Preparation of TiO_2 film on granulated ceramic and application of disposal in water

Early research mainly studies the performance of TiO2 power condition.As a result of using power condition TiO2,its power is slight,not easy to precipitate,and creates another pollutants.Therefore,the ceramic granulated substance carrier material was used to prepare the TiO2 thin film to carry on the water treatment to obtain the good effect.The gangue of coal was used to make the ceramic granulated substance basis,then in a ceramic granulated basis place TiO2 thin film was painted,advancing together the running water processing experiment.The test result is as follows:The TOC content reduces by above 80%,and used to filter the material to be possible to replace at will,which has obtained good effect.In the testing,using the scanning electron microscope analyzer,carrying on the superficial appearance view to the TiO2 ceramic sand leach material to scratch,finally indicated,it has some turtle crack in the TiO2 ceramic granulated substance surface,has crystal boundary surface flaw,causes it to have bigger catalytic activity.

TiO_2 thin film photocatalyst

It is well known that the photocatalytic activity of TiO_2 thin filmsstrongly depends on the preparing methods and post-treatment conditions, since they have a decisiveinfluence on the chemical and physical properties of TiO_2 thin films. Therefore, it is necessary toelucidate the influence of the preparation process and post-treatment conditions on thephoto-catalytic activity and surface microstructures of the films. This review deals with thepreparation of TiO_2 thin film photo-catalysts by wet-chemical methods (such as sol-gel,-reversemicellar and liquid phase deposition) and the comparison of various preparation methods as well astheir advantage and disadvantage. Furthermore, it is discussed that the advancement ofphotocatalytic activity, super-hydrophilicity and bactericidal activity of TiO_2 thin filmphotocatalyst in recent years.

Rapid communication Preparation of TiO_2 nanometer thin films with high photocatalytic activity by reverse micellar method

Two kinds of TiO_2 nanometer thin films were prepared on stainless steel bythe reverse micellar and sol-gel methods, respectively. The calcined TiO_ 2 thin films werecharacterized by X-ray diffraction (XRD), atomic force microscopy (AFM), BET surface area and X-rayphotoelectron spectroscopy (XPS). Photocatalytic activity was evaluated by photocatalyticdecoloration of methyl orange aqueous solution. The results showed that the TiO_2 thin filmsprepared by reverse micellar method (designated as RM-TiO_2 films) showed higher photocatalyticactivity than those by sol-gel method (designated as SG-TiO_2 films). This is attributed to the factthat the former is composed of smaller monodispersed spherical particles with a size of about 15 nmand possesses higher surface areas.

Preparation and Characterization of Nanotitanium Dioxide Coating Film Doped with Fe^(3+) Ions on Porous Ceramic

The nanotitanium dioxide （TiO2） photocatalytic and porous ceramic filtering technique is one of the advanced methods to effectively treat organic wastewater. The TiO2 sol doped with Fe^3＋ ions was prepared by sol-gel processing. The influences of the process conditions of coating nanophotocatalytic material- Fe^3＋-TiO2 film on the surface of porous ceramic filter by dipping-lift method on the performance of porous ceramic filter were studied. The porous ceramic filters have two functions at the same time, filtration and photocatalytic degradation. The results of this study showed that the pH and viscosity of the sol, amount of Fe^3＋ ions doped as well as the coating times greatly affect the quality of coating film, the performance parameters and the photocatalytic activity of the porous ceramic filter. When the pH of the sol is 3-4, the viscosity is about 6 mPa.S, the amount of doped Fe^3＋ ions is about 2.0 g/L, the porous ceramic filter has been shown to have the best filtering performance and photocatalytic activity. In this condition, the porosity of porous ceramic is about 42.5%, the pore diameter is 8-10μm. The degradation of methyl-orange is 74.76% under lighting for 120 rain.

Preparation and Characterization of Nano-ZnFe_2O_4/TiO_2 Films

The nano-ZnFe2O4/TiO2 films possess the functions of desulfurization and degradation for organic pollutants. The sols of ZnFe2O4/TiO2 were prepared by sol-gel method and coated on glass and porous ceramic by vertical coating and dipping-lift processes, respectively, and the samples were obtained after drying and sintering. The composition, appearance, absorption spectrum of the films, and the influence of the film on porous ceramic performances were analyzed using SEM, AFM, UVVis spectrometer, and mercury porosimeter, respectively, to determine the operation parameters of the multifunction porous ceramic elements for gas-purification.

TiO_2 Thin Film UV Detectors Deposited by DC Reactive Magnetron Sputtering

Crystalline TiO2 thin films were prepared by DC reactive magnetron sputtering on indium-tin oxide（ITO） thin film deposited on quartz substrate, the photoconductive UV detector on TiO2 thin films was based on a sandwich structure of C/ TiO2/ITO. The measurement of the I-V characteristics for these devices shows good ohmic contact. The photoresponse of TiO2 thin films was analyzed at different bias voltage. The detector shows a good photoresponse with a rise time of 2 s and a fall time of 40 s, the photocurrent is linearly increased with the bias voltage.

Effects of Composition of ZnO Ceramics Containing TiO_2 onVaristor Properties

The development of low-voltage ZnO varistor ceramics containing TiO2 is presented in this report. The varistor properties of ZnO ceramics with different compositions were measured, and microstructure of the ceramics was investigated by XRD and SEM. The results show that the addition of TiO2 is beneficial to the decrease of varistor voltage (V1mA). whereas it leads to the recession of nonlinear coefficient (α) and leakage current (lL). The varistor properties of ZnO ceramics containing TiO2 can be effectively improved by introducing moderate amount of pre-fabricated ZnO seed grains. The behaviors of TiO2 and seed grains, as well as the mechanisms by which TiO2 and seed grains influence varistor properties, are discussed.

Influence of TiO_2 seeding layers on phase composition of lead magnesium niobate-lead titanate thin films prepared by RF magnetron sputtering

The influence of amorphous TiO_2 seeding layers on the phase composition of lead magnesium niobate-lead titanate(0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3,PMN-PT) films deposited on Pt/Ti/SiO2/Si substrate by RF magnetron sputtering was examined.The relation between seeding layer thickness and phase composition at different post annealing temperature was observed by XRD.The thickness of amorphous TiO2 seeding layer and post annealing temperature had remarkable effects on PMN-PT film phase composition.When amorphous seeding layer becomes thick,a new phase of Nb2O5 exists in the films.Only when the seeding layer thickness is suitable,the film with pure perovskite phase can be attained.

Fabrication and Fluorescence Study of Sensitizing Dye/TiO_2 Films

Fluorescence spectra of the sensitizing dye/ TiO2 bilayer films were studied. Charge-transfer complexes were formed in the above bilayer.

Sensitizing Mechanism and Adsorption Properties of Dye-sensitized TiO_2 Thin Films

The dye-sensitized TiO2 complex films were prepared by the dye coat onto TiO2 surfaces, and the sensitizing mechanism and adsorption properties of the dye-sensitized TiO2 complex films were investigated. The influence of the application conditions of dye adsorbed on TiO2 films on the amount of dye adsorption was discussed. Experimental results show that the concentration, the temperature of dye solutions and the dipping time of TiO2 films in the dye solutions have a significant influence on the amount of dye adsorption. Cell test indicates that the conversion efficiency of light to electricity increases with the amount of dye adsorption.

TiCl_4水解法制备TiO_2薄膜的表征及光催化性能

以TiCl4水解法,采用浸渍提拉法在玻璃片上制备TiO2纳米薄膜。用XRD及SEM、EDS测定和表征TiO2薄膜的表面形貌和结构特性,以UV吸收光谱和可见光透光率表征薄膜的光学特性。结果表明,所得薄膜负载质量与镀膜次数有很好的线性关系,镀膜4次的TiO2薄膜具有表面均匀、厚度约为0 192μm,粒子粒径约为5.0nm,对紫外光强烈吸收并有红移拓宽。TiO2薄膜作为催化剂对500mL的20mg/L乙酸的降解率达到75.9%,比等负载量的粉末TiO2光催化的48.0%降解率高27.9%。

TiO_2光催化降解聚乙烯薄膜

以快速溶胶法制备了纳米TiO2光催化剂,用于室温下固相光催化降解聚乙烯(PE)包装薄膜的研究。对催化剂和薄膜进行了X射线衍射分析,傅立叶红外光谱分析,扫描电子显微镜形貌观察。结果表明,15W紫外光辐射240h后,PE质量损失为7.66%,金红石型纳米TiO2光催化剂使PE质量损失14.93%,锐钛矿型纳米TiO2光催化剂使PE质量损失23.97%;TiO2加速了高分子碳链的断裂和光氧化,在薄膜表面形成大量的凹坑,降解产物中小分子量的石蜡含量明显增高,锐钛矿型纳米TiO2光催化降解PE的活性高于金红石型纳米TiO2。

TiO_2-K_2O-LiZnVO_4陶瓷薄膜的制备及其湿敏性能研究

】采用溶胶凝胶法制备了ＴｉＯ２－Ｋ２Ｏ－ＬｉＺｎＶＯ４陶瓷薄膜湿敏元件，研究了薄膜的结构和元件的感湿性能。薄膜主要由金红石型ＴｉＯ２构成，化学组成为Ｔｉ∶Ｋ∶Ｌｉ∶Ｚｎ∶Ｖ∶Ｏ＝１∶０．０４∶０．１∶０．１∶０．１∶２．４２（原子摩尔比）。工作频率为４０Ｈｚ时，湿敏元件在全湿度范围内具有良好的阻抗－湿度特性及电容－湿度特性，感湿特性曲线线性良好。元件还具有灵敏度高，滞后小，响应快，长期稳定性好等优点。工作频率和温度对感湿性能有一定影响。

连续片状纳米TiO_2薄膜的制备和表征(英文)

采用溶胶 凝胶法,通过在制备过程中加入丙烯酸对纳米TiO2胶体颗粒进行表面修饰以及加入引发剂偶氮双异丁腈(AIBN)引发丙烯酸聚合,利用提拉法在载玻片表面制备了纳米TiO2薄膜;采用热分析仪考察了纳米TiO2胶体颗粒中有机物的热解行为,并用X射线衍射仪测定了经不同温度下焙烧后的纳米TiO2粉体的晶体结构;采用原子力显微镜和透射电子显微镜观察分析了薄膜的微观结构;在对不同制备条件下制备的纳米TiO2干胶进行红外光谱分析的基础上,初步考察了薄膜成膜机理 结果表明,所制备的TiO2薄膜经400℃烧结处理后形成连续、片状。

溅射—阳极氧化法在釉面砖上制备多彩TiO_2膜

采用直流磁控溅射法先在釉面砖上镀制一层 Ti膜 ,然后采用阳极氧化法制备透明的 Ti O2 薄膜。根据光的干涉原理 ,控制 Ti O2 膜的厚度 ,制备了土黄、深兰、浅兰、金黄、粉红、紫红。

Uniform deposition of ultra-thin TiO_(2) film on mica substrate by atmospheric pressure chemical vapor deposition: Effect of precursor concentration

The performance of pearlescent pigment significantly affected by the grain size and the roughness of deposited film. The effect of TiCl_(4) concentration on the initial deposition of TiO_(2) on mica by atmospheric pressure chemical vapor deposition(APCVD) was investigated. The precursor concentration significantly affected the deposition and morphology of TiO_(2) grains assembling the film. The deposition time for fully covering the surface of mica decreased from 120 to 10 s as the TiCl_(4) concentration increased from 0.38%to 2.44%. The grain size increased with the TiCl_(4) concentration. The AFM and TEM analysis demonstrated that the aggregation of TiO_(2) clusters at the initial stage finally result to the agglomeration of fine TiO_(2) grains at high TiCl_(4) concentrations. Following the results, it was suggested that the nucleation density and size was easy to be adjusted when the TiCl_(4) concentration is below 0.90%.

Humidity sensing properties of spray deposited Fe doped TiO_(2)thin film

In the present work,ferrite(Fe)doped TiO_(2)thin films with different volume percentage(vol%)were synthesized using a spray pyrolysis technique.The effect of Fe doping on structural properties such as crystallite size,texture coefficient,microstrain,dislocation densities etc.were evaluated from the X ray diffratometry(XRD)data.XRD data revealed a polycrystalline anatase TiO_(2)phase for sample synthesized up to 2 vol%and mixed anatase and rutile crystalline phase for sample synthesized at 4 vol%Fe doped TiO_(2).The crystalline size was observed to decrease with increase in Fe dopant vol%and also other structural parameters changes with Fe dopant percentage.In the present work,electrical resistance was observed to decrease with a rise in Fe dopant vol%and temperature of the sample.Thermal properties like temperature coefficient of resistance and activation energy also showed strong correlation with Fe dopant vol%.Humidity sensing properties of the synthesized sample altered with a change in Fe dopant vol%.In the present paper,maximum sensitivity of about 88.7%for the sample synthesized with 2 vol%Fe doped TiO_(2)and also the lowest response and recovery time of about 52 and 3 s were reported for the same sample.

Improved photocatalytic performance of gradient reduced TiO2 ceramics with aligned pore channels

Magn-eli,a fascinating sub-stoichiometric titanium oxide phase that contains oxygen vacancies of TiO_(2),is proposed as a potential photo-electrode for photocatalysis due to its high conductivity and photoelectric conversion efficiency.In this work,partially reduced porous TiO_(2) ceramics with a graded reduction profile and an aligned pore structure were prepared by carbo-thermal reduction of freeze-cast TiO_(2) with a range of porosities from 10 to 30 vol.%.AC conductivity evaluation revealed that the oxygen vacancies that exist in Magn-eli lead to a relatively high AC conductivity of~10 S/m at 1 kHz,as compared to that of the stoichiometric porous TiO_(2).A maximum photocurrent density and incident photon-to-current efficiency(IPCE)of 9.14 mA/cm^(2) and 40.52%respectively were achieved from the gradient porous Magn-eli with a porosity of 30 vol.%.

Comparison on Morphological and Optical Properties of TiO_(2) Thin Films Grown by Single-Pulse and Multi-Pulse Laser Ablation

TiO2 thin films were prepared on glass substrates using the PLD (Pulsed Laser Deposition) technique. In order to carry out the ablation process, a Nd:YAG laser was used emitting in 1064 nm wavelength at 10 Hz repetition rate, set up for operating in both single-pulse and multi-pulse regimes. A comparison of the deposition rate, the optical and morphological properties of the layers obtained from both ablation regimes was made, which showed that the multi-pulsed ablation produced layers with a higher surface quality and better optical properties.

Photocatalytic degradation of organochlorine compounds using TiO_2 supported on fiberglass cloth

The feasibility of photocatalytic degradation of organochlorine compounds using TiO 2 supported on fiberglass cloth as a photocatalyst was studied. The results showed that 2 0×10 -4 mol/dm 3 of dichloroethylene, trichloroethylene and tetrachloroethylene can be completely photocatalytically degraded within a short time under illumination with a 375W medium pressure mercury lamp. The effects of parameters such as illumination time, initial concentration of organochlorine compounds, amount of air flow and concentration of H 2O 2 on the photocatalytic degradation were investigated. The TiO 2 supported on the fiberglass was not easily detached and after 500h illumination there was no significant loss of photocatalytic activity of TiO 2. The passible mechanisms of photocatalytic degradation were discussed.