Calcination Conditions Influencing the Preparation of Porous TiO2 Film Using PEG1000 as Template

2011 ◽  
Vol 382 ◽  
pp. 340-343
Author(s):  
Wen Jie Zhang ◽  
Bo Yang ◽  
Hong Bo He
Keyword(s):  
Methyl Orange ◽  
Calcination Temperature ◽  
Tio2 Film ◽  
Glass Substrate ◽  
Sol Gel ◽  
Porous Film ◽  
Methyl Orange Degradation ◽  
Degradation Rates ◽  
Sol Gel Process ◽  
Different Temperatures

TiO2 porous film was dip-coated on glass substrate by sol-gel process using PEG1000 as template. The influences of calcination temperature and time were investigated. The absorption edges of the films calcinated at different temperatures have no obvious change, but the transmittances of the films can be affected. Methyl orange degradation rates are 30.1%, 33.8% and 38.3% on the films prepared at 450 oC, 480 oC, and 500 oC, respectively. The film calcinated at 500 oC for 2 h has the highest transmittance and the highest activity on methyl orange degradation, while the films calcinated for less or more than 2 h have much lower activities. After 30 min of irradiation, 38.3% of the initial methyl orange in the solution can be degraded on the porous TiO2 film calcinated at 500 oC for 2 h.

Electro-Assisted Photocatalytic Degradation of Methyl Orange on TiO2 Film Using CaСl2 as Electrolyte

2012 ◽  
Vol 487 ◽  
pp. 635-639
Author(s):  
Wen Jie Zhang ◽  
Hong Liang Xin ◽  
Hong Bo He
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Tio2 Film ◽  
Sol Gel ◽  
Degradation Process ◽  
Applied Potential ◽  
Methyl Orange Degradation ◽  
Degradation Rates ◽  
Smooth Film ◽  
Better Than

Porous and smooth TiO2 film electrodes prepared by sol-gel method were used on methyl orange degradation by an electro-assisted photocatalytic degradation process. Methyl orange cannot be degraded under applied potential solely below 2.0 V. When the applied potential was below 1.3 V, methyl orange degradation rates on porous TiO2 film increased from 5% at 0 V to 65.3% at 1.3 V, and degradation rates on smooth TiO2 film changed from 2.2% at 0 V to 61.1% at 1.3 V. Electro-assisted photocatalytic degradation rate on porous film was better than that on smooth film in the whole electrolyte concentration range. Electro-assisted degradation exhibited the same rising trend along with reaction time on the porous and smooth films.

Co-Sol-Gel Preparation of SiO2-Doped TiO2 on Adsorption and Photocatalytic Degradation of Methyl Orange

2011 ◽  
Vol 48-49 ◽  
pp. 345-348
Author(s):  
Li Li Yang ◽  
Yan Liang Qu ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Irradiation Time ◽  
Sol Gel ◽  
Methyl Orange Degradation ◽  
Doped Tio2 ◽  
Degradation Rates ◽  
Gel Preparation ◽  
Degradation Of Methyl Orange

A co-sol-gel method was used to prepare SiO2-doped TiO2. The amount of ethyl silicate added into the precursor, calcination temperature and time, adsorption equilibrium, and photocatalytic activity of the material were investigated as the factor of degradation efficiency. With the optimum composition of the precursor, the prepared gel calcinated at 500 oC for 3 h showed the highest photocatalytic activity. After 30 min stirring to reach adsorption equilibrium, adsorption contributed less than 2% to the total decoloration of methyl orange on the SiO2-doped TiO2 material. Photocatalytic methyl orange degradation continued with increasing irradiation time. Methyl orange degradation rates after 30 min and 100 min were 31.1% and 96.9%, respectively.

Electro-Assisted Photocatalytic Degradation of Methyl Orange on TiO2 Film Using NaCl as Electrolyte

2012 ◽  
Vol 457-458 ◽  
pp. 1169-1172
Author(s):  
Wen Jie Zhang ◽  
Mei Ling Hu ◽  
Hong Bo He
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Tio2 Film ◽  
Sol Gel ◽  
Porous Electrode ◽  
Degradation Process ◽  
Film Electrode ◽  
Degradation Rates ◽  
Smooth Film ◽  
Degradation Of Methyl Orange

Porous and smooth TiO2 film electrodes prepared by sol-gel method were used on methyl orange degradation by an electro-assisted photocatalytic degradation process. When using the applied potential along, there was no obvious degradation of methyl orange whether using TiO2 film electrode prepared using PEG template or not. The largest difference between the two electrodes appears at potential of 0.7 V in 0.05 mol/l NaCl solution, and the porous electrode shows better degradation activity in electro-assisted photocatalytic degradation. When NaCl concentration was 0.07 mol/l, degradation rates on porous and smooth film electrodes were 51.16% and 32.35 %, respectively. After 100 min of irradiation, 90% of the methyl orange degraded on the porous TiO2 film electrode, and 79.87% of the methyl orange degraded on the smooth TiO2 film electrode.

Porous TiO2 Film Electrode Used for Photoelectrocatalytic Degradation of Methyl Orange in NaHCO3 Solution

2011 ◽  
Vol 230-232 ◽  
pp. 126-130
Author(s):  
Wen Jie Zhang ◽  
Ke Xin Li
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Sol Gel ◽  
Applied Potential ◽  
Methyl Orange Degradation ◽  
Photoelectrocatalytic Degradation ◽  
Degradation Rates ◽  
Negative Effect ◽  
Optimal Values ◽  
Degradation Of Methyl Orange

PEG1000 was used as template to prepare porous TiO2 film by sol-gel method. The functions of applied potential and concentration of NaHCO3 to the photoelectrocatalytic degradation of methyl orange on porous and smooth TiO2 films were investigated. Methyl orange degradation rate has two optimal values at the applied potential of 0.8 V and 1.8 V. The addition of PEG may have negative effect on photoelectrocatalytic activity of TiO2 film. The degradation rate increases with increasing NaHCO3 concentration from 0 up to 0.05 mol/l, and then it declines after further increase of electrolyte concentration. After 100 min of reaction, the degradation rates on the films prepared without and with PEG addition are 63.78% and 65.22%, respectively.

Adsorption Property and Photocatalytic Activity of Sol-Gel Prepared Porous TiO2 Using PEG1000 as Template

2011 ◽  
Vol 48-49 ◽  
pp. 153-156 ◽  
Author(s):  
Chun Ling Liu ◽  
Ru Yuan Li ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Calcination Temperature ◽  
Adsorption Property ◽  
Sol Gel ◽  
Time Range ◽  
Porous Tio2 ◽  
Calcination Temperatures ◽  
Sol Gel Process ◽  
Degradation Activity ◽  
Content Range

PEG1000 was used as a template to prepare porous TiO2 photocatalyst through sol-gel process. The amount of PEG1000 and calcination temperature and time were studied with respect to porous TiO2 activity. At the optimum adding amount of PEG1000, 30.0% of the initial methyl orange was degraded. Methyl orange adsorption on the porous TiO2 maintained less than 2% during the whole template content range. During the calcination temperature range from 400 oC to 600 oC and time range from 2 h to 5 h, the optimum degradation activity appeared to the sample calcinated at 500 oC for 4 h. Adsorption of the materials had no variation at different calcination temperatures and times, and was quite weak compared with degradation efficiencies. 96.2% of the initial methyl orange was degraded after 100 min of irradiation.

TEM and TEM-EDX Analysis of Cross-Section of Anti-Reflective Thin Film and Glass Substrate

2005 ◽  
Vol 475-479 ◽  
pp. 1579-1582
Author(s):  
Xin Gang Yu ◽  
Hong Wen Ma ◽  
Yanbin Zuo ◽  
Hui Feng Zhao ◽  
Wu Wen Luo ◽  
...  
Keyword(s):  
Tio2 Film ◽  
Glass Substrate ◽  
Sol Gel ◽  
Sio2 Film ◽  
Edx Analysis ◽  
Visible Light Range ◽  
Sol Gel Process ◽  
Antireflective Films ◽  
Film Substrate ◽  
Ti Content

Two-layer antireflective films were prepared on Na-Mg-Ca-Si glass substrate by sol-gel process starting from metal alkoxides: Si(OC2H5)4, Ti(OC4H9)4. The transmittance of glass was increased obviously (>95%), the reflective index was reduced to 1.95 through visible light range. TEM observation showed that SiO2 film is compactly joined to TiO2 film and TiO2 film to the substrate. TEM-EDX analysis of the films, film-substrate interface and substrate revealed that with the increase of Ti content, the content of Mg，Ca and Si decreases, however, the content of Na increases. The diffuse of Na+ from the substrate to the film is negative diffusion.

Electro-Assisted Photocatalytic Degradation of Methyl Orange on TiO2 Film Using NH4Cl as Electrolyte

2012 ◽  
Vol 487 ◽  
pp. 640-643
Author(s):  
Wen Jie Zhang ◽  
Fei Fei Bi ◽  
Hong Bo He
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Degradation Process ◽  
Porous Film ◽  
Film Electrode ◽  
Noticeable Effect ◽  
Methyl Orange Degradation ◽  
Smooth Film ◽  
Degradation Of Methyl Orange

Porous and smooth TiO2 film electrodes prepared by sol-gel method were used on methyl orange degradation by an electro-assisted photocatalytic degradation process. The results indicates that methyl orange was barely degraded under the potential alone, availing that potential under 1.8 V had no noticeable effect on removal of the dye. The porous film electrode showed better electro-assisted photocatalytic activity than the smooth film electrode when the potential was above 0.6 V. The porous film showed better activity than the smooth film in nearly all the concentration range except for the highest one. The porous film exhibited better activity than the smooth one.

Effect of Univalent Cations Fluoride in F-Sb Codoped SnO2 Electrode on Electro-Catalytic Degradation of Methyl Orange

2012 ◽  
Vol 465 ◽  
pp. 192-197 ◽  
Author(s):  
Lu Sheng Chen ◽  
Yan Yan Liu ◽  
Huai Xiang Li ◽  
Chao Liu ◽  
Kang Wu
Keyword(s):  
Methyl Orange ◽  
Sol Gel ◽  
Catalytic Degradation ◽  
Anode Surface ◽  
Univalent Cations ◽  
X Ray Diffraction ◽  
Methyl Orange Degradation ◽  
X Ray ◽  
Degradation Rates ◽  
Degradation Of Methyl Orange

In this work, F-Sb codoped SnO2film electrode material has been prepared and used as an anode on titanium (Ti) substrate for degradation of methyl orange. The emphasis is laid on the effect of univalent cations fluoride doped during preparation of F-Sn codoped SnO2composites by sol gel method. The facts show that univalent cations fluoride could affects the electro-catalytic degradation rate of methyl orange by F-Sb codoped composite film on the Ti electrode. A promotion to the degradation rates of methyl orange could be observed when KF or NH4F was used as codopant but other fluoride codopant such as LiF, NaF or HF could slow the methyl orange degradation. X-ray diffraction (XRD) and x-ray photo-electron spectroscopy (XPS) were used to study structures and composition of the anode surface.

Some Influencing Factors on Photocatalytic Activity of TiO2 Film Prepared Using Sol-Gel Method

2012 ◽  
Vol 433-440 ◽  
pp. 362-366 ◽  
Author(s):  
Wen Jie Zhang ◽  
Qian Li ◽  
Wen Bin Liu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Flow Rate ◽  
Glass Substrate ◽  
Uv Light ◽  
Light Exposure ◽  
Air Flow ◽  
Sol Gel ◽  
Air Flow Rate ◽  
Degradation Rates

Subscript text TiO2film was deposited on glass substrate by a sol-gel process. The influences of the SiO2layer, distance between lamp and solution, and air flow rate were investigated. Methyl orange can be hardly degraded under UV light exposure alone. The adsorption rate of methyl orange on TiO2film is negative after 25 min of stirring. Although distance between the lamp and the solution varies from 5.5 cm to 7.5 cm, the degradation rates decline slightly. There is nearly no influence of air flow rate on the entire degradation ability of the photocatalyst. SiO2film coated on microscope glass slide has no photocatalytic activity under UV irradiation. In prior to deposit TiO2film onto the surface of the glass substrate, a SiO2thin layer is coated. The results indicate that the TiO2film with SiO2layer has much better photocatalytic activity that the film without SiO2layer.

Factors Influencing the Preparation of Porous TiO2 Film Using PEG1000 as Template

2011 ◽  
Vol 230-232 ◽  
pp. 59-63
Author(s):  
Wen Jie Zhang ◽  
Jin Lei Chen ◽  
Wen Bin Liu
Keyword(s):  
Photocatalytic Activity ◽  
Glass Substrate ◽  
Degradation Rate ◽  
Sol Gel ◽  
Porous Film ◽  
Factors Influencing ◽  
Water Value ◽  
Sol Gel Process ◽  
Water Amount

TiO2 film was deposited on glass substrate by a sol-gel process using PEG1000 as a template to prepare porous film. The influences of HCl and water amount, layers of the film, and the amount of PEG100 were investigated. The increase of HCl can slightly promote the photocatalytic activity of the film. When n(HCl):n(TEOT) is 0.2:1, the degradation rate is in its maximal value. The optimal water value can be obtained at n(H2O):n(TEOT)=3:1. The photocatalytic activity increases with increasing layer numbers. The five layers film has the highest photocatalytic activity, while the activity declines after further increase of film layers. The photocatalytic activity of theTiO2 film is enhanced with the addition of PEG1000 at first, and then excessive addition of the template leads to activity dropping.

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