Study on Synthesis and Photocatalytic Activity of Titanium Dioxide/Tungsten Oxide

2011 ◽  
Vol 233-235 ◽  
pp. 2832-2835
Author(s):  
Dao Xin Wu ◽  
Zhou Lan Yin ◽  
Qi Yuan Chen ◽  
Jie Li ◽  
Ke Long Huang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Low Temperature ◽  
Tungsten Oxide ◽  
Light Source ◽  
Catalyst Concentration ◽  
Degradation Efficiency ◽  
Photodegradation Efficiency ◽  
Hydrolysis Process

Originated from(C4H9O)4Ti, TiO2was synthesized by low temperature hydrolysis process in this paper. After being prepared by decomposing ammonium tungstate and covering on the surface of TiO2, TiO2/WO3were characterized by XRD, DRS, FS. With sunlight as the light source, pH=5.0, catalyst concentration was 1.0g.L-1, concentration of methyl orange was 5.0mg.L-1.It has been shown that TiO2/WO3powders(15%,873K) has the most photodegradation efficiency, and the degradation efficiency of 95% after 4 hours.

Research on Visible Light Photocatalytic Performance of Tungsten Doped TiO2

2011 ◽  
Vol 236-238 ◽  
pp. 399-402
Author(s):  
Dao Xin Wu ◽  
Zhou Lan Yin ◽  
Qi Yuan Chen ◽  
Jie Li ◽  
Ke Long Huang
Keyword(s):  
Methyl Orange ◽  
Low Temperature ◽  
Visible Light ◽  
Crystalline State ◽  
Photocatalytic Performance ◽  
Catalyst Concentration ◽  
Tetrabutyl Titanate ◽  
Photodegradation Efficiency ◽  
Rutile Titania ◽  
Visible Light Photocatalytic

In this paper, W-doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate. Powers were characterized by XRD、DRS、PL. At 1073K, Doped concentration have been in a certain range, Tungsten could be doped into the lattice of rutile TiO2in the way of replacement, which would cause no change in rutile TiO2crystalline state with sunlight as the light source, pH=2.0, catalyst concentration was 1.0g.L-1, concentration of methyl orange was 5.0mg.L-1. It has been shown that Tungsten doped TiO2powders(1.0%,1073K) has been the most photodegradation efficiency, and the degradation efficiency was 96.8% after 12h.

Low Temperature Solvolthermally Synthesized Nitrogen-Fluorine Doped TiO2 for Methyl Orange Photodegradation

2012 ◽  
Vol 488-489 ◽  
pp. 98-102
Author(s):  
Tanagorn Kwamman ◽  
Siwaporn Meejoo Smith
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Low Temperature ◽  
High Efficiency ◽  
Solvothermal Method ◽  
Visible Region ◽  
Titanium Isopropoxide ◽  
Decolorization Efficiency ◽  
Photocatalytic Applications

A low temperature solvothermal method was employed to synthesize nitrogen-fluorine doped TiO2 materials (N/F -TiO2) at various mole ratio of Ti:F; 10:1, 10:0.3 and 10:0.1, for photocatalytic applications. Doping fluorine and nitrogen in the TiO2 structure extend the spectra response of the materials toward a visible region resulting in the high efficiency to oxidize methyl orange (MO) under UV-Vis irradiation. The microstructure and photocatalytic activity of the materials appeared to depend on titanium precursors, titanium isopropoxide (TTIP) or tetrabutyl orthotitanate (TBOT), and the concentration of dopant (NH4F). The highest MO decolorization efficiency under UV-Vis irradiation for 30 minutes is about 86 % by using N-F-TiO2 (TTIP precursor) with Ti: F of 10: 3 as catalyst. The decolorization efficiencies of MO over N-F-TiO2 materials (TTIP precursor) are twice higher than that of the undoped catalyst.

Preparation of WOx-TiO2 and the Photocatalytic Activity under Visible Irradiation

2007 ◽  
Vol 336-338 ◽  
pp. 1979-1982 ◽  
Author(s):  
Hai Yan Song ◽  
Hong Fu Jiang ◽  
Xing Qin Liu ◽  
Yin Zhu Jiang ◽  
Guang Yao Meng
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Tungsten Oxide ◽  
Tungsten Oxides ◽  
Tio2 Particles ◽  
Visible Light Range ◽  
Visible Irradiation ◽  
Doped Titanium Dioxide

Nanocrystalline tungsten oxide doped titanium dioxide (WOx-TiO2) powders were prepared by TiCl4 hydrolysis and characterized by XRD, XPS, UV–Vis absorption spectra and TEM. Results showed that WOx not only hindered the growth of TiO2 particles but also greatly increased the transformation temperature (>800 oC) from anatase to rutile during sintering; the dominant fraction of tungsten oxides was non-stoichiometric tungsten oxide (WxOy) with Wn+ (4<n<6), which could easily substitute Ti4+ in the lattice of TiO2. The light absorption band of TiO2 changed from the near UV to the visible light range (2.68 eV in 1.0 %WOx-TiO2) because of the tungsten impurity energy level induced by WxTi1-xO2. The photocatalysis experiments demonstrated that the MB in aqueous solution was successfully degraded within 1h using WOx-TiO2 with an optimal WOx dosage of 1% under visible light irradiation.

Hydrothermal Synthesis and Characterisation of Cu Doped TiO2 Nanotubes for Photocatalytic Degradation of Methyl Orange

2014 ◽  
Vol 911 ◽  
pp. 126-130 ◽  
Author(s):  
Mohd Hasmizam Razali ◽  
M.N. Ahmad-Fauzi ◽  
Abdul Rahman Mohamed ◽  
Srimala Sreekantan
Keyword(s):  
Electron Microscopy ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
High Surface ◽  
High Surface Area ◽  
Morphological Studies ◽  
Doped Titanium Dioxide ◽  
Degradation Of Methyl Orange

Copper doped titanium dioxide (Cu-TiO2) nanotubes were synthesised by hydrothermal method. The samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and nitrogen gas adsorption. The photocatalytic activity of the copper doped titanium dioxide nanotubes was investigated by photodegradation of methyl orange under UV light. The structural and morphological studies showed that, the copper was incorporated into interstitial positions of the TiO2lattice to form a new phase of TiO2(hexagonal). The copper doped TiO2nanotubes possessed high surface area and pore volume, results high photocatalytic activity for degradation of methyl orange (MO).

Synthesis and Photocatalytic Activity of Silicon-Substituted Hydroxyapatite

2014 ◽  
Vol 636 ◽  
pp. 115-117
Author(s):  
Ke Jun Liu ◽  
Hua Guang Yu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Degradation Efficiency

Series of silicon-substituted hydroxyapatite were prepared and characterized, and their ability to degrade methyl orange and Congo red in aqueous solutions were studied. The effect of substituted silicon amount on the photocatalytic degradation efficiency of the dyes was investigated. The substitution of SiO44− groups for PO43− groups caused OH− loss and difference in the microstructure of hydroxyapatite, and the elimination rates of silicon-substituted hydroxyapatite decreased with the increasing of substituted silicon amount compared to that of pure hydroxyapatite.

Porous ceramic foam loading titanium dioxide for photocatalytic degradation of the methyl orange solution

2019 ◽  
Vol 15 (6) ◽  
pp. 1366-1378
Author(s):  
Y.J. Guo ◽  
W. Cheng ◽  
P.S. Liu
Keyword(s):  
Titanium Dioxide ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Porous Ceramic ◽  
Degradation Efficiency ◽  
Ceramic Foam ◽  
Raw Material ◽  
Polymer Foam ◽  
Content Type ◽  
Wide Range

Purpose The purpose of this paper is to provide an investigation on a new kind of photocatalytic material, namely, the porous ceramic foam loading titanium dioxide, which can make an effective photocatalytic degradation of the methyl orange (MO) solution in the wastewater. Design/methodology/approach The natural zeolite powder has been used as the primary raw material to produce a sort of lightweight porous ceramic foam by impregnating polymer foam in slurry and then sintering. With the sol-gel method, a kind of open-cell reticular porous ceramic foam loading TiO2 film was obtained having a good photocatalytic action, and the resultant porous composite product presents the bulk density of 0.3~0.6 g/cm3 to be able to float on water. Findings The MO could tend to be completely degraded in the solution with a certain concentration by the TiO2-loaded ceramic foam irradiated with ultraviolet light, and this composite foam was found to have high degradation efficiency for the MO solution in a wide range of pH. Originality/value This work presents a TiO2-loaded ceramic foam that can effectively photo-catalyze to degrade the MO in water, and the degradation efficiency were examined under different conditions of the MO solution with various pH values.

Fabrication and characterization of CdS doped TiO2 nanotube composite and its photocatalytic activity for the degradation of methyl orange

2015 ◽  
Vol 72 (8) ◽  
pp. 1341-1347
Author(s):  
Jinwook Chung ◽  
Seu-Run Kim ◽  
Jong-Oh Kim
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Pure Tio2 ◽  
Tio2 Nanotube ◽  
Doped Tio2 ◽  
Photodegradation Efficiency ◽  
Uv Light Irradiation ◽  
Fabrication And Characterization

CdS doped TiO2 nanotube composite was fabricated by chemical bath deposition, and was characterized by the structural, spectral and photoelectrochemical properties. The results of the structural and spectral properties showed that CdS particles were successfully deposited onto the surface of TiO2 nanotube. It is demonstrated that CdS doped TiO2 nanotube composite improved the light harvesting ability. Power conversion efficiency of about 0.32% was observed. This value is about 2.9 times higher than that of pure TiO2 nanotube. The CdS doped TiO2 nanotube composite possesses relatively higher photocatalytic activity and photodegradation efficiency than that of pure TiO2 nanotube under UV light irradiation, and the degradation efficiency of methyl orange was about 42% at UV intensity of 32 W.

Microwave Synthesis and Photocatalytic Activity of Ce4+, Fe3+ Co-Doped TiO2 Nanocomposite

2013 ◽  
Vol 815 ◽  
pp. 523-528
Author(s):  
Wan Qing Xiong ◽  
Quan Xin Zhu ◽  
Jian Lei ◽  
Wen Xiang Ye ◽  
Xue Hong Liao
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Ph Value ◽  
Methyl Orange Solution ◽  
Good Prospect ◽  
Titanium Sulfate ◽  
Doped Titanium Dioxide ◽  
Orange Solution ◽  
Co Doped

In this paper, Ce4+ and Fe3+co-doped titanium dioxide nanocomposite was prepared by iron nitrate, cerium sulfate and titanium sulfate as raw materials and sodium dodecyl sulfate as surfactant under microwave irradiation. The x-ray diffraction (XRD) results show that as-prepared sample of direct adding doped cerium and iron content were 0.2% and 0.5% of titanium sulfate amount of substance calcined at 500°C for 2 h is anatase. We also studied the photocatalytic activity of the as-prepared Fe3+ and Ce4+ co-doped TiO2 nanocomposite by using degradation of methyl orange solution. The effect conditions of photo-catalytic activities of the composite were investigated, such as different ratios of direct adding doped iron and cerium content, different dosage of hydrogen peroxide, different pH value, and different dosage of nanocomposite. When the catalyst is 1.0 g/L, pH value is 4.3, C(H2O2) is 3 mL/L, the effect of the visible light catalytic activity was the best, in 20 min, the degradation rate of 20 mg/L methyl orange solution was more than 90%. Obviously, as-prepared Fe3+ and Ce4+ co-doped titanium dioxide nanocomposite as photocatalysts for degradation methyl orange, has a significant effect. Moreover, the operation was simple, and there was no secondary pollution. In a word, it has a good prospect.

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