Papers by Keyword: TiO2

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Authors: Sheng Xi Liao, Peng Zhang, Kun Li, Qing Feng Sun
Abstract: This paper examined the in situ growth of hydrophobic anatase TiO2 coating on wood surface using a cosolvent-controlled hydrothermal method. EDXA, FTIR and XRD analysis confirmed that the growth of TiO2 coating on wood surface was bonded to hydrocarbon chains. The relative contact angle of before and after treated wood sample was changed from 46.5o to 136.8o with the examination of contact angle analyzer, which induced a change of the untreated wood surface from hydrophilic to hydrophobic. As observed on SEM image, some slippery TiO2 spheres with about 300-600 nm in diameter evenly dispersed on treated wood surface.
Authors: Yong Qian Wang, Xu Dong Jiang, Chun Xu Pan
Abstract: In this paper, a micro-arc oxidation (MAO) approach is introduced for “in-situ” preparing TiO2 composite layer upon the surface of titanium alloy (Ti-6Al-4V) substrate. The surface morphologies, chemical compositions, crystal microstructure and photocatalytic properties of the layers were investigated by using a field emission scanning electron microscope (FE-SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), electro-chemical workstation and UV-Vis spectrophotometer. The experimental results revealed that photocatalytic performance of the TiO2 composite layers was much higher than that of the pure TiO2 layer and also exhibited absorption under the visible light irradiation.
Authors: Jiang Tao Shi, Qing Feng Sun, Jian Li
Abstract: Titanium dioxide nanoparticles were produced in xylem cell of living tree by in situ hydrolysis of tetrabutyl orthotitanate (TBOT) under ambient pressure and temperature. The specimens were characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDXA) and X-ray powder Diffraction (XRD) spectroscopy. From these results, spherical and uniform dispersion particles in nanoscale and anatase TiO2 crystalline phase presence in xylem cell wall of Populus ussuriensis. This work demonstrates that it is possible to generate of wood-nano biological composite material in xylem cell of living tree.
Authors: Yan Fang Shen, Wan Song, Xin Yu Cui, Tian Ying Xiong
Abstract: TiO2 is a promising photocatalyst with great potential for environment purification and energy conversion. TiO2 coatings have more advantages over powders in practical use. Cold spraying is an ideal technique to fabricate TiO2 coatings because of its low heat input compared with thermal sparing which may induce undesirable phase transformation from anatase to rutile. The paper will give a short introduction on recent development of TiO2 coatings by cold spraying. Then, the factors affecting the quality of coating should be analyzed. And finally, the bonding mechanism of cold sprayed TiO2 coating on metal substrates will also be proposed.
Authors: Wen Jie Zhang, Mei Ling Hu, Jia Wei Bai, Hong Li
Abstract: Photoelectrochemical (PEC) degradation of Procion Red MX-5B was investigated in aqueous NaCl solutions. PEC degradation efficiencies showed strong dependence on the concentrations of aqueous NaCl solutions and applied potentials. 95% decolorization of the dye could be achieved in 10 minutes at applied potential of 8 V in 0.3 M NaCl solution, while the efficiency was only 35% by photocatalytic oxidation. Electrodegradation can be as powerful as PEC degradation upon dye decolorization when the potential exceeds 5 volts. However, it can not mineralize dye degradation intermediates by itself alone. PEC degradation performed very high TOC removal capacity and nearly 80% of total organic carbon was removed in the first hour of reaction, compared with 50% removal in PCO process during the same period.
Authors: Wen Qin Wang, Xiao Long Tang, Hong Hong Yi, Jing Li Hu
Abstract: Cu-Mn/Al2O3, Cu-Mn/TiO2 and Cu-Mn/SBA-15 were prepared by incipient wetness impregnation. The activity of those catalysts for selective catalytic oxidation (SCO) of ammonia to nitrogen at low temperature (100°C~250°C) is not so satisfying. 5%Cu-5%Zr/TiO2 has the highest NH3 conversion and highest NO, NO2 yield. 5%Cu-5%Mn/Al2O3 is a promising NH3 selective catalytic oxidation catalyst, but still needs further study. SBA-15 is a bad support for Cu-Mn. Al2O3-based catalysts and TiO2-based catalysts were also prepared by incipient wetness impregnation to sure the synergistic effect between transition metal. The results find the activity on Cu-Mn/Al2O3 is better than Cu-Mn/TiO2, but NH3 conversion on Cu-Zr/TiO2 is rather well with high yield of NO. The role of supports and transition metals play in catalyst are discussed by a series of experiments. Key ward: SCO, NH3, transition metal, γ-Al2O3, TiO2, SBA-15
Authors: M.F. Achoi, Mohd Nor Asiah, Mohamad Rusop, Saifollah Abdullah
Abstract: TiO2 nanocoated mild steel surface has been successfully prepared via 100 watt of RF magnetron sputtering by using TiO2 target and sputtering condition was performed in 80sccm argon gas. The studied was done in comparing the surface properties of TiO2 nanocoated mild steel between short term and long term sputtering time at 5 and 60 minutes, respectively. From the results, we have found that the long-term sputtering time producing good surface coating with lower surface roughness at 0.033 nm with thickness in nanometer scale is 169 nm via AFM. Through Auger study revealed that the coating attributed Ti and O elements at energy of 383.48 eV and 483.44 eV, respectively. It was also showed that the intensity of that element high at about 100k a.u. in long-term compared to 55k a.u. short-term of sputtering time. It is thus showed that producing coating depends upon manipulation of parameter in RF magnetron sputtering.
Authors: Yong Gang Luo, Linda Zou, Eric Hu
Abstract: The porous TiO2 pellets were prepared based on pigment grade titaina, P25 titania powder and titanium(IV) butoxide. The characterization was done with X-Ray diffraction, scanning electron microscopy and BET measurements. The result shows that TiO2 pellets by using titanium(IV) butoxide with some addictive have the best surface porosity, with specific surface area of 196.9m2/g. For pigment grade titania and P25 titania powder, it is still effective to enhance the surface area after reassembling. The surface area increased from 11.6 to 29.2 m2/g for pigment grade titania and from 50 to 84.4 m2/g for P25 titania powder. Furthermore, it has been investigated on how to optimize and get the highest surface area by controlling the sintering temperature, reaction temperature, pH of solution, and the amount of alcohol and addictive of surfactant during preparation. The experimental photocatalytic degradation of acetone and toluene was performed using titania pellets made from P25 titania powder.
Authors: Takaharu Watanabe, Shun Fukutomi, Kozo Taguchi
Abstract: This study examines two things about a dye sensitized solar cell (DSSC) to improve power conversion efficiency. One is how to make ZnO-coated TiO2 electrode. The other is how to make carbon nanotube (CNT) electrode. First, we considered the process of making the ZnO-coated TiO2 electrode of the DSSC. This ZnO coating of the DSSC is important for the increase of power conversion efficiency. The fabrication method of the ZnO-coated TiO2 electrode was simple dip coating. This method uses the immerse of the zinc acetate dehydrate [Zn (CH3COO2)・2H2O] solution. This method can make the cheap ZnO-coated TiO2 electrode. However, this method has a slightly negative effect, which is filling in holes of the porous TiO2 layer. We tried to improve this negative effect. We changed the concentration of a zinc acetate dehydrate solution from low to high. Also, we changed the immersing time of the zinc acetate dehydrate solution. We did the control of the band gap of ZnO-coated TiO2 electrode of DSSC for increasing power conversion efficiency. Second, we substituted CNT for counter electrodes to improve the performance of DSSC. As a manufacture method of CNT electrode, we used electrophoretic deposition (EPD). After that, we baked this CNT electrode and measured its specific surface area. We tried to improve specific surface area by changing baking temperature.
Authors: Yan Bing Luo
Abstract: Organic/inorganic nanocomposites have been widely focused because of their special properties. By modifying nanoTiO2 and polylactic acid (PLA) with lactic acid, PLA/TiO2 nanocomposites was prepared, and the test on the dynamic mechanical property, thermal property, and thermal deformation temperature showed that adding nanoTiO2 helped improve PLA's mechanics property, thermal decomposition temperature, and thermal deformation temperature to certain extent.
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