Titanium oxide Research Papers - Academia.edu (original) (raw)

Top Papers
Most Cited Papers
Most Downloaded Papers
Newest Papers
People
- by
- •
- Water, Water Purification, Multidisciplinary, Titanium dioxide
- by Zdenek Dohnálek
- •
- Chemical Engineering, Heterogeneous Catalysis, Alcohol, Activation Energy
- by ANIL KUMAR H V
- •
- Chemical Engineering, Heterogeneous Catalysis, Photocatalysis, Photocatalytic
- by Håkan Engqvist
- •
- Transmission Electron Microscopy, Multidisciplinary, Adhesion, TEM

Metal dispersion and support effects on Fischer-Tropsch synthesis rate and selectivity were studied at conditions that favor the information of C 5 + hydrocarbons (> 80% selectivity). On Ru, these effects are minor for the supports... more

- by Rocco Fiato
- •
- Chemical Engineering, Chemistry, Analytical Chemistry, Catalysis
- by B. Marsen
- •
- Engineering, Solar Cell, Titanium, Crystal structure
- by Odd-Arne Lorentsen
- •
- Chemical Engineering, NIO, Solubility, Titanium oxide
- by Fabien Pottier
- •
- Engineering, Mass Spectrometry, Hydrogen Energy, Specific surface area
- by Laanab Larbi
- •
- Engineering, Renewable Energy, Scanning Electron Microscopy, Atomic Force Microscopy
- by Pravin Shinde
- •
- Engineering, Performance, Morphology, FTO - Fluorine-doped tin oxide
- by Julio Fraile
- •
- Engineering, Microstructure, Structure, Carbon

... studies [14 and 17] have shown that water dissociatively adsorbed on TiO 2 (100) 1×1 surfaces at 300 K. Based on their results, for the defect-free surface, the O 1s peak broadening after water exposure is assumed to be solely due to... more

- by Li-qiong Wang and +1
- •
- Condensed Matter Physics, Quantum Physics, Surface Science, Ultraviolet

In this work, TiO2 photocatalysts were synthesized using a conventional
sol-gel and hydrothermal synthesis methods with steam pressure treatment.
Photocatalysts were characterized by X-ray diffraction (XRD), diffuse
reflectance spectra (DRS) and N2 adsorption-desorption. The photoactivity of
the samples was analyzed towards the photooxidation of the azo dye Orange
II (Or-II) and phenol using different illumination set-ups to compare the
activity features of photocatalysts. The effect of the synthesis variables such
as the synthesis route, water/alcoxide and alcohol/alcoxide ratios, as well as
the alcohol type was analyzed. TiO2 photocatalysts obtained by hydrothermal
synthesis have a better photoactivity than the particles synthesized by the
chosen sol-gel route, reaching the Or-II degradation photoactivity of the
commercial TiO2 P25. On the other hand, the water/alcoxide ratio and
alcohol type have a marked effect on the photoactivity of the hydrothermal
synthesized TiO2, whereas the alcohol/alcoxide ratio does not have a relevant
effect on the Or-II degradation photoactivity.

- by Sonia Esperanza Reyes Gómez and +1
- •
- Engineering, Chemistry, Water, Water Treatment
- by Claudio Minero
- •
- Chemical Engineering, Analytical Chemistry, Carbon Dioxide, Catalysis
- by Grzegorz D Sulka
- •
- Engineering, Physical sciences, CHEMICAL SCIENCES, Self Organization
- by Odd-Arne Lorentsen
- •
- Chemical Engineering, NIO, Solubility, Titanium oxide

The potential eco-toxicity of nanosized titanium dioxide (TiO2), silicon dioxide (SiO2), and zinc oxide (ZnO) water suspensions was investigated using Gram-positive Bacillus subtilis and Gram-negative Escherichia coli as test organisms. These three photosensitive nanomaterials were harmful to varying degrees, with antibacterial activity increasing with particle concentration. Antibacterial activity generally increased from SiO2 to TiO2 to ZnO, and B. subtilis was most susceptible to their effects. Advertised nanoparticle size did not correspond to true particle size. Apparently, aggregation produced similarly sized particles that had similar antibacterial activity at a given concentration. The presence of light was a significant factor under most conditions tested, presumably due to its role in promoting generation of reactive oxygen species (ROS). However, bacterial growth inhibition was also observed under dark conditions, indicating that undetermined mechanisms additional to photocatalytic ROS production were responsible for toxicity. These results highlight the need for caution during the use and disposal of such manufactured nanomaterials to prevent unintended environmental impacts, as well as the importance of further research on the mechanisms and factors that increase toxicity to enhance risk management.

- by Pedro Alvarez
- •
- Water, Nanoparticle, Titanium, Nanomaterials
- by John Gamble
- •
- Geology, Geochemistry, New South Wales, Spectrum
- by Patrik Schmuki
- •
- Engineering, CHEMICAL SCIENCES, Self Organization, Titanium oxide
- by Eva Chinarro
- •
- Materials Engineering, Condensed Matter Physics, Performance, Pore Size
- by Yusuf Atalay
- •
- Physics, Materials Science, Optics, Solid State Physics
- by Sanjay Kamble
- •
- Chemical Engineering, Modeling, Photocatalysis, Catalyst
- by Laurent Dreesen and +1
- •
- Magnetron Sputtering, Surface Properties, Titanium oxide

A green method has been reported for the synthesis of some dicoumarol derivatives from the reaction of 4- hydroxycoumarin with arylglyoxals. The reactions were efficiently catalyzed by titanium (IV) oxide nanoparticles via an on water... more

A green method has been reported for the synthesis of some dicoumarol derivatives from the reaction of 4-
hydroxycoumarin with arylglyoxals. The reactions were efficiently catalyzed by titanium (IV) oxide nanoparticles via
an on water process. Catalyst also showed good recyclability.

- by Masoud Khaleghiabbasabadi
- •
- Green Chemistry, Titanium oxide
- by Chantal Guillard
- •
- Chemical Engineering, Catalysis, Water Purification, Water Treatment
- by Dana Hankey
- •
- Materials Engineering, Mechanical Engineering, Titanium, X ray diffraction
- by George Demopoulos and +2
- •
- Imaging, Vibrational Spectroscopy, Multidisciplinary, Film
- by Jelena Radjenovic
- •
- Environmental Engineering, Chemical Engineering, Water, Kinetics

Two Kraft-pulp bleaching effluents from a sequence of treatments which include chlorine dioxide and caustic soda were treated by catalytic wet-air oxidation (CWAO) at T=463 K in trickle-bed and batch-recycle reactors packed with either TiO2 extrudates or Ru(3 wt%)/TiO2 catalyst. Chemical analyses (TOC removal, color, HPLC) and bioassays (48-h and 30-min acute toxicity tests using Daphnia magna and Vibrio fischeri, respectively) were used to get information about the toxicity impact of the starting effluents and of the treated solutions. Under the operating conditions, complex organic compounds are mostly oxidized into carbon dioxide and water, along with short-chain carboxylic acids. Bioassays were found as a complement to chemical analyses for ensuring the toxicological impact on the ecosystem. In spite of a large decrease of TOC, the solutions of end products were all more toxic to Daphnia magna than the starting effluents by factors ranging from 2 to 33. This observation is attri...

- by Michèle Besson and +1
- •
- Water, Ecotoxicology, Carbon Dioxide, Catalysis
- by Joe Crayston
- •
- Materials Engineering, Titanium, Sol Gel Process, Titanium oxide
- by Philippe Marcus and +1
- •
- Materials Engineering, Mechanical Engineering, Growth Kinetics, Nucleation and Growth

Photooxidation of triethylamine (TEA) in the presence of O2, N2, and H2O over titanium oxide (TiO2) was investigated using a flat plate reactor. TEA was photocatalytically oxidized to CO2 and some by-products on TiO2 thin film catalysts. The intrinsic oxidation rate of the reaction was determined and was dependent on TEA concentration, humidity level, and light intensity. Photocatalytic deactivation was observed in these reactions. Fourier transform infrared (FTIR) and temperature-programmed desorption with a mass spectrometer as a detector (TPD-MS) were used to characterize the surface of the catalyst and study the deactivation mechanism. FTIR and TPD-MS results suggest that accumulation of carboxylic acid species, –N–N=O, and some other carbonaceous species occurred during the reaction. These by-product species or intermediates were chemisorbed on the catalyst surface. They were stable under reaction conditions and might be responsible for deactivation of TiO2 by either poisoning the active sites directly or blocking the adsorption of TEA on the catalyst surface.

- by James D Freihaut
- •
- Chemical Engineering, Catalysis, Thin Film, Indoor air pollution
- by Guido Busca
- •
- Environmental Engineering, Chemical Engineering, Kinetics, Adsorption
- by Adriana Zaleska
- •
- Doping, Photocatalysis, Band Structure, Titanium dioxide
- by Julie Cairney and +1
- •
- Materials Engineering, Chemical Engineering, Cultural Studies, Raman Spectroscopy
- by Jacob Jonsson
- •
- Engineering, Light Scattering, Solar Energy Materials, Physical sciences
- by Bowen Liu
- •
- Engineering, Scanning Electron Microscopy, Stability, Casting
- by Arlee Smith
- •
- Applied Mathematics, Materials Science, Arsenic, Quantum Mechanics
- by Marta I Litter and +2
- •
- Environmental Engineering, Chemical Engineering, Kinetics, Heterogeneous Catalysis
- by Bekir Karasu and +1
- •
- Materials Engineering, Microstructure, Scanning Electron Microscopy, Additives
- by Tai Nguyen
- •
- Inorganic Chemistry, Titanium, Transition-Metal Oxides, Silica
- by Erik Dahlquist
- •
- Environmental Engineering, Chemical Engineering, Water, Catalysis
- by Jovice Ng
- •
- Biomaterials, Hydroxyapatite, Scanning Electron Microscopy, Titanium
- by Mika Sillanpää
- •
- Water quality, Catalysis, Water Purification, Water Treatment
- by Petrus Pistorius
- •
- Materials Engineering, Heat Transfer, Ironmaking and Steelmaking, Titanium oxide