - La, Nd) are crystalline compounds where layers of the perovskite structure are alternating with layers having different type of structure. Recently, the said phases have attracted significant attention due to their photo-catalytic properties [1, 2]. They can also be used as precursors to obtain other perovskite-like compounds by means of ion exchange or certain topochemical transformations. It was found that alkaline forms of such perovskites in the aqueous medium can perform replacement of cations by protons and hydration (rooting of water molecules in the interlayer space). These effects lead to substantial changes in physical and chemical properties of photo-catalysts. The composition of layered perovskite oxides may include several different metals [1-5], and depending on their nature and stoichiometry, these objects can display a wide range of physical and chemical properties. Normally, perovskite-like oxides are semiconducting materials.
4
Właściwości fotokatalityczne wielowarstwowych powłok antyrefleksyjnych
Wojcieszak D., Mazur M., Domaradzki J., Kaczmarek D., Placido F., Song S.
Elektronika : konstrukcje, technologie, zastosowania
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2014
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Vol. 55, nr 8
37-39
PL
W niniejszej pracy przedstawiono wyniki projektowania wielowarstwowej powłoki antyrefleksyjnej z dodatkową warstwą TiO2, której zadaniem było uzyskanie właściwości fotokatalitycznych. Wyniki pomiarów wielowarstwy wytworzonej metodą rozpylania magnetronowego wspomaganego mikrofalami na bazie TiO2i SiO2 pokazały, że powłoka ta miała takie parametry optyczne jak zaplanowano w projekcie. Poziom odbicia światła w zakresie od 430 do 760 nm był poniżej 1%, a w dla długości fali ok. 520 nm występowało tzw. odbicie resztkowe o zielonej barwie. Wyniki badań właściwości fotokatalitycznych pokazały także, że dzięki dodatkowej warstwie TiO2 powłoka ta była samoczyszcząca. Oprócz tego, charakteryzowała się ona jednorodną i gęsto upakowaną strukturą, a także miała właściwości hydrofobowe i oleofobowe. Z kolei badania odporności na zarysowania pokazały, że wielowarstwa ta miała również dużą odporność mechaniczną. Dlatego też można stwierdzić, że wytworzona powłoka może znaleźć praktyczne zastosowanie w konstrukcji paneli szklanych przeznaczonych do celów architektonicznych.
EN
In this paper the results of a multi-layer antireflection coating design with an additional layer of TiO2been presented. The measurement results of coating produced by microwave-assisted magnetron sputtering based on TiO2 and SiO2 have shown that the optical parameters were in good accordance with the project. The level of light reflection in the range of 430 to 760 nm was below 1%, and at wavelength of about 520 nm so called residual reflection of the green color occurred. The investigation of photocatalytic properties also revealed that with an additional film of TiO2 self-cleaning effect was obtained. Besides, the coating was characterized by a homogeneous and densely packed structure, and it had a hydrophobic and oleophobic properties. In turn, scratch resistance test showed that the multilayer had high mechanical resistance. Therefore, it can be concluded that manufatured coating may find practical application in the construction of glass panels for architectural purposes.
5
Content available remote Proekologiczna kostka brukowa
Gajewski J., Doering M., Mrozik Ł., Sakiewicz W.
Materiały Budowlane
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2013
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nr 12
14--15
6
Content available remote Preparation and photocatalytic activity of vanadium/silver doped TiO2 thin films obtained by sol-gel method
Nocun M., Kwasny S.
Optica Applicata
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2012
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Vol. 42, nr 2
323-336
EN
In our investigation, V/Ag doped TiO2 thin films were prepared on glass substrates. A thin film of SiO2 was prepared as a blocking layer by the dip coating sol-gel technique. A catalytic effect was investigated for obtained samples using Rhodamine B as a probe. Transmittances of the samples were characterized using a UV-VIS spectrophotometer. Subsequently band-gap energy (Eg) was estimated for these films. Chemical composition of the samples was studied by photoelectron spectroscopy (XPS). Powders obtained from sols were characterized by FTIR spectroscopy and X-ray diffraction (XRD).
7
Content available remote Evaluation of the Photocatalytic Properties of Textile Fabrics Modifed with Titanium Dioxide of Anatase Structute
Siwińska-Stefańska K., Ciesielczyk F., Jesionowski T., Sójka-Ledakowicz J., Lota W., Walawska A.
Fibres & Textiles in Eastern Europe
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2011
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Vol. 19, no. 2 (85)
76-83
EN
Te efect of surface modifcation with selected alkoxysilanes on the photocatalytic properties of TiO2 used in the reaction of formaldehyde photodegradation to UV radiation was investigated. Titanium dioxide - TytanpolŽ A-11, a pigment of anatase structure of the untreated surface, was used. Silane coupling agents were hydrolysed and then deposited directly on the surface of the TiO2. Te alkoxysilanes - 3-ethacryloxypropyltrimethoxysilane, vinyltrimethoxysilane or N-2-(aminoethyl)-3-aminopropyltrimethoxysilane were applied in the amounts of 0.5, 1 or 3 wt. parts per 100 wt. parts of TiO2. Te unmodifed and modifed titanium dioxide were used for the dip-coating of textile fabrics, and their photocatalytic properties were tested using UV radiation with TiO2 as a photocatalyst. Te results proved the very good photooxidative activity of TiO2 introduced into the structure of polyester fabric.
8
Preparation and Photocatalytic Properties of a Kind of Loaded Photocatalyst of Nanoscale CuO/ZnO Composite
Zhang D. F.
Polish Journal of Chemistry
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2009
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Vol. 83, nr 11
2009-2019
EN
The nanoscale CuO/ZnO composite photocatalysts were prepared via the wet chemical route. The detailed structural and physico-chemical properties of the obtained products were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectroscopy, FT-IR spectroscopy and fluorescence spectra. The vis i ble-light photocatalytic activity of CuO/ZnO nanocomposite was evaluated by employing the photodegradation of dye molecules (methyl orange, MO) as a probe reaction in aqueous solution. The effects of various parameters such as catalyst dosage and pH value of suspension on photocatalytic degradation efficiency of MO were investigated. The results indicate that the photocatalytic activity of CuO/ZnO nanocomposite is much better than that of commercial TiO2 photocatalyst and the photocatalytic ability of nanocomposite is almost not decreased after a four-cycle degradation of MO.
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