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Kadirova Z.C.,Academy of Sciences of Uzbekistan | Kadirova Z.C.,Tokyo Institute of Technology | Hojamberdiev M.,Tokyo Institute of Technology | Katsumata K.-I.,Tokyo Institute of Technology | And 5 more authors.
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering | Year: 2014

The spherical granular activated carbon-carbon composites (GAC-Fe) with different iron oxide contents (Fe mass% = 0.6-10) were prepared by a pore volume impregnation method. The X-ray diffraction (XRD), scanning electron microscopy (SEM), and N2-adsorption results confirm the presence of amorphous iron oxide, pyrolytic carbon, and graphitized globular carbon nanoparticles covered with amorphous carbon in the CAG-Fe. The rate of photodegradation of methylene blue (MB) in aqueous solution under UV light in the presence of oxalic acid correlates with porosity of the prepared materials. The total MB removal includes the combination of adsorption and photodegradation without the addition of H2O2. The results of total organic carbon (TOC) analysis reveal that the decolorization of MB in aqueous solution containing oxalic acid corresponds to the decomposition of organic compounds to CO 2 and H2O. © 2014 Copyright Taylor & Francis Group, LLC.


Kadirova Z.,Tashkent Chemical Technological Institute | Tolipov S.,Institute of Bioorganic Chemistry | Fedorovskiy O.,RAS Nesmeyanov Institute of Organoelement Compounds | Bakhtiyar I.,Institute of Bioorganic Chemistry | Parpiev N.,National University of Uzbekistan
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title compound, C 14H 14F 3NO 4, the 3,3,3-trifluoro-pyruvate fragment has a syn configuration and is noncoplanar with the indole plane [dihedral angle = 84.87 (5)°]. In the crystal, mol-ecules form inversion-related dimers via pairs of inter-molecular O - H⋯O hydrogen bonds. These dimers are connected by inter-molecular N - H⋯O=C(CF3) hydrogen bonds to form a two-dimensional network structure. © Kadirova et al. 2011.


Azizov O.,Institute of General and Inorganic Chemistry | Kadirov Z.,Tashkent Chemical Technological Institute | Azizov T.,Institute of General and Inorganic Chemistry | Tolipov S.,Institute of Biorganic Chemistry | Ibragimov B.,Institute of Biorganic Chemistry
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In title compound, [Ca(C7H5O2) 2(C7H6O2)(H2O)] n, the eight-fold-coordinated CaII ion is bonded to four carboxylate O atoms from two benzoate ions, an O atom from benzoic acid and a water O atom. One of the carboxylate groups bridges adjacent Ca2+ ions, forming a polymeric ribbon structure parallel to [010]. In the crystal, the benzoate anions and water molecule interact by way of inter- and intramolecular O-H⋯O hydrogen bonds.


Jin J.,Jiangnan University | Sheraliev G.,Jiangnan University | Sheraliev G.,Tashkent Chemical Technological Institute | Xie D.,Jiangnan University | And 3 more authors.
JAOCS, Journal of the American Oil Chemists' Society | Year: 2016

The current concern for health has raised the importance of natural micronutrients in edible oils and fats. Different from common micronutrients, e.g., tocopherols, tocotrienols, stigmasterol and sitosterol, new and emerging specialty micronutrients, such as plastochromanol-8, resveratrol, phenylpropanoid amides of 5-hydroxytryptamine, lanosterol, ergosterol and cyclolinopeptides, are becoming increasingly popular among health-conscious people. The first three are phenolic compounds, the forth and fifth sterols, and sixth a peptide. These micronutrients are usually present in certain oils or oilseed-related byproducts, including rapeseed, peanut, flaxseed, tea seed, and camellia oils, and safflower seed cakes, all of which are the highly valuable products of the lipid industry in China nowadays. The first object of this review is to discuss the characteristics of the micronutrients, mainly including their varieties, structures, and sources. Second, the antioxidant activities and indicative functions for oil quality were also analyzed in detail. Third, refining techniques, breeding programs and extraction methods are suggested. Suitable modification treatments of certain micronutrients are also advocated to make them easy to incorporate in other foods. © 2015 AOCS.


Fiocco L.,University of Padua | Babakhanova Z.,Tashkent Chemical Technological Institute | Bernardo E.,University of Padua
Ceramics International | Year: 2016

Rare-earth (RE) doped glass-ceramics represent very interesting luminescent materials. The thermal annealing of the glass precursor causes the controlled precipitation of several crystalline phases, in which RE may be variously distributed, also with different oxidation states, e.g. Eu2+ and Eu3+. The present investigation demonstrates the feasibility of preparation of RE-doped alumino-boro-silicate glass-ceramics by direct firing in air (at 1000-1200 °C) of a preceramic polymer, filled with nano- and micro-sized particles, as an alternative to glass melting and annealing. In particular BaCO3 or SrCO3 micro-particles, mixed with nano-sized γ-Al2O3, were found to react with amorphous silica, available from the oxidative decomposition of a commercial silicone, yielding a strontium or a barium alumino-silicate phase. Boric acid micro-particles contributed both to the development of a liquid phase upon firing (promoting ionic interdiffusion) and to the formation of a La-borate phase, by interaction with La2O3 micro-particles. The blue and red luminescence of the obtained glass-ceramics is attributed to the incorporation of Eu2+ and Eu3+ ions, from nano-sized Eu2O3 filler, in alumino-silicate and borate phases, respectively. © 2016 Elsevier Ltd and Techna Group S.r.l.


Babakhanova Z.,Tashkent Chemical Technological Institute | Aripova M.,Tashkent Chemical Technological Institute | Bernardo E.,University of Milan
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2016

Luminescent materials, activated by europium ions, with the composition SrAl2Si2O8/LaBO3 were synthesized using organosilicon compounds (methyl polysiloxane MK). The luminescence properties in red and blue LED range are characteristic of materials synthesized at 1100°C. In addition, strong luminescence is characteristic of trivalent europium ions (peaks at 591, 616, and 655 nm) in the red region of the spectrum and weak luminescence in the blue region of bivalent europium ions (peak at 405 nm). The possibility of incorporating two types of europium cations (Eu2+ and Eu3+) into the structure of synthesized polycrystalline materials makes it possible to regulate their spectral properties as a function of the conditions of synthesis. © 2016 Springer Science+Business Media New York


Kadirova Z.C.,Tashkent Chemical Technological Institute | Chepulsky S.A.,National University of Uzbekistan | Parpiev N.A.,National University of Uzbekistan | Talipov S.A.,Institute of Biorganic Chemistry | Sharipov K.T.,Tashkent Chemical Technological Institute
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

In the title compound, (C13H15N2O) 2[ZnCl4], also known as di(harmalinium) tetra-chloridozincate, the ZnII atom is in a distorted tetrahedral coordination of the chlorido ligands. In the cation, the meth-oxy and methyl groups are both coplanar with with rings to which they are attached [maximum deviations of 0.232 (4) and 0.259 (4) Å, respectively]. In the crystal, the alkaloid cations and metal complex anions inter-act by way of N - H⋯Cl hydrogen bonds involving each Cl atom, resulting in a network structure.


Adinaev K.A.,Tashkent Chemical Technological Institute | Ismatov A.A.,Tashkent Chemical Technological Institute
Russian Journal of Applied Chemistry | Year: 2010

The information on obtaining colored transparent glasses of lead silicate composition is given in the article. Cr2O3, Mn 2O3, Fe2O3, Ni2O 3, Y2O3, Ce2O3, Nd 2O3, and Er2O3 are used as colorants. Structural features of obtained glasses are investigated by methods of infrared spectroscopy and electron microscopy. © 2010 Pleiades Publishing, Ltd.


Juraev A.B.,Tashkent Chemical technological Institute | Adilov R.I.,Tashkent Chemical technological Institute | Nizamov T.A.,Tashkent Chemical technological Institute | Alimukhamedov M.G.,Tashkent Chemical technological Institute | And 2 more authors.
KGK Kautschuk Gummi Kunststoffe | Year: 2014

This article is dealing with synthesis of unsaturated polyethers on the basis of alcoholysis products from polyethylene terephthalate containing household waste. As monomers active solvents were investigated for their influence on conditions and reaction speed of condensation of unsaturated polyethers. It has been shown, that styrene solutions of unsaturated polyethers are necessary for processing in products at room temperature and acrylonitrile solutions at high temperature.


Alimzhanova Zh.I.,Tashkent Chemical Technological Institute | Kadyrova D.S.,Tashkent Chemical Technological Institute | Yusupova M.N.,Tashkent Chemical Technological Institute
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2014

Green, blue and turquoise ceramic pigments have been obtained by means of heterovalent substitution of atoms based on calcium aluminosilicate (anorthite) with calcium and silicon ions replaced by transition elements and aluminum using quartz sand from the Navoinskoe deposit, Samarkand chalk and alumina-containing wastes from the Shurtanskii Gas-Chemical Complex. The physical-chemical properties of the pigments were studied. The new ceramic pigment compositions were used to produce a commercial test lot of decorative majolica. © 2014 Springer Science+Business Media New York.

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