Preparation and Characterization of Expanded Graphite with TiO2 Composites

The composites of expanded ghaphite with TiO2(EG/TiO2) have been prepared in the method of precursor mixing, and the optimum preparation conditions have been studied. The morphology and crystal structure of the EG/TiO2composites have been characterized by the means of SEM and XRD. Also their performance of decolorization for methyl orange solution has been researched. The results are shown as follows: the EG/TiO2composites maintain the rich porous and network structure of EG, and a lot of anatase TiO2particles widely distribute on surfaces and in layers of EG. Compared with TiO2sol, taking tetrabutyl titanate as titanium source, the prepared EG/TiO2composites have better performance. Increasing the added amount of tetrabutyl titanate, the decolorization rate of methyl orange solution increases at first, and then decreases. When adding 2 mL tetralbutyl titanate, the decolorization rate is at the peak, up to 98.4%. These results show the composites have excellent performance of decolorization for methyl orange solution. We suppose it is mainly due to the interaction between the adsorption of EG and the degradation of TiO2particles.

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Synthesis and Photocatalytic Properties of Bi2Ti2O7 Nano-Powders

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.103 ◽

2011 ◽

Vol 412 ◽

pp. 103-106 ◽

Cited By ~ 1

Author(s):

Xiao Li Su ◽

Ying Chun Zhang

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Sol Gel ◽

Spherical Shape ◽

Methyl Orange Solution ◽

Tetrabutyl Titanate ◽

Average Grain Size ◽

Structure And Microstructure ◽

Orange Solution ◽

Xrd And Tem

Bi2Ti2O7 nanopowders were prepared using bismuth nitrate and tetrabutyl titanate as starting materials by sol-gel method. The decomposition of precursors, crystal structure and microstructure of the sample was characterized by TG/DTA, XRD and TEM techniques, and the results indicate that the sample is well-crystallized pyrochlore Bi2Ti2O7 phase with spherical shape and an average grain size of 30 nm. Photocatalytic activity of Bi2Ti2O7 powders was evaluated by photodegrading methyl orange solution. The result shows that Bi2Ti2O7 has a higher photocatalytic activity than TiO2 (mixed with rutile and anatase) with the same concentration, and when concentration of Bi2Ti2O7 increased to 9g/L, half-life period T1/2 is 0.97h, then methyl orange solution can be completely degraded in more than an hour.

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Preparation and Photocatalytic Activity Research of Hollow Cubic TiO2 Particles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.558 ◽

2011 ◽

Vol 356-360 ◽

pp. 558-564

Author(s):

Xiao Wei Yuan ◽

Xue Guo ◽

Dan Dan Yang ◽

Li Juan Wang ◽

Mei Ling Cheng ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Methyl Orange ◽

Photocatalytic Property ◽

Methyl Orange Solution ◽

Tetrabutyl Titanate ◽

X Ray Diffraction ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Orange Solution

Hollow cubic TiO2particles were synthesized using cubic Cu2O particles as hard templates, and the hydrolysis of tetrabutyl titanate (TBOT). The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis spectrometer, respectively. The results show that the prepared TiO2is composed of anatase TiO2, and has a stronger absorption in the range of 300-400nm wavelengths in its UV-Vis spectroscopy. Experiments were carried out using a methyl orange solution as a model to evaluate the photocatalytic activity of hollow cubic TiO2particles. The effects of catalyst dosage, initial concentration and pH of methyl orange solution on the degree of photodegradation have been investigated. It’s found that the hollow cubic TiO2particles have a good photocatalytic property. And the degradation rate of the methyl orange, after methyl orange solution (5mg/L) containing hollow cubic TiO2particles (0.5g/L) is irradiated by 125W ultraviolet light for 120 minutes, is 95%.

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The Preparation and Sunlight Activity of Nanocomposite Photocatalysts for Degradation of Methyl Orange Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1397 ◽

2013 ◽

Vol 750-752 ◽

pp. 1397-1400 ◽

Cited By ~ 1

Author(s):

Li Mei Duan ◽

Jing Hai Liu ◽

Xiu Ting Xu ◽

Ling Xu ◽

Zong Rui Liu

Keyword(s):

Methyl Orange ◽

Synthesis Method ◽

Reaction System ◽

Methyl Orange Solution ◽

Degradation Efficiency ◽

Composite Photocatalyst ◽

One Step ◽

Orange Solution ◽

Xrd And Tem ◽

Degradation Of Methyl Orange

Applying one-step solvothermal synthesis method, different CdS/TiO2 nanocomposite materials are obtained by changing the ratio of sulfur and titanium sources. The composite structure and morphology are determined by XRD and TEM. Taking the degradation of methyl orange solution as a model reaction, the photocatalytic activity of CdS/TiO2 composite materials is investigated. The results show that the amount of CdS in composite photocatalyst has great effects on the degradation efficiency of methyl orange under the irradiation of sunlight, and the lower pH of reaction system is also needed to sustain the high degradation efficiency for methyl orange.

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Influence of Ag Doping on the Crystal Structure and Photocatalytic Activity of FeVO4

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.919 ◽

2011 ◽

Vol 197-198 ◽

pp. 919-925 ◽

Cited By ~ 2

Author(s):

Min Wang ◽

Qiong Liu

Keyword(s):

Photocatalytic Activity ◽

Methyl Orange ◽

Photoelectron Spectroscopy ◽

Methyl Orange Solution ◽

Precipitation Method ◽

X Ray Diffraction ◽

Electron Hole ◽

X Ray ◽

Orange Solution ◽

Decoloration Rate

Silver (Ag+) doped iron (III) vanadate (FeVO4) samples are prepared by the precipitation method and then characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy(XPS). The photocatalytic activity under visible light is evaluated by photocatalytic degradation of methyl orange (MO) in the solution. The results show that both FeVO4 and Ag+ doped FeVO4 samples are triclinic, the later have different surface morphology, and some needle-shaped materials appear in the later. From XPS, there are more Fe2+ ions in Ag+ doped FeVO4 sample than that in FeVO4 one without Ag+. It indicates that Ag+ doping can increase the density of the surface oxygen vacancies of catalysts, which can act as electron traps promoting the electron-hole separation and then increase the photo-activity. The decoloration rate after Ag+ doping against methyl orange solution can reach about 81%, and be more about 20％ than that of pure FeVO4.

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Photocatalytic decolorization of methyl orange solution with KIO3

Desalination and Water Treatment ◽

10.1080/19443994.2014.896288 ◽

2014 ◽

Vol 54 (8) ◽

pp. 2252-2258 ◽

Cited By ~ 1

Author(s):

Jianzhang Li ◽

Junbo Zhong ◽

Tao Wang ◽

Jun Zeng ◽

Jinjin He ◽

...

Keyword(s):

Methyl Orange ◽

Methyl Orange Solution ◽

Photocatalytic Decolorization ◽

Orange Solution

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Synthesis and Characterization of Refluxed Sols and TiO2 Thin Films Using TiOSO4

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.2189 ◽

2007 ◽

Vol 336-338 ◽

pp. 2189-2192

Author(s):

Lei Ge ◽

Ming Xia Xu ◽

Hai Bo Fang ◽

Ming Sun

Keyword(s):

Thin Films ◽

Methyl Orange ◽

Uv Light ◽

Methyl Orange Solution ◽

Light Transmittance ◽

Tio2 Films ◽

Tio2 Thin Films ◽

Photocatalytic Activities ◽

Orange Solution ◽

Degradation Of Methyl Orange

Nano anatase TiO2 thin films on glass slide substrates were prepared via a dip-coating method using refluxed sols (RS) as precursors, then dried under infrared light and calcined at 500°C for 30min. The RS sols and TiO2 films were characterized by FT-IR, XRD, TEM, UV-Vis and SEM. The photocatalytic activities of the film samples were tested by the degradation of methyl orange solution with a concentration of 10mg/L under UV light irradiation. The results reveal that the RS sols are flavescent, alkalescent and contain needle-like anatase crystals. The TiO2 films are uniform, compact and transparent, their maximal light transmittance exceed 80% under visible light region. The degradation of methyl orange results illustrate that the RS-6 TiO2 thin films show the best photocatalytic activities, the decoloration rate of the methyl orange solution with RS-6 TiO2 thin films reachs 99% after irradiated 160min under UV light.

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Preparation and Characterization of La-B Co-Doped TiO2 Photocatalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.859.333 ◽

2013 ◽

Vol 859 ◽

pp. 333-336

Author(s):

Hai Chun Chen ◽

Xiao Bei Pei

Keyword(s):

Methyl Orange ◽

Photocatalytic Degradation ◽

Surface Area ◽

Pore Volume ◽

Degradation Rate ◽

Solvothermal Method ◽

Tetrabutyl Titanate ◽

Degradation Activity ◽

Co Doped

La-B-TiO2photocatalysts were prepared using tetrabutyl titanate, tributyl borate, and lanthanum chloride as the precursors by solvothermal method. The prepared sample is composed of irregular particles with fairly rough surface in the size within 5 μm. Large surface area and pore volume are benefit to adsorption and photocatalytic degradation activity of the materials. Pore size of the 1%La-3%B-TiO2sample mainly distributes in the range between 5-35 nm. Specific surface area of the material is 101.45 m2/g. The sample containing 0.5% La presents the maximum decoloration efficiency. When La content is 0.5%, methyl orange adsorption rate on the material is less than 5%, and photocatalytic degradation rate is 39.9%.

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The Application of Modified Nanometer Titanium Dioxide in Degradation of Methyl Orange Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.750-752.1401 ◽

2013 ◽

Vol 750-752 ◽

pp. 1401-1404

Author(s):

Xin Qian Shu ◽

Zhi Qiang Shan

Keyword(s):

Methyl Orange ◽

Doping Concentration ◽

Sol Gel ◽

Methyl Orange Solution ◽

Optimum Concentration ◽

Thin Membrane ◽

Glazed Ceramic ◽

Gel Processing ◽

Orange Solution ◽

Degradation Of Methyl Orange

The nanometer TiO2 thin membrane on different substrates doped with La3+ was prepared from Ti (OC4H9)4 and La (NO3)3 by Sol-Gel processing using dipping technique. The photocatalytic activity of membrane at different doping concentration in photocatalytic methyl orange was studied. The result showed that both the degraded rate and the optimum concentration depended on the change of doping concentration and substrates. When TiO2 thin membrane was doped with 0.5 La3+ on the substrates of glazed ceramic, aluminum and stainless steel, TiO2 membrane has the maximum degradation rate.

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