The photocatalytic decomposition efficiency of gaseous 2-propanol was studied using a titanium dioxide thin film under very weak UV light; the incident light intensity 36 nW−45 μW·cm-2. Under such low-intensity illumination, value quantum yield (QY) increased gradually with decreasing number absorbed photons and finally saturated (28%) for less than 4 × 1011 quanta·cm-2·s-1 an initial concentration 1000 ppmv. Thus, purely light-limited conditions were reached. For lower concentrations, QY...

The photocatalytic degradation of bisphenol A (BPA), a representative endocrine disruptor, was carried out in TiO2 aqueous suspension. main purposes were to confirm the total mineralization BPA and evaluate estrogenic activity treated water during reaction. An initial concentration 175 μM totally degraded carbon dioxide by TiO2-photocatalyzed reactions under UV irradiation 10 mW cm-2 for 20 h. Four HPLC peaks indicating intermediate products appeared chromatograms monitored at 275 nm, but...

TiO2 coatings are known to protect some metals, including type 304 stainless steel, from corrosion on the basis of its reductive energy generated under UV irradiation. A coating is coupled with a WO3 as an electron pool, in which can be stored. film steel plate charged by UV-irradiated same plate, 3 wt % NaCl aqueous solution, pH 5. The for while even after light turned off. Thus, protects and charges during day, night. charge−discharge cycles repeatable. TiO2−WO3 composite also has effects.

Ag-TiO(2) films exhibiting multicolor photochromism were prepared by photoelectrochemical reduction of Ag(+) to Ag nanoparticles in nanoporous TiO(2) under UV light. Color the film, initially brownish-gray, changes a colored visible light color and reverts brownish-gray Their chromogenic properties improved simultaneous irradiation for deposition with blue lights suppress formation anisotropic particles. Nonvolatilization image was also achieved removing that generated during Once...

The degradation of 17β-estradiol (E2) in water by TiO2 photocatalysis was investigated; concurrently the estrogenic activity treated evaluated during photocatalytic reactions an estrogen screening assay. As a result, 10-6 M E2 totally mineralized to CO2 1.0 g L-1 suspension under UV irradiation for 3 h. 10ε-17β-Dihydroxy-1,4-estradien-3-one and testosterone-like species were elucidated as intermediate products GC/MS analysis. mechanisms discussed not only experimentally but also...

We investigated the photoelectrochemical behavior of type 304 stainless steel (SUS 304) with thin film coatings, applied by a spray pyrolysis technique, for purpose cathodic photoprotection from corrosion. The photopotential -coated SUS was −350 mV vs. Ag/AgCl in an aerated aqueous solution containing 3 wt % NaCl (pH 7) under illumination 10 mW cm−2 ultraviolet (UV) light, which more negative than corrosion potential bare (−100 mV). did not change solutions 0.01 to 5 NaCl. No observed at pH...

Reductive energy generated at a TiO2 photocatalyst under UV light can be stored in WO3 by coupling them together, and the used after dark. However, reduction of requires cation intercalation for charge neutralization. Thus, behavior TiO2−WO3 composite on an ITO electrode was examined nonelectrolytic media. When were close to each other (less than 1 mm), could reduced even pure water or humid air (relative humidity ≥25%), irradiating with light. In dry air, not efficiently, if nanoparticles...

The photocatalytic decomposition efficiency of gas-phase acetaldehyde was studied using a titanium dioxide thin film under weak UV illumination. Acetic acid and carbon were detected as the main reaction products. It found that apparent quantum yields (QY) for degradation are determined by normalized absorbed photon number (Inorm /s-1), parameter is defined ratio photons to adsorbed molecules. This result similar 2-propanol reported previously (Ohko, Y.; Hashimoto, K.; Fujishima, A. J. Phys....

In the multicolor photochromism of TiO2 nanoporous films loaded with photocatalytically deposited Ag nanoparticles, visible light-induced electron transfer from to oxygen molecules plays an essential role. Here we examined effect on transfer. We found that not only Ag, but also electrodeposited and commercially available nanoparticles in a film exhibit photochromism. The exhibits ZnO film, nanoporouns indium–tin oxide (ITO) SiO2 matrices. Photoelectrochemical measurements for Ag-TiO2...

A kinetic study of the degradation gas-phase 2-propanol was carried out using a TiO2 film photocatalyst in batch-type reactor under relatively high-intensity UV light illumination; incident intensity varied from 35 μW cm-2 to 60 mW cm-2, and initial concentration 0.1 ppmv 100 ppmv. Although rate increased with increasing numbers absorbed photons at lower intensities, it gradually saturated finally reached completely mass transport-limited conditions. We simulated decrease as function time...

TiO(2) photocatalysts were successfully coated on silicone catheters or medical tubes by pretreatment of the surface with a sulfuric acid solution (5 M) for 3 h. The film adhered to substrate strongly against tensile and bending stresses. On TiO(2)-coated silicone-catheters under UV illumination, both bleaching methylene blue dye photocatalytic bactericidal effect Escherichia coli (E. coli) cells confirmed. Thus, this type catheter can be sterilized cleaned simply irradiation low-intensity...

Abstract Ag/titanium dioxide (TiO 2 )‐coated silicon catheters were easily fabricated with Ag nanoparticles deposition on both the inside wall and outside of TiO ‐coated by photocatalysis. This is an application coated , which possess a self‐sterilizing self‐cleaning property combining UV light illumination (Ohko et al., J Biomed Mater Res: Appl Biomater 2001;58:97). Ag/TiO exhibited strong bactericidal effect even in dark. When 2–5 × 10 5 colony‐forming units Escherichia coli Pseudomonas...

A deactivating behavior of TiO2 photocatalysts in NO2 oxidation to HNO3 was studied with use nanoparticulate thin films (0.5−1.5 μm thick) under UV light illumination over 10 h. The photocatalytic activity decreased accumulation on the surface. For thicker films, deactivation rate found be slower. amount trapped surface increased and finally saturated, at which largest proportional thickness film. On basis results, we concluded that produced HNO3, inhibiting reaction as a physical barrier,...

Recently, photonic band gap (PBG) crystals with lattice parameters comparable to the wavelength of light have attracted much attention, because they offer unique ways in which control propagation light. PBG applications laser, quantum optical devices, and so on. For many these applications, it is important capability tuning structures. The fabrication such tunable still a challenge. In this paper, we proposed that switchable could be realized by taking advantage phase transition liquid...

TiO2 coupled with WO3 has been reported as an energy storage photocatalyst, which functions partially even in the dark. The can be charged reductive generated at under UV light illumination. In this work, charge–discharge behavior of TiO2–WO3 films air was studied and compared that liquids (0.1 M NaCl water). Charging rate, discharge capacity, apparent quantum yield self-discharging rate for electron were evaluated. charging film air, humidity controls those factors when intensity 10 mW...

The photochromism and rewritability of Ag-TiO2 films were deactivated by modification with thiols to make it possible retain color images displayed on the (for more than 3 days under white fluorescent lamps), while properties fully reactivated UV-irradiation.

Objective: Clean intermittent catheterization (CIC) requires a large number of disposable catheters or amount water and disinfectant. We made titanium dioxide (TiO 2 )‐coated for CIC using technology we have developed previously, examined the photocatalytic antibacterial effect this catheter only light energy safety type practical clinical use. Methods: TiO ‐coated were filled with bacterial cell suspensions illuminated 15‐W black‐light lamp testing potency. Next, soaked control toxic...

A cathode-separated photocatalyst was prepared by coating one side of a porous conductive pellet with TiO2, and impregnating the an electrolyte. cathodic reaction (e. g., reductive coloring tetrazolium blue) proceeded at while TiO2 irradiated UV light.