scholarly journals Synthesis of vanadium-enriched oxide materials via modified sol-gel route with the use of waste solutions contaminated with vanadium ions

2020 ◽  
pp. 60-75
Author(s):  
Ewelina Weidner ◽  
Adam Piasecki ◽  
Katarzyna Siwińska-Ciesielczyk ◽  
Teofil Jesionowski ◽  
Filip Ciesielczyk
Keyword(s):  
Sol Gel ◽  
Oxide Materials ◽  
Vanadium Ions

Bisphenol A Imprinted SiO2‐ZrO2 Mixed Oxide Materials Prepared by Acetic Anhydride Sol‐Gel Method

2007 ◽  
Vol 37 (10) ◽  
pp. 771-777 ◽  
Author(s):  
Masahiro Fujiwara ◽  
Ikou Yamamura ◽  
Motoyasu Nishiyama ◽  
Kumi Shiokawa ◽  
Souichi Ohtsuki ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Bisphenol A ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Oxide Materials ◽  
Gel Method ◽  
Sol Gel Method

Sol-Gel Polymerization of Tetraalkoxygermanium and Organotrialkoxygermanium Monomers

1996 ◽  
Vol 431 ◽  
Author(s):  
Brigitta M. Baugher ◽  
Douglas A. Loy
Keyword(s):  
Chemical Modification ◽  
Sol Gel ◽  
Silica Gels ◽  
Germanium Oxide ◽  
Oxide Materials ◽  
Siloxane Bond ◽  
Mild Conditions ◽  
Condensation Reactions ◽  
Hydrolysis And Condensation ◽  
Opening Up

AbstractWhile the sol-gel polymerizations of tetraalkoxy- and organotrialkoxysilanes have been extensively studied, there have been few reports of similar investigations with the analogous tetraalkoxygermanium and organotrialkoxygermanium compounds. Germanium alkoxides have received less attention due, in part to their higher cost, but also their greater reactivity towards hydrolysis and condensation reactions. Germanium oxide materials are potentially interesting because the Ge-O-Ge linkage is labile (compared with the siloxane bond in silica gels and polysilsesquioxanes) opening up the possibility of further chemical modification of the polymeric architecture. This may permit hydrolytic reorganization of germanium oxide networks under relatively mild conditions. In this paper, we will present the results of our investigations of the solgel polymerizations of tetraethoxygermanium 1, tetraisopropoxygermanium 2, and methyltriethoxy-germanium 3 to afford network materials as both xerogels and aerogels.

CHEMICAL COMPOSITION STUDY OF VANADIUM PENTOXIDE XEROGELS DOPED BY BOVINE ALBUMIN

2016 ◽  
Vol 23 (06) ◽  
pp. 1650058
Author(s):  
R. SEREIKA ◽  
S. KACIULIS ◽  
A. MEZZI ◽  
M. BRUCALE
Keyword(s):  
Vanadium Pentoxide ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Thin Layers ◽  
Xps Spectra ◽  
Force Microscopy ◽  
Molar Ratios ◽  
Atomic Force ◽  
Protonated Amine ◽  
Vanadium Ions

Metal–bioorganic compounds of vanadium pentoxide and bovine serum albumin (BSA) (Fraction V) were obtained by using sol–gel method. Series of the samples (BSA)xV2O[Formula: see text]H2O, where [Formula: see text], 0.01 and 0.001, were originally produced by the synthesis of vanadium pentoxide xerogels and subsequent blending with water-dissolved BSA in appropriate molar ratios. It was evident that the gelation process does not occur for [Formula: see text]. For the X-ray photoelectron spectroscopy (XPS) studies, the thin layers of these materials were prepared by drying the gel onto the glass and mica substrates. The surface morphology of the samples was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. It follows from the analysis of experimental XPS spectra of (BSA)xV2O[Formula: see text]H2O that the nitrogen ions in pure albumin and in (BSA)[Formula: see text]V2O[Formula: see text]H2O are present in imine, amine and protonated amine groups. The additional protonated amine arises when the concentration of albumin in (BSA)xV2O[Formula: see text]H2O is low ([Formula: see text]). Increasing the amount of albumin results in decrease of the number of oxygen ions bonded to vanadium. At the same time (with increase of albumin), the component of oxygen bounded to carbon and nitrogen is increasing. In the samples with greater amount of albumin, the reduction of vanadium ions occurs. This means that the trivalent and tetravalent vanadium ions are present together with pentavalent ones.

Sol–gel versus sputtering indium tin oxide films as transparent conducting oxide materials

2016 ◽  
Vol 27 (5) ◽  
pp. 4913-4922 ◽  
Author(s):  
M. Duta ◽  
M. Anastasescu ◽  
J. M. Calderon-Moreno ◽  
L. Predoana ◽  
S. Preda ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Transparent Conducting Oxide ◽  
Sol Gel ◽  
Oxide Films ◽  
Oxide Materials ◽  
Transparent Conducting ◽  
Tin Oxide Films

Synthesis of Water-soluble Silicon Oxide Material by Sol-gel Reaction in Tetraalkoxysilane-aminoalkyltrialkoxysilane Binary System

2005 ◽  
Vol 20 (8) ◽  
pp. 2199-2204 ◽  
Author(s):  
Yoshiro Kaneko ◽  
Nobuo Iyi ◽  
Taki Matsumoto ◽  
Hisanao Usami
Keyword(s):  
Silicon Oxide ◽  
Sol Gel ◽  
Water Soluble ◽  
Magic Angle ◽  
Oxide Material ◽  
Oxide Materials ◽  
Ordered Structure ◽  
Stripe Pattern ◽  
Diffraction Profile ◽  
Soluble Silicon

A series of water-soluble silicon oxide materials was synthesized by the sol-gel reaction of tetramethoxysilane (TMOS)/3-aminopropyltrimethoxysilane (APTMOS) mixtures catalyzed by hydrochloric acid with varying TMOS/APTMOS ratios. Increase in TMOS composition made the products less water-soluble, and the richest TMOS composition for the water-soluble silicon oxide materials was found to be TMOS/APTMOS = 7/3 (mol/mol). Ultraviolet-visible spectroscopy of a 10 wt% aqueous solution of the product with TMOS/APTMOS = 7/3 showed a high transmittance in the visible region. Its infrared spectrum showed an absorptionband attributable to the Si–O bond, and the 29Si dipole decoupled/magic angle spinning–nuclear magnetic resonance spectrum exhibited signals in the regions of T3, Q3, and Q4, indicating a dense siloxane network structure. A peak due to an ordered structure with a 1.76 nm periodicity was observed in the x-ray diffraction profile, and a stripe pattern was observed in the transmission electron microscopy image. These results indicate that the rodlike silicon oxide macromolecules with a 1–2-nm diameter stack parallel. Thus a silicon oxide material with nano-ordered structure was successfully formed and such a structure produced the water solubility.

Structural Investigation of Sol-Gel-Derived Hybrid Siloxane-Oxide Materials Using 29Si MAS-NMR Spectroscopy

1992 ◽  
Vol 286 ◽  
Author(s):  
F. Babonneau ◽  
L. Bois ◽  
J. Livage ◽  
S. Dire
Keyword(s):  
Single Phase ◽  
Structural Investigation ◽  
Sol Gel ◽  
Structural Models ◽  
Mas Nmr ◽  
Oxide Materials ◽  
29Si Mas Nmr ◽  
Oxide Systems ◽  
Oxide Component ◽  
Phase Systems

ABSTRACTHybrid siloxane-oxide systems were prepared by sol-gel techniques. Siloxane precursors are either monomeric species, dimethyldiethoxysilane, or OH-terminated polydimethylsiloxanes. The oxide component is introduced via metallic alkoxides, M(OR)n (M=Si, Ti, Zr). Transparent materials from flexible to brittle gels, can be obtained over a large M/siloxane range. The structure of the various systems was investigated by 29Si MAS-NMR. The signals due to the difunctional Si units, (CH3)2SiO, depend strongly on the nature of M and on the M/siloxane ratio. Structural models are proposed, ranging from single phase systems with highly interconnected siloxane and oxide units, to nanocomposites made of polysiloxane chains crosslinked with oxide-based particles.

scholarly journals XPS Study of Sol-Gel Synthesized Vanadium-Titanium-Hydroquinone Oxide Bronze Films

2015 ◽  
Vol 54 ◽  
pp. 201-207
Author(s):  
Vladimiras Bondarenka ◽  
R. Sereika
Keyword(s):  
Sol Gel ◽  
Hydroxyl Groups ◽  
Xps Spectra ◽  
Water Oxygen ◽  
Oxide Bronze ◽  
Vanadium Titanium ◽  
Xps Study ◽  
Method Analysis ◽  
Powder Titanium ◽  
Vanadium Ions

Vanadium-titanium-hydroquinone oxide bronze, V1.67Ti0.33O5±δ /HQ (HQ-hydroquinone), was synthesized by using the sol–gel method. Vanadium pentoxide powder, titanium dihydride, hydrogen peroxide and hydroquinone were used as the starting materials to produce bronze. The composition of the synthesized compound was compared with V1.67Ti0.33O5±δ∙nH2O/HQ xerogel data. The xerogel and bronze were investigated by means of the XPS method. Analysis of the V–O region of XPS spectra showed that vanadium ions in xerogel ocurr in V5+ and V4+ states. In bronze, these ions are in a stable V5+ state. The oxygen in xerogel can be associated with O2- ions, hydroxide grouping and water. Oxygen only exists in bronze in the form of O2- ions and hydroxyl groups. Titanium ions in both cases are in a stable Ti4+ state.

scholarly journals Synthesis of Selected Mixed Oxide Materials with Tailored Photocatalytic Activity in the Degradation of Tetracycline

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5361
Author(s):  
Katarzyna Siwińska-Ciesielczyk ◽  
Angelika Andrzejczak ◽  
Dominik Paukszta ◽  
Adam Piasecki ◽  
Dariusz Moszyński ◽  
...  
Keyword(s):  
Mixed Oxide ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Degradation Products ◽  
Sol Gel ◽  
Reaction System ◽  
Physicochemical Analysis ◽  
Oxide Materials ◽  
Oxidation Activity ◽  
X Ray

The elimination of antibiotics occurring in the natural environment has become a great challenge in recent years. Among other techniques, the photocatalytic degradation of this type of pollutant seems to be a promising approach. Thus, the search for new photoactive materials is currently of great importance. The present study concerns the sol–gel synthesis of mono, binary and ternary TiO2-based materials, which are used as active photocatalysts. The main goal was to evaluate how the addition of selected components—zirconium dioxide (ZrO2) and/or zinc oxide (ZnO)—during the synthesis of TiO2-based materials and the temperature of thermal treatment affect the materials’ physicochemical and photocatalytic properties. The fabricated mixed oxide materials underwent detailed physicochemical analysis, utilizing scanning-electron microscopy (SEM), X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), energy-dispersive X-ray spectroscopy (EDS), low-temperature N2 sorption (BET model), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The synthesized mixed oxide materials were used as photocatalysts in the heterogeneous photodegradation of tetracycline (TC). The physicochemical properties of the fabricated photocatalysts, including morphology, crystalline and textural structure, as well as the pH of the reaction system in the photocatalytic tests, were taken into account in determining their photo-oxidation activity. LC–MS/MS analysis was used to identify the possible degradation products of the selected antibiotic.

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