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Search Results: 1 - 10 of 48851 matches for " TiO2/Zeolite "
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EFFICIENCY EVALUATION OF NaY ZEOLITE AND TiO2/NaY ZEOLITE IN REMOVAL OF METHYLENE BLUE DYE FROM AQUEOUS SOLUTIONS
M. Zendehdel,Z. Kalateh,H. Alikhani
Iranian Journal of Environmental Health Science & Engineering , 2011,
Abstract: In this study titanium dioxide cluster was incorporated onto NaY zeolite and characterized with X-Ray diffractometer and X-ray spectroscopy. These composites have many advantages such as high stability and high porosity. The adsorption behavior of methylene blue was investigated for NaY zeolite and TiO2/NaY zeolite. The efficiency of time, pH, temperature and initial concentration of methylene blue (MB) on removal effect of methylene blue was investigated by UV-Vis spectroscopy. And, the optimum conditions were determined 8h time, basic pH and high initial concentrations of methylene blue and absorbent. With increasing of temperature, the removal efficiency of NaY zeolite and TiO2/NaY increased. Results showed that 92% and 85% of methylene blue was absorbed by synthesized NaY zeolite and TiO2/zeolite, respectively. Adsorption isotherm as studied by fitting data to Langmuir and Freundlich isotherms models, showed monolayer adsorption and Langmuir equilibrium model to be more relevant.
鞭毛模板制备贵金属纳米颗粒/TiO2复合薄膜及光催化活性研究 Flagella-Templated Process to Noble Metal Nanoparticles/TiO2 Composite Films and Their Photocatalytic Activity  [PDF]
王莉霞,翁永根,何涛,徐金光
Material Sciences (MS) , 2013, DOI: 10.12677/ms.2013.33023
Abstract: 通过大肠杆菌鞭毛控制Au和Ag的纳米颗粒的生长及组装,获得稳定的鞭毛/金属纳米颗粒分散液。以此分散液以及透析钛溶胶为原料,通过浸渍提拉法制备TiO2/Au(Ag)/TiO2夹心结构的复合薄膜。通过透射电子显微镜(TEM)、紫外–可见分光光度计(UV-visible spectroscopy)对鞭毛、鞭毛/贵金属纳米颗粒进行表征。研究发现,该复合膜的夹心结构起到了稳定金属纳米颗粒的作用,而金属纳米颗粒的引入赋予了该复合膜可见光催化活性。 In this work, flagella are used to control over the growth and assembly of Au and Ag nanoparticles, and a stable dispersion of flagella/metal nanoparticle is successfully obtained. A composite film with a TiO2/Au(Ag)/TiO2 sandwich structure is prepared by means of a dip-coating method where a dialyzed TiO2 solution and flagella stabilized Au and Ag nanoparticles are used as raw materials. TEM and UV-visible spectroscopy characterizations reveal that the sandwich structures play a role in stabilizing metal nanoparticles in the composite films and visible light photocatalytic activity is attributed to the existence of Au and Ag nanoparticles.
Fabricated Antibacterial and Bioactive Titania Nanotube Arrays Coating on the Surface of Titanium  [PDF]
Tian Tian, Haicheng Dong, Xiaoting Tian, Yafei Hao
Open Journal of Safety Science and Technology (OJSST) , 2013, DOI: 10.4236/ojsst.2013.33007
Abstract:

By photic-assisted deposition, Ag nanoparticles were assembled on bioactive TiO2 nanotube arrays, which were fabricated by anodic oxidation in 0.5 wt% NH4F solution containing 0.5 wt% Na2HPO4. The samples were characterized by scanning electron mincroscope (SEM), X-ray diffraction (XRD). Germiculture experimentation was employed to testing samples’ antibacterial capability. An obvious antibacterial ring appeared around the Ag modified samples, indicating that Ag modified titania nanotube arrays has good antibacterial capability.

水热法制备掺杂钇的二氧化钛及其对甲醛气敏性能研究
Study on Synthesis of TiO2 Doped with Yttrium by Hydrothermal Method and the Gas Sensing Properties towards Formaldehyde
 [PDF]

宋金玲, 凡庆南, 周长才, 蔡颖, 张胤
Hans Journal of Nanotechnology (NAT) , 2013, DOI: 10.12677/NAT.2013.34008
Abstract:
本文首先通过溶凝胶法和水热法制备了TiO2粉末和掺杂稀土离子YTiO2粉末,并通过X-射线衍射谱(XRD)对制备的样品结构进行了表征,结果表明,制备的TiO2粉末为锐钛矿结构;稀土离子的掺杂抑制了TiO2晶粒生长。其次通过气敏测试仪测试所制备的样品对甲醛的气敏性,结果发现水热法制备的掺杂YTiO2(TiO2:Y-HT)对甲醛有较高的灵敏性。并进一步研究了该样品对甲醛浓度的敏感性、响应恢复时间以及在不同温度下的敏感性,结果显示,最佳操作温度为250,随着浓度的增加呈现增加的趋势,响应时间约为30 s,恢复时间约为35 s
>In this paper, the TiO2 powder and TiO2 powders doped with yttrium ion have been prepared by the sol-gel method and hydrothermal methods, and the structures of the samples have been characterized by the XRD. The results of XRD indicate that the structure of prepared TiO2 powder is anatase and rare earth ion doping agents can
Composite of TiO2/Zeolite Structure and Photocatalytic Reactivity
TiO2/沸石复合物结构与光催化性能

JIANG Yin-Shan,JIN Wei-Qun,ZHANG Jun,FANG Song-Sheng,
蒋引珊
,金为群,张军,方送生

无机材料学报 , 2002,
Abstract: TiO2/zeolite composite photocatalysts were prepared in the water with natural zaolite and TiCl4, and the structure characterization was carried out by X-ray, IR and TG-DTA. Their photcatalytic reactivity was studied by the methyl orange and methylene blue solution decomposition effect under the sun. The results confirm that the anatase forms on the zeolite surface, and the mineral structure changes and the photocatalytic effect of low temperature treatment is more excellent than that of higher temperature treatment, the decolouration rate is in the vicinity of 100%, and can be repeatedly used.
Photochemical Properties of Precipitated Solid Aerosol Produced by Burning of Titanium Microparticles under Ambient Air  [PDF]
Valery Zakharenko, Sophia Khromova
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.12017
Abstract: In order to neutralize a drastic pollution of the environment (technogenic catastrophe) it is suggested to use technogenic technologies of chemical compound decontamination. One in such technologies can be the technology using metal oxide solid aerosols which are active in removal of pollutant compounds and obtainable by combustion under ambient air of appropriate metal particles, for example, aluminum, magnesium, titanium and etc. It is shown that the titanium dioxide out of an solid aerosol, obtained by pyrotechnic mixture combustion containing titanium microparticles has optic, chemical and photocatalytic properties close to properties of titanium dioxide produced by a different way. The production of such aerosol in direct place of a technogenic catastrophe can be made for the cleaning of atmosphere near a pollution source.
Photocatalytic Degradation of Ethylene Dichloride in Water Using Nano TiO2 Supported on Clinoptilolite as a Photocatalyst  [PDF]
Manouchehr Nikazar, Soheil Jalali Farahani, Mastaneh Reza Soltani
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24b066
Abstract:   processes (AOP) combined methods, photocatalyst /H2O2, isutilized in order to study photodegradation of ethylene dichloride (EDC) in water. Nano Titanium (IV) Oxide,supported on Clinoptilolite (CP) (Iranian natural zeolite) using solid-state dispersion (SSD) method for improvement of itsphotocatalytic properties. The results show that the TiO2/Clinoptilolite (SSD) is an active photocatalyst. The effectsof five important photocatalytic reaction parameters including the initial concentration of ethylene dichloride, the ratio of TiO2/Clinoptilolite, the catalyst concentration, H2O2 concentration and pH in photodegradation of ethylene dichloride were examined. In this experiments, the design and also the optimum parameters were obtained by Taguchi Method, using Design Expert8? software. Taguchi's L27 (5^3) orthogonal array design was employed for the experimental plan. Four parameters were found to be significant whereas, pH was found to be an insignificant parameter after conducting experiments. A first order reaction with K = 0.007 min-1 was observed for the photocatalytic degradation reaction.
Decorating and Filling of Multi-Walled Carbon Nanotubes with TiO2 Nanoparticles via Wet Chemical Method  [PDF]
Sedigheh Abbasi, Seyed Mojtaba Zebarjad, Seyed Hossein Noie Baghban
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.52030
Abstract:

Multi-walled carbon nanotubes (MWCNTs) have been successfully modified with TiO2 nanoparticles via wet chemical method. For this purpose tetra chloride titanium (TiCl4) was used as titanium source. MWCNTs were exposed at different amount of TiCl4 (0.25 and 0.1 ml) and different soaking times. The modified MWCNTs have been characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM results showed that the MWCNTs were fully decorated with TiO2 at short term immersion. Increasing soaking time caused to fill the MWCNTs with TiO2 nanoparticles. The results showed that the amount of precursor had a significant role on quantity of decoration. The decoration of outer surface of MWCNTs with TiO2 was more noticeable at large amount of TiCl4. XRD results revealed that the crystalline structure of TiO2 on the surface and inner of MWCNTs was rutile. The average size of TiO2 nanoparticles which modified MWCNTs were 20 nm.

Novel EPS/TiO2 Nanocomposite Prepared from Recycled Polystyrene  [PDF]
G. M. Herrera-Sandoval, D. B. Baez-Angarita, S. N. Correa-Torres, O. M. Primera-Pedrozo, S. P. Hernández-Rivera
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.43021
Abstract:

The synthesis and characterization of a new nanocomposite material that was prepared from recycled expanded polystyrene (EPS) and titanium dioxide (TiO2) is reported here. The EPS was obtained from chemical reagent box insulation. To obtain the nanocomposite, these materials were dispersed in a solvent, mixed with TiCl4 and heated. The resulting new material was characterized with SEM, TEM, TGA, BET, Raman and IR techniques. The Raman and IR spectra provided complementary information regarding the structure of the nanocomposite. The Raman spectra were used to identify the crystalline structure of TiO2 in the nanocomposite. In contrast, the IR spectra were used to identify the organic portion of the nanocomposite. The TEM images indicated that the nanocomposites had an average particle size of 6 - 12 nm. In addition, the adsorption and photocatalytic properties of the new material were evaluated. The EPS/TiO2 nanocomposite was efficient at degrading methylene blue (MB) dye solutions under UV irradiation. Furthermore, according to thermal analysis, this material had greater polymer stability due to the incorporation of TiO2.

二氧化钛的尺寸与光催化活性的关系
孙奉玉,吴鸣,李文钊,李新勇,顾婉贞,王复东
催化学报 , 1998,
Abstract: ?
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