Highly porous TiO2/Al2O3 composite nanostructures on glass by anodization and the sol–gel process: fabrication and photocatalytic characteristics

2003 ◽  
Vol 13 (4) ◽  
pp. 866-870 ◽  
Author(s):  
Song-Zhu Chu ◽  
Satoru Inoue ◽  
Kenji Wada ◽  
Di Li ◽  
Hajime Haneda
Keyword(s):  
Sol Gel ◽  
Composite Nanostructures ◽  
Porous Tio2 ◽  
Al2o3 Composite ◽  
Sol Gel Process ◽  
Highly Porous

Highly Porous (TiO2−SiO2−TeO2)/Al2O3/TiO2Composite Nanostructures on Glass with Enhanced Photocatalysis Fabricated by Anodization and Sol−Gel Process

2003 ◽  
Vol 107 (27) ◽  
pp. 6586-6589 ◽  
Author(s):  
Song-Zhu Chu ◽  
Satoru Inoue ◽  
Kenji Wada ◽  
Di Li ◽  
Hajime Haneda ◽  
...  
Keyword(s):  
Sol Gel ◽  
Porous Tio2 ◽  
Sol Gel Process ◽  
Highly Porous

Preparation of ZrO2–Al2O3 composite membranes by sol–gel process and their characterization

2004 ◽  
Vol 367 (1-2) ◽  
pp. 243-247 ◽  
Author(s):  
Yanxia Hao ◽  
Jiansheng Li ◽  
Xujie Yang ◽  
Xin Wang ◽  
Lude Lu
Keyword(s):  
Sol Gel ◽  
Composite Membranes ◽  
Al2o3 Composite ◽  
Sol Gel Process

Porous TiO2-Al2O3 Photocatalyst: The Effects of Calcination Time

2012 ◽  
Vol 496 ◽  
pp. 165-168 ◽  
Author(s):  
Wen Jie Zhang ◽  
Hong Liang Xin
Keyword(s):  
Composite Materials ◽  
Average Pore Size ◽  
Sol Gel ◽  
Specific Area ◽  
Maximum Activity ◽  
Calcination Time ◽  
Average Pore ◽  
Porous Tio2 ◽  
Al2o3 Composite ◽  
Ft Ir

Porous TiO2-Al2O3 composite materials were prepared through sol-gel method after calcination at 500 oC for different time. FT-IR spectra of porous TiO2-Al2O3 composite materials revealed that the samples are composed of Al2O3 and TiO2. The sample calcinated for 2.5 h had the maximum specific area of 128.9 m2•g-1. High pore volume and average pore size were possessed by the samples calcinated for 1 h and 3 h. While being calcinated at 500 oC, photocatalytic activities of the materials increased at first and then dropped down with the increasing calcination time. The sample calcinated for 3 h showed the maximum activity of 35%.

Porous Silica: A Potential Material for Low Dielectric Constant Applications

1998 ◽  
Vol 511 ◽  
Author(s):  
Edward D. Birdsell ◽  
Rosario A. Gerhardt
Keyword(s):  
Spin Coating ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Gelation Time ◽  
Porous Silica ◽  
Low Dielectric Constant ◽  
Low Dielectric ◽  
Sol Gel Process ◽  
Gel Composition ◽  
Highly Porous

ABSTRACTHighly porous (15% dense) silica thin films with k < 2.2 have been produced using a colloidal sol-gel process. This process uses relatively inexpensive, commercially available colloidal silica and potassium silicate. These films were deposited by spin coating. The parameters for spin coating (spin speed, gelation time, gel composition, etc.) have been optimized and coherent films with thicknesses ranging from 0.7–2.0 μm can be reproducibly fabricated. Preliminary work shows that the porosity of these films ranges from a few rn to < 1 μm. The dielectric properties were examined for frequencies up to 1 MHz. Compatibility of the films with IC processing was also investigated.

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.

Catalytic activity of porous TiO2 obtained by sol–gel process in the degradation of phenol

2004 ◽  
Vol 348 ◽  
pp. 185-189 ◽  
Author(s):  
Alysson A.C. Magalhães ◽  
Diego Luiz Nunes ◽  
Patricia A. Robles-Dutenhefner ◽  
Edésia M.B. de Sousa
Keyword(s):  
Catalytic Activity ◽  
Sol Gel ◽  
Porous Tio2 ◽  
Sol Gel Process

scholarly journals A Photocatalytic Active Adsorbent for Gas Cleaning in a Fixed Bed Reactor

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Peter Pucher ◽  
Rabah Azouani ◽  
Andrei Kanaev ◽  
Gernot Krammer
Keyword(s):  
Sol Gel ◽  
Fixed Bed ◽  
Porous Silica ◽  
Active Surface ◽  
Fixed Bed Reactor ◽  
Total Oxidation ◽  
Gas Cleaning ◽  
Silica Substrate ◽  
Sol Gel Process ◽  
Highly Porous

Efficient photocatalysis for gas cleaning purposes requires a large accessible, illuminated active surface in a simple and compact reactor. Conventional concepts use powdered catalysts, which are nontransparent. Hence a uniform distribution of light is difficult to be attained. Our approach is based on a coarse granular, UV-A light transparent, and highly porous adsorbent that can be used in a simple fixed bed reactor. A novel sol-gel process with rapid micro mixing is used to coat a porous silica substrate withTiO2-based nanoparticles. The resulting material posses a high adsorption capacity and a photocatalytic activity under UV-A illumination (PCAA = photocatalytic active adsorbent). Its photocatalytic performance was studied on the oxidation of trichloroethylene (TCE) in a fixed bed reactor setup in continuous and discontinuous operation modes. Continuous operation resulted in a higher conversion rate due to less slip while discontinuous operation is superior for a total oxidation toCO2due to a user-defined longer residence time.

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