A new epoxide-mediated route for binary Al2O3-TiO2 aerogels

A new method for the synthesis of binary aerogels Al2O3-TiO2 by epoxide-mediated route was proposed. The synthesis is conducted in DMF solution, the starting materials for the synthesis are aluminium nitrate and titanium chloride. The obtained homogeneous amorphous aerogels possess high surface (250–750 m2/g) and porosity (86–95 %).

High Flame Retardant Performance of SiO2-TiO2 Sol Coated on Polyester/Cotton Fabrics

SiO2 and TiO2 sols were successfully synthesized by using sodium silicate and titanium chloride as Si and Ti sources. SiO2-TiO2 sol coated polyester/cotton fabric was fabricated by deep-coating method and using SiO2, TiO2 sols as coating materials. SiO2-TiO2 coated fabric were characterized by XRD, FTIR, TGA, SEM and EDX. From SEM image, it showed the SiO2, TiO2 particles of 20-30 nm which well deposited on fabric surface. TGA result revealed the significant improvement of thermal resistance and stability of SiO2-TiO2 coated fabric as compared to those of uncoated fabric. Flame retardant performance of SiO2-TiO2 coated fabrics was much better than that of uncoated fabric. Thus, SiO2-TiO2 coated fabric SiO2-TiO2 content of 26wt% showed the UL-94 classification of V-0 and LOI value of 30.3 were obtained. Moreover, mechanical property (tear strength) of SiO2-TiO2 coated fabrics were also improved.

EVALUATION THE EFFECT OF GREEN SYNTHESIS TITANIUM DIOXIDE NANOPARTICLES ON ACINETOBACTER BAUMANNII ISOLATES

Acinetobacter baumannii is gram negative opportunistic coccobacilli,the most important agent in nosocomial infections with high mortality rate. This bacteria is characterized by (biochemical tests, polymerase chain reaction (PCR) and vitek-2 system). The antibiotic susceptibility result of A. baumannii isolates were shown resistant to (Methicillin, Nitrofurantion), while sensitive to (colistin, Ciprofloxacin).This study was aimed to biosynthesis of titanium dioxide nanoparticles by using prodigiosin pigment produced from clinical isolate Serratia marcescens as reducing and stabilizing agent for Titanium dioxide nanoparticles (TiO2 NPs) and used as antibacterial agent for Acinetobacter baumannii isolated from different clinical sources. TiO2 NPs synthesized by using titanium chloride TiCl4 (5 ml/50 ml) in deionized water with concentration of prodigiosin (10 mg/ml)and adjusted pH at 7 and the temperature at 50 ˚C. TiO2NPs synthesized was Characterized by various technique, such as (AFM , UV-VIS, FTIR , XRD and FE-SEM ). The result showed that wavelength(366)nm was optimum for TiO2NPs that have crystalline shape at average volume (47.52 nm). Green synthesized TiO2 NPs have shown several applications such as biomedical, anticancer, bio sensing, catalysis etc.

Fast Microwave Synthesis of Gold-Doped TiO2 Assisted by Modified Cyclodextrins for Photocatalytic Degradation of Dye and Hydrogen Production

A convenient and fast microwave synthesis of gold-doped titanium dioxide materials was developed with the aid of commercially available and common cyclodextrin derivatives, acting both as reducing and stabilizing agents. Anatase titanium oxide was synthesized from titanium chloride by microwave heating without calcination. Then, the resulting titanium oxide was decorated by gold nanoparticles thanks to a microwave-assisted reduction of HAuCl4 by cyclodextrin in alkaline conditions. The materials were fully characterized by UV-Vis spectroscopy, X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and N2 adsorption-desorption measurements, while the metal content was determined by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The efficiency of the TiO2@Au materials was evaluated with respect to two different photocatalytic reactions, such as dye degradation and hydrogen evolution from water.

TiO2/ZnO PHOTONIC CRYSTAL PREPARED BY SPRAY PYROLYSIS METHOD: APPLICATION TO MULTICHANNEL FILTER

Single-layer titanium dioxide (TiO2, ZnO, double-layer TiO2/ZnO and multilayer TiO2/ZnO/TiO2/ZnO were grown on ordinary glass substrate by ultrasonic spray deposition at 300∘C. Titanium chloride, zinc acetate and deionized water were employed as precursors. The ultraviolet–visible spectrometer spectra show that the quality of optical transmittance in visible wavelength range decreases as the number of bilayers increases. The crystalline phase of the thin films was identified through X-ray diffraction method with diffraction patterns scan used at 2[Formula: see text] from 10∘ to 90∘. From the DRX results, it is found that the crystallinity is enhanced when the number of TiO2/ZnO layers increased. From the 2D/3D atomic force microscopy (AFM) analysis, it is found that the surface of the films was covered by triangle-like particles. However, bilayer and multilayer TiO2/ZnO thin films show smooth and compacted surface roughnesses compared to single-layer TiO2 and ZnO, respectively. In addition to this experimental work, a multichannel filter based on TiO2/ZnO subphotonic crystals is suggested. The transmission properties of this filter have been investigated by means of the transfer-matrix method (TMM). The idea is to import a wedge of air with an apex angle as the defect layer to disturb the original periodicity of the oxide photonic crystal and generate some new kind of multichannel filtering properties.

Synthesis and photocatalytic activities of a CuO/TiO2 composite catalyst using aquatic plants with accumulated copper as a template

A CuO/TiO2 photocatalyst was synthesized by using a hydrolysis method. In the synthesis, the Eichhornia crassipes accumulated with copper was used and combined with titanium chloride precursor.

Development of Sulfur and Silicon Dioxide Activation Method in the Sulfur Concrete Technology

The paper investigates the recovery problem of waste sulfur from metallurgical, oil and gas plants. The method was developed to synthesize inorganic sulfides and sulfur concretes from them using the activating agent – titanium chloride and different silica-containing raw materials. The chemical interaction between sulfur, titanium tetrachloride and silicon dioxide encourages the formation of a strong and compact structure in the material. The physical chemical and quantum chemical calculations confirmed the formation of titanium silicate sulfide and made it possible to suggest the concept of sulfur concrete synthesis. It was found how the amorphous component in the filler influenced the properties of sulfur concrete. The physical mechanical tests were performed on the specimens of sulfur concrete, based on opal crystobalite rock from the different fields. The optimum sulfur concrete formulation was determined. The specimens with the optimum composition have high coefficient of resistance to HCl, H2SO4, CaCl2, NaCl, MgSO4 solutions, high impact resistance, freeze resistance and density to meet GOST concrete standard. The resulting materials can be used for production of some construction materials: paving slabs and blocks, road building materials.

The Influence of the Precursor Type and of the Substrate on the SPD Deposited TiO2 Photocatalytic Thin Films

Photocatalytic degradation of organic pollutants from wastewater using titanium dioxide is recognized as an efficient process. To be feasible, this process needs to be solar- or visible light -activated, but, due to its wide band gap energy, titanium dioxide can only be activated by ultraviolet radiation. In this paper, thin films of titanium dioxide were deposited by Spray Pyrolysis Deposition using organo-metallic (titanium-iso-propoxide) and inorganic (titanium chloride) precursors, as a first step in optimizing the deposition process of titanium dioxide - carbon composite thin films, active in the visible spectral range. The thin films were characterized to outline the differences when using these two precursor solutions, when deposited on Fluorine doped Tin Oxide-glass, regular glass and microscopic glass, in terms of crystallinity (by using X-ray diffraction), elemental composition (using Energy Dispersive X-ray spectrometry), surface morphology (Scanning Electronic Microscopy and Atomic Force Microscopy). The photocatalytic activity of the titanium dioxide thin films was investigated based on the removal efficiencies of methylene blue from a synthetically prepared wastewater. The samples deposited using the inorganic precursor show higher roughness, and this proves to be the most important factor that influences the phocatalytic processes. After 8 hours of ultraviolet irradiation, methylene blue removal efficiencies up to 36% were observed; the highest removal efficiency was registered using the thin titanium dioxide film obtained using the titanium chloride precursor, deposited on fluorine doped tin oxide glass substrate, due to the titanium dioxide-tin dioxide semiconductor tandem formed at the interface, that limits the electron-hole recombination, thus increasing the photoctalytic performance of the substrate.