PEG and ODA as Composite Templates to Prepare Porous TiO2 Films by Sol-Gel Method

2011 ◽  
Vol 63-64 ◽  
pp. 698-701 ◽  
Author(s):  
Wen Jie Zhang ◽  
Jia Wei Bai
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Wavelength Region ◽  
Sharp Decrease ◽  
Dip Coating ◽  
Porous Structures ◽  
Glass Substrates ◽  
Uv Light Irradiation

Porous TiO2 films were prepared through dip-coating on glass substrates using composite templates of PEG and ODA. Photocatalytic activity of the photocatalyst was evaluated by measuring removal rate of aqueous methyl orange under UV light irradiation. The addition of composite templates had obvious influence on surface morphology of the films. Layered and porous structures formed in the surface due to the function of templates. When the amount of PEG in the composite template increased from 0.1 g to 1.9 g, adsorption edge of the films moved to longer wavelength region. When the amount of PEG increased to 1.0 g, there were sharp decrease of specific surface area and cumulative pore volume. The improving photocatalytic activity as a result of addition of PEG can be noticed.

scholarly journals Preparation of TiO2/Activated Carbon Composites for Photocatalytic Degradation of RhB under UV Light Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Baolin Xing ◽  
Changliang Shi ◽  
Chuanxiang Zhang ◽  
Guiyun Yi ◽  
Lunjian Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Electron Microscope ◽  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Light Irradiation ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Loading Amount

Photocatalysts comprising nanosized TiO2particles on activated carbon (AC) were prepared by a sol-gel method. The TiO2/AC composites were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, nitrogen adsorption, scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray (EDX). Their photocatalytic activities were studied through the degradation of Rhodamine B (RhB) in photocatalytic reactor at room temperature under ultraviolet (UV) light irradiation and the effect of loading cycles of TiO2on the structural properties and photocatalytic activity of TiO2/AC composites was also investigated. The results indicate that the anatase TiO2particles with a crystal size of 10–20 nm can be deposited homogeneously on the AC surface under calcination at 500°C. The loading cycle plays an important role in controlling the loading amount of TiO2and morphological structure and photocatalytic activity of TiO2/AC composites. The porosity parameters of these composite photocatalysts such as specific surface area and total pore volume decrease whereas the loading amount of TiO2increases. The TiO2/AC composite synthesized at 2 loading cycles exhibits a high photocatalytic activity in terms of the loading amount of TiO2and as high as 93.2% removal rate for RhB from the 400 mL solution at initial concentration of 2 × 10−5 mol/L under UV light irradiation.

Effect of Calcination Temperature on the Photocatalytic Activity of Porous TiO2 Film

2010 ◽  
Vol 658 ◽  
pp. 495-498
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Tio2 Film ◽  
Uv Light ◽  
Dip Coating ◽  
Light Irradiation ◽  
Porous Tio2 ◽  
Glass Substrates ◽  
Uv Light Irradiation ◽  
Coating Method

To obtain porous TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating method on quartz glass substrates using this sol. The TiO2 films were calcined at 500-900 °C. The photocatalytic activities of the films were evaluated by examining decomposition of methylene blue in aqueous solution under UV light irradiation. The photocatalytic activity of the porous TiO2 film showed a different tendency according to the irradiation wavelength of UV light. The activity of the film evaluated under UV light irradiation with a wavelength of 254 nm was not affected a great deal by the clacination temperature. In the case of UV light irradiation with a wavelength of 365 nm, the activity of the film increased with increasing calcination temperature and that of the film calcined at 800 °C was the highest.

scholarly journals Sol-Gel Synthesis of TiO2/SiO2 and ZnO/SiO2 Composite Films and Evaluation of Their Photocatalytic Activity towards Methyl Green

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
V. L. Chandraboss ◽  
B. Karthikeyan ◽  
J. Kamalakkannan ◽  
S. Prabha ◽  
S. Senthilvelan
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Composite Films ◽  
Dip Coating ◽  
Methyl Green ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Coating Method ◽  
Dip Coating Method

The TiO2/SiO2 and ZnO/SiO2 composite films were prepared by sol-gel dip coating method. The surface morphology and crystal structure of thin films were characterized by means of scanning electron microscopy (SEM) with elementary dispersive X-ray analysis (EDX) and X-ray diffractometer (XRD). Optical properties of films have been investigated using ultraviolet and visible spectroscopy (UV-visible spectroscopy). The photocatalytic activity was established by testing the degradation and decolorization of methyl green (MG) from aqueous solution with artificial UV-light.

scholarly journals Development of Photocatalytic Ceramic Materials through the Deposition of TiO2 Nanoparticles Layers

2012 ◽  
Vol 18-19 ◽  
pp. 165-176 ◽  
Author(s):  
J.O. Carneiro ◽  
V. Teixeira ◽  
S. Azevedo ◽  
F. Fernandes ◽  
J. Neves
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Porous Ceramic ◽  
Sol Gel ◽  
Research Work ◽  
Construction Materials ◽  
Dip Coating ◽  
Human Beings ◽  
Ceramic Surfaces ◽  
Self Cleaning

Urbanism and communities centralization enlarges atmospheric pollution that affects both human beings as well as their constructed buildings. Different scientific and technological studies are being conducted, both in academic and construction industry, aiming the development of new construction materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings required. The present research work aims the study and the production of self-cleaning ceramic surfaces in an economical and viable way without changing aesthetical aspect of material substrates used. The use of TiO2 nanoparticles (TiO2-NNPs) represents an attractive way to generate self-cleaning surfaces, therefore promoting the degradation of pollutant agents and reducing cleaning maintenance costs. In order to impart self-cleaning properties to ceramic surfaces, TiO2-NNPs based layers were deposited on different ceramic material substrates using the dip-coating method. The Photocatalytic activity (degradation of pollutants adsorbed on the surface) of the TiO2-NNPs based layers was characterized via the decomposition rate of an aqueous solution of Methylene blue (MB) under UV light irradiation. Colourless layers were successfully produced onto gray and white ceramic substrates using this sol-gel technique, without changing their aesthetical appearance. It was observed that the best photocatalytic activity was exhibited by the most porous ceramic substrate (gray); nevertheless, all the TiO2-NNPs coated ceramic surfaces showed good photocatalytic efficiency.

scholarly journals Preparation and Photocatalytic Activity of TiO2/Fine Char for Removal of Rhodamine B

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mingjie Ma ◽  
Weijie Guo ◽  
Zhengpeng Yang ◽  
Shanxiu Huang ◽  
Guanyu Wang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Uv Light ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation

TiO2/fine char (FC) photocatalyst was prepared via sol-gel method with tetrabutyl titanate as the precursor and FC as the carrier. The structural property of TiO2/FC photocatalyst was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the photocatalytic activity of TiO2/FC was evaluated by photocatalytic degradation of rhodamine B (RhB) aqueous solution under UV light irradiation. The results showed that TiO2was successfully coated on the surface of FC, and the TiO2/FC photocatalyst had better photocatalytic efficiency and stability for degradation of RhB under UV light illumination as compared to that of the pure TiO2and FC. The study provided a novel way for the application of FC to the photocatalytic degradation of organic wastes.

Effect of Fe Incorporation on the Photocatalytic Activity of TiO2 by Sol-Gel Method

2015 ◽  
Vol 1087 ◽  
pp. 218-222
Author(s):  
Siti Aida Ibrahim ◽  
Srimala Sreekantan
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Combination Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Vis Spectroscopy ◽  
Visible Irradiation ◽  
Emission Microscopy

Nanostructured Fe-TiO2 and TiO2 with anatase structure were synthesized via combination method of sol-gel and peptization process. The samples were characterized by X-ray diffraction (XRD), Transmission emission microscopy (TEM) and UV-Vis spectroscopy (UV-Vis). The presence of Fe3+ ion shifted the absorption profile of TiO2 to the longer wavelength side of the spectrum, indicating an obvious photocatalytic activity under visible irradiation. Photocatalytic activity of the samples were evaluated by methyl orange (MO) discolouration under UV-light irradiation. Compared with the pure TiO2 nanoparticles, the Fe-TiO2 nanoparticles exhibited higher photocatalytic activity with 95% discoloration within 2 h.

Photocatalytic Activity of Porous TiO2 Film Prepared by Dip-Coating Technique Using Sol Containing Trehalose

2009 ◽  
Vol 620-622 ◽  
pp. 691-694 ◽  
Author(s):  
Takeshi Miki ◽  
Kaori Nishizawa ◽  
Eiji Watanabe ◽  
Hiroshi Taoda
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Film ◽  
Uv Light ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Technique ◽  
Glass Substrates ◽  
Trehalose Dihydrate ◽  
Dip Coating Technique ◽  
Hydrolysis Of

To obtain porous and thick TiO2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO2 film was fabricated by dip-coating technique on quartz glass substrates using this sol. The TiO2 films were calcined at 500-700 °C. The photocatalytic activity of the films was evaluated by examining decomposition of methylene blue in aqueous solution under UV light irradiation. The TiO2 film prepared from the sol with trehalose was more active than TiO2 film prepared from the sol without trehalose. The trehalose addition to the dip-coating solution was effective in improving the photocatalytic activity of the TiO2 film.

Synthesis of Composite TiO2/Natural Cotton Cellulose Nanofiber with Photocatalytic Property

2014 ◽  
Vol 665 ◽  
pp. 393-396
Author(s):  
Qiu Yan Liu ◽  
Jing Li ◽  
Jun Cao ◽  
Chao Rong Li
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Important Application ◽  
Anatase Structure ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Hydrothermal Methods

TiO2/NCCN nanocomposites have been prepared by sol-gel and hydrothermal methods. Firstly, the NCCN was prepared by electrospinning technology, then the amorphous TiO2films were coated on the surface of the NCCN by a sol-gel method, and TiO2(anatase structure) nanoparticles could be fixed on the surface of NCCN by a hydrothermal method to get higher photocatalysis efficiency. The photocatalytic activities indicate that the TiO2/NCCN nanocomposites exhibited a good photocatalytic activity for photodegradation of methylthionine chloride (MO) solution under UV light irradiation, leading to an important application in photodegradation of organic pollutant.

scholarly journals Preparation of TiO2@ZIF-8 for the removal of As(III) in water

2017 ◽  
Vol 17 (6) ◽  
pp. 1730-1739 ◽  
Author(s):  
Guangpeng Li ◽  
Hui Jiang ◽  
Dan Li ◽  
Tianyu Liao ◽  
Lingling Yuan ◽  
...  
Keyword(s):  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Illumination Condition ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Uv Light Irradiation ◽  
The Matrix ◽  
Ft Ir ◽  
The Stability

Abstract To remove As(III) in water, the composite material of TiO2@ZIF-8 was prepared by a sol-gel method with zeolitic imidazolate framework-8 (ZIF-8) as the matrix. The structure of TiO2@ZIF-8 was characterized with scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The results indicated that the best loading efficiency of TiO2 on ZIF-8 occurred when it was calcined at 300 °C for 3 h. This material was used to remove As(III) from aqueous solution, and the effect of the initial concentration of As(III), pH, and the illumination condition on the removal of As(III) was investigated. The results showed that the removal rate of As(III) was as high as 100% under a pH of 4–7, an initial As(III) concentration of less than 2 mg/L, and UV-light irradiation for 2 h. The repeated experiments were also performed for the investigation of the stability of TiO2@ZIF-8.

scholarly journals Effect of titanium source and sol-gel TiO2 thin film formation parameters on its morphology and photocatalytic activity

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Piotr Dulian ◽  
Jan Zajic ◽  
Witold Żukowski
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Surface Structure ◽  
Uv Light ◽  
Film Formation ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Dip Coating ◽  
Single Step ◽  
Titanium Butoxide

AbstractTiO2 thin films with different surface structure have been prepared from alkoxide solutions by the sol-gel method using different cationic precursors and heat treatment techniques. The effect of using titanium isopropoxide as well as titanium butoxide as a titanium source on the surface structure and photocatalytic activity of the resultant thin films was studied. Significant differences in the rate of hydrolysis and condensation reactions during the sol-gel synthesis were observed for these titanium precursors. This had a direct influence on the morphology of the as-prepared TiO2 films. Higher quality oxide coatings were obtained from titanium isopropoxide. They were characterized by a smaller grain size, improved surface roughness and uniform coverage of the glass substrate. A beneficial effect of calcination process after each sol application cycle in contrast to single step calcination after all dip-coating cycles was observed. Photocatalytic degradation tests showed that methyl orange was decolorized in the presence of all prepared TiO2 films by exposing their aqueous solutions to UV light (λ = 254 nm). The highest photocatalytic activity had the TiO2 layer produced using titanium isopropoxide.

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