Advanced Welding and Micro Joining / Packaging for the 21st Century
Vols. 580-582
Vols. 580-582
Advances in Nanostructured Materials Processed by SPD
Vol. 579
Vol. 579
Physical and Numerical Simulation of Materials Processing
Vols. 575-578
Vols. 575-578
Rapid Thermal Processing and beyond: Applications in Semiconductor Processing
Vols. 573-574
Vols. 573-574
Stress Evaluation Using Neutrons and Synchrotron Radiation
Vols. 571-572
Vols. 571-572
Metastable and Nanostructured Materials III
Vol. 570
Vol. 570
Eco-Materials Processing and Design IX
Vol. 569
Vol. 569
Materials Structure & Micromechanics of Fracture V
Vols. 567-568
Vols. 567-568
Explosion, Shock Wave and Hypervelocity Phenomena in Materials II
Vol. 566
Vol. 566
PRICM 6
Vols. 561-565
Vols. 561-565
Advanced Structural Materials III
Vol. 560
Vol. 560
Recrystallization and Grain Growth III
Vols. 558-559
Vols. 558-559
Silicon Carbide and Related Materials 2006
Vols. 556-557
Vols. 556-557
Eco-Materials Processing and Design IX
Volume 569
Paper Title Page
Abstract: Nano-sized nitrogen-doped Ti-W mixed oxides (N-TiO2-x%WO3) were prepared by soft
chemical method, and their intrinsic characteristics were investigated using XRD, TEM, N2
adsorption and desorption isotherms, UV-Vis diffuse reflectance spectra and XPS. Experiments on
photodegradation of Methylene Blue (MB) under visible light irradiation were carried out to
evaluate the photocatalytic abilities of N-TiO2-x%WO3. Chemical Oxygen Demand (COD) analysis
was also performed to evaluate the mineralization abilities of N-TiO2-x%WO3. It is shown that the
N-TiO2-x%WO3 exhibited higher COD removing rates compared with Degussa P25. The color
bleaching rates of N-TiO2-x%WO3 were equal to that of Degussa P25. The enhanced photocatalytic
activities were probably related to the strong absorption abilities of the N-TiO2-x%WO3.
1
Abstract: The objective of this study is to evaluate the performance of photocatalysis/hydrogen
peroxide/metal membrane system. Metal membrane for the separation of TiO2 particles was used in
an experiment and nominal pore size is 0.5 μm. Hydrogen peroxide was tested as oxidants. The
removal efficiency of CODCr and color for initial hydrogen peroxide concentration increases rapidly
with an increase in the hydrogen peroxide concentration up to 50 mg/L. The removal efficiency of
of CODCr and color for 50 mg/L of initial hydrogen peroxide concentration was about 95 % and
98 %, respectively. However, the addition of hydrogen peroxide over 50 mg/L inhibits the system
efficiency. The addition of hydrogen peroxide in UV/TiO2 system enhanced removal efficiency of
CODCr and color compared to no addition of hydrogen peroxide. This may be ascribed to capture
the electrons ejected from TiO2 and to produce OH radicals. The application of metal membrane in
UV/ TiO2/H2O2 system enhanced removal efficiency of CODCr and color due to the adsorption of
metal membrane surface as well as the production of OH radical. In application of metal membrane
with nominal pore size 0.5 μm, TiO2 particles were effectively separated from the treated water by
metal membrane rejection. Photocatalytic metal membrane was much smaller resistance than these
of humic acid, TiO2 and humic acid/ TiO2 due to humic acid degradation of photocatalytic reaction.
5
Abstract: Nanoscale TiO2 is widely used in consumer products like sunscreen and cosmetics. The
establishment of damage evaluation test method was attempted to examine the potential
neurotoxicity of nanoscale TiO2 to human body skin in vitro model. The emergence amounts of
carbon dioxide, which was expected one of the generation products from the skin according to the
titania photocatalyst nanoparticles activity under UV / visible light radiation, were identified and
measured by the gas analyzer. It was found that it could evaluate the degrees of damage to skin with
the photocatalysts activity by using the new evaluation test method considered.
9
Abstract: A novel photoresponsive zirconia (ZrO2) precursor solution was prepared using
zirconium tetra-n-butoxide, 4-(phenylazo)benzoic acid and ethyleneglycol monomethylether. Two
kinds of ZrO2 films were prepared using the photoresponsive ZrO2 precursor solution and by
dip-coating while applying an electric field to the substrates: one was the film prepared with
ultraviolet (UV) irradiation to the solution and as-deposited films; the other was the film prepared
without UV irradiation. It was found that the surface roughness of films was greatly changed by UV
irradiation. Furthermore, the photocatalytic activity of the rough film was greater than that of the
smooth film.
13
Abstract: To obtain porous TiO2 film, the precursor sol was prepared by hydrolysis of Ti
isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by
dip-coating technique on glass substrates using this solution. The TiO2 film was calcined at 500 °C.
The maximum thickness of the film by one–run dip-coating was ca. 740 nm. The film was
composed of nanosized particle and pore. The porosity of the TiO2 film was increased by the
addition of trehalose dihydrate to the sol. The porous TiO2 films were calcined at various
temperatures. The effects of the calcination temperature on the microstructure of the porous TiO2
film were investigated. The porous film prepared from sol containing trehalose still kept the porous
structure for calcination at 950 °C. The phase transition temperature from anatase to rutile of the
film was shifted from 650 to 700 °C by trehalose addition to the sol.
17
Abstract: Due to excellent photocatalytic and optical properties of titanium dioxide (TiO2), it has
been applied in several products such as food packaging plastics, materials for vehicles or for
buildings and sunscreen-protecting cosmetics. In this present work, the synthesized as well as
commercial TiO2 was coated onto a household curtain fabric for anti-microbial and ultraviolet (UV)
shielding functions. The coating was performed by inducing the deposition of TiO2 layer from the
Ti precursor onto the fabric surface pre-treated with silane adhesive agent so as to improve the
adhesion. Ag nanoparticles were also incorporated in some samples to further improve the antibacterial
function. Anti-bacterial activities of the coated fabric were evaluated by standard
qualitative test (the Kirby-Bauer test (AATCC 147)). Efficiency for UV shielding was evaluated by
measuring a UV-Vis reflection of the coated fabrics both before and after subjecting to several
washing cycles. The result showed that the TiO2-coated fabrics developed had potential as antibacterial
and UV shielding for the curtain industry.
21
Abstract: Titanium dioxide nanofibers were fabricated by electrospinning technique. The titania
solutions were obtained from adding various types of Ti precursor (Ti(OBu)4, Ti(OiPr)4, and
Ti(OPr)4) to an ethanol solution containing polyvinyl pyrrolidone (PVP). Acetic acid was used to
stabilize the solution and to control the hydrolysis reaction. The porous and well-defined crystalline
structure was obtained after calcined at 450oC for 1 h. The thermal behavior, phase composition
including crystallite size, as well as the morphology of as-synthesized nanofibers was obtained from
thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM)
and transmission electron microscopy (TEM), respectively. The average diameter of these nanofibers
was in the range from 100 to 400 nm depending on titania precursor. The photocatalytic activity of
TiO2 fibers were evaluated for NOx degradation in a gaseous phase. The results demonstrated that at
the same catalyst loading, the photocatalytic activity of TiO2 nanofiber was higher than the
commercial Degussa P-25.
25
Abstract: This study was conducted to evaluate the effect of a photocatalysis/oxidant system for the
treatment of humic acid and heavy metals in aqueous solutions. Hydrogen peroxide, ozone and
potassium peroxodisulfate were tested as oxidants. The effect of the oxidant concentration was
conducted with a pH of 7, a UV intensity of 64 W and a TiO2 dosage of 0.3 g/L. The addition of
oxidants over the amounts of H2O2 50 mg/L, O3 20 g/m3 and K2S2O8 50 mg/L inhibits the system
efficiency. The negative effect of the high concentration of oxidants likely results from OH radical
quenching caused by the excess oxidant. Therefore, the optimal dosages for the oxidants such as a
hydrogen peroxide, ozone and potassium peroxodisulfate were found to be 50 mg/L, 20 g/m3 and 50
mg/L, respectively. The addition of an oxidant in the UV/TiO2 system enhanced the degradation
efficiency of humic acid and heavy metals compared to no addition of an oxidant. The degradation
efficiency of humic acid and heavy metals was much greater for the UV/TiO2/H2O2 system.
29