Hydrophilic and Photocatalytic Performances of Y-Doped Titanium Dioxide Thin Films

2013 ◽  
Vol 651 ◽  
pp. 103-108
Author(s):  
Jun Du ◽  
Yan Bin Yu ◽  
Jing Jing Huang ◽  
Hua Qiang Fu ◽  
Bu Hui Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Contact Angle ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Crystalline Phase ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Continuous Increase ◽  
Photocatalytic Performances

Pure and Y-doped TiO2 thin films are prepared on glass by sol-gel method. Tetrabutyl titanate was used as Ti precursors. The chemical composition, structure and properties of TiO2 thin films are characterized by XRD, FT-IR, UV-Vis and Optical Contact Angle Measuring Instrument. Their photocatalytic performances were studied in detail by the methylene blue degradation model. The results show that the crystalline phase of Y2Ti2O7 is formed and the phase transformation from anatase to rutile is restrained when Y is doped in the TiO2 thin films. However, with the continuous increase in calcination temperature, its photocatalytic activity decreases, because the anatase will transform to the rutile. The proper amount of Y doping will cause the lattice to expand, the new defects will form and the smaller band-gap energy will be revealed. Thus, the absorption ability toward the ultraviolet can be improved, the redshift of the absorption band can also be found. As the results of it, the hydrophilicity and photocatalytic efficiency can improved. Furthermore, the photocatalytic activity increases with the hydrophilicity. When the calcination temperature of thin films is 450oC and the Y-doping is 0.3%, the main crystalline phase of the samples is the anatase, the contact angle is only 13.7o and the degradation ratio of methylene blue reached 98.84%.

Preparation, Characterization and Photocatalytic Properties of Cu, P-codoped TiO2 Nanoparticles

2011 ◽  
Vol 239-242 ◽  
pp. 2562-2565 ◽  
Author(s):  
Mei Ru Xu ◽  
Gang Ni ◽  
Fang Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Calcination Temperature ◽  
Crystalline Phase ◽  
Anatase Phase ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Tem Analysis ◽  
Gel Method ◽  
Phase Transform

A novel copper and phosphorus codoped TiO2 photocatalyst was synthesized by modified sol–gel method using tetrabutyl titanate, Cu(NO3)2 and H3PO4 as precursors. The samples were characterized by XRD, TEM, TGA, EDX. The TGA indicated the calcination temperature is 450°C. The XRD results showed undoped and Cu, P-codoped TiO2 nanoparticles only include anatase phase, and the temperture of crystalline phase transform for Cu, P codeped TiO2 had changed compared with undoped. The TEM analysis revealed the doping of Cu and P suppressed the growth of TiO2 grains. The photocatalytic activity of samples was tested for degradation of 20 mg·L−1 methyl orange (MO) solutions. The results showed photocatalytic activity of the catalysts with 0.5% Cu, 0.375% P-codoped TiO2 was higher than pure TiO2 under ultraviolet (UV).

Photocatalytic Degradation of Methylene Blue by NiO Thin Films under Solar Light Irradiation

2019 ◽  
Vol 56 ◽  
pp. 152-157 ◽  
Author(s):  
Abdelouahab Noua ◽  
Hichem Farh ◽  
Rebai Guemini ◽  
Oussama Zaoui ◽  
Tarek Diab Ounis ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Light Irradiation ◽  
Solar Light ◽  
Solar Light Irradiation

Nickel oxide (NiO) thin films were successfully deposited by sol-gel dip-coating method on glass substrates. The structural, morphological and optical properties in addition to the photocatalytic activity of the prepared films were investigated. The results show that the films have a polycrystalline NiO cubic structure with dense NiO grains and average optical transmittance in the visible region. The photocatalytic properties of the films were studied through the degradation of methylene blue and 89% of degradation was achieved for 4.5h of solar light irradiation exposure which indicates the capability of NiO photocatalytic activity.

Effect of SnO2 Addition into TiO2 Thin Films on Photocatalytic Activity and Hydrophilic Property

2014 ◽  
Vol 979 ◽  
pp. 90-93 ◽  
Author(s):  
Weerachai Sangchay ◽  
Tanarat Rattanakool
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Sol Gel ◽  
Dip Coating ◽  
Photocatalytic Activities ◽  
Self Cleaning ◽  
Xrd Techniques ◽  
Dip Coating Technique

The pure TiO2and SnO2-TiO2thin films on glass substrate were fabricated using a sol-gel dip coating technique. The thin films were annealed at the temperature of 700 °C for 2 h with the heating rate of 10 °C/min. The microstructures of the fabricated thin films were characterized by SEM and XRD techniques. The photocatalytic activities of the thin films were also tested by the degradation of methylene blue (MB) solution under UV irradiation. Finally, hydrophilic or self-cleaning properties of thin films were evaluated by measuring the contact angle of water droplet on the thin films with and without UV irradiation. It was found that 1 %mol SnO2-TiO2thin films shows the highest of photocatalytic activity and provide the most self-cleaning properties.

Preparation of Mesoporous Magnetic TiO2/CoFe2O4 Photocatalysts Using Ionic Liquid as Template Agent

2013 ◽  
Vol 345 ◽  
pp. 201-204 ◽  
Author(s):  
Kai Wang ◽  
Lan Bo Di ◽  
Li Juan Zhang ◽  
Gui Fu Dong ◽  
Xiu Ling Zhang
Keyword(s):  
Phase Transition ◽  
Methylene Blue ◽  
Ionic Liquid ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bet Analysis

A simple sol-gel method using 1-butyl-3-methylimidazoliun tetrafluoroborate ([C4MIM]BF4) ionic liquid as template agent was used to prepared mesoporous magnetic TiO2/CoFe2O4photocatalysts (denoted as IL-TiO2/CoFe2O4). The photocatalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis. The results showed that well crystallized anatase TiO2in IL-TiO2/CoFe2O4photocatalysts could be obtained when the calcination temperature was as low as 200 °C, and the phase transition temperature from anatase to rutile was increased to 800 °C. BET analysis showed that IL-TiO2/CoFe2O4was mesoporous structure. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methylene blue (MB). The results showed that photocatalytic activity of IL-TiO2/CoFe2O4was 6 times higher than that of TiO2/CoFe2O4when a low calcination temperature of 350 °C was used.

Synthesis of Ag/ZnO Nanocomposite with Excellent Photocatalytic Performance via a Facile Sol-Gel Method

2014 ◽  
Vol 875-877 ◽  
pp. 251-256 ◽  
Author(s):  
Lin Sun ◽  
Rong Shao ◽  
Lan Qin Tang ◽  
Zhi Dong Chen
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

Ag/ZnO nanocomposite photocatalysts with high photocatalytic performance were successfully synthesized via a facile sol-gel method. The prepared Ag/ZnO products were characterized by XRD, SEM, EDS, FT-IR, BET surface area, TG and DSC. Photodegradation experiments of the samples were carried out by choosing Methylene Blue (MB) as a model target under UV irradiation with homemade photocatalytic apparatus. Among these products, when the molar ratio of Ag to ZnO was fixed at 0.07 and the calcination temperature was around 450 °C, the obtained samples exhibited the highest photocatalytic activity.

The Synthesis of Ag Doped TiO2 Powders and Enhanced Photocatalytic Activity for Degradation of Organic Dye in Waste Waters

2013 ◽  
Vol 650 ◽  
pp. 3-6 ◽  
Author(s):  
Li Ming Jiang
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Calcination Temperature ◽  
Rhodamine B ◽  
Sol Gel ◽  
Organic Dye ◽  
Tetrabutyl Titanate ◽  
Waste Waters ◽  
Calcination Time ◽  
Electron Hole

The Ag/TiO2powders with different Ag contents were synthesized with tetrabutyl titanate as a titanium source and silver nitrate as silver source by sol-gel method, and the Ag contents in the Ag/TiO2powders were 0.1%, 0.3%, 0.5 %, 0.8%, 1%, 1.5%, 2%, 2.5%, 3%, and 4% (mole ratio) respectively. Meanwhile, Rhodamine B was used as target degradant to value the photocatalytic activity of Ag/TiO2powders, the effects of Ag contents, the calcination temperature and calcination time on the photocatalytic activity were disscussed The results show that catalytic activity of the Ag/TiO2powders prepared with the Ag content of 2%, calcination temperature of 450 °C and calcination time of 2 hours exhibited the best photocatalytic activity, which was ascribed to the abundant electron traps in favor of the separation of the photoinduced electron-hole pairs.

Preparation and Photocatalytic Activity of Nd3+and CTAB Co-Doped Nanometer TiO2 Thin Films

2013 ◽  
Vol 562-565 ◽  
pp. 858-863
Author(s):  
Lan Fang Yao ◽  
Xiong Tang ◽  
Xin Pei Yan ◽  
Lin Li
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Cetyltrimethylammonium Bromide ◽  
Raw Materials ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
X Ray Diffraction ◽  
Gel Technique ◽  
Uv Visible ◽  
Co Doped

Pure TiO2, Nd3+doped TiO2 and Nd 3+-CTAB co-doped TiO2 nanometer thin films were prepared by the sol-gel technique with tetrabutyl titanate and neodymium nitrate as raw materials and surfactant cetyltrimethylammonium bromide (CTAB) as template. The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Visible absorbance spectroscopy (UV-Vis). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange. The results show that the all samples calcined at 500°C are all anatase, and there are slight red shifts of the Nd3+doped TiO2 and Nd3+-CTAB co-doped TiO2 films compared with pure TiO2 films and the red shift of Nd 3+-CTAB co-doped TiO2 is more obvious than that of Nd 3+ doped TiO2, which is beneficial to improve the photocatalytic efficiency. The1.0% Nd3+-CTAB co-doped TiO2 nanometer film calcined at 500°C had excellent photocatalytic efficiencies and the degradation rate of the film is more than 90% after 120 min.

Preparation and Properties of Photocalysts in ZnO/TiO2 System

2019 ◽  
Vol 800 ◽  
pp. 170-174
Author(s):  
Jānis Grabis ◽  
Anita Letlena ◽  
Inta Sīpola
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Solar Light ◽  
Methylene Blue Solution ◽  
Titanium Butoxide ◽  
Blue Solution

ZnO/TiO2 nanocomposites with several ratio of the components were prepared by sol-gel method using titanium isopropoxide and titanium butoxide as titania precursors. Phase formation and photocatalytic activity of ZnO/TiO2 nanocomposites depend on ratio of the components and calcination temperature. The photocatalytic activity in dependence on calcination temperasture, phase composition was determined by degradation of methylene blue solution under Hg lamp and solar light imitating illumination. The highest photocatalytic activity showed ZnO/TiO2 nanocomposites containing 99 mol.% ZnO and 50 mol% ZnO when hexagonal ZnTiO3 phase was formed. ZnO/TiO2 nanocomposites exhibited enhanced photoactivity under solar light with respect to Hg lamp irradiation.

scholarly journals Mesoporous MgTa2O6 thin films with enhanced photocatalytic activity: On the interplay between crystallinity and mesostructure

2012 ◽  
Vol 3 ◽  
pp. 123-133 ◽  
Author(s):  
Jin-Ming Wu ◽  
Igor Djerdj ◽  
Till von Graberg ◽  
Bernd M Smarsly
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Self Assembly ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
Ordered Mesoporous ◽  
Mesoporous Film ◽  
Evaporation Induced Self Assembly ◽  
Poly Ethylene

Ordered mesoporous, crystalline MgTa2O6 thin films with a mesoscopic nanoarchitecture were synthesized by evaporation-induced self-assembly (EISA) in combination with a sol–gel procedure. Utilization of novel templates, namely the block copolymers KLE (poly(ethylene-co-butylene)-b-poly(ethylene oxide)) and PIB6000 (CH3C(CH3)2(CH2C(CH3)2)107CH2C(CH3)2C6H4O(CH2CH2O)100H), was the key to achieving a stable ordered mesoporous structure even upon crystallization of MgTa2O6 within the mesopore walls. The effect of the calcination temperature on the ability of the mesoporous films to assist the photodegradation of rhodamine B in water was studied. As a result, two maxima in the photocatalytic activity were identified in the calcination temperature range of 550–850 °C, peaking at 700 °C and 790 °C, and the origin of this was investigated by using temperature-dependent X-ray scattering. Optimal activity was obtained when the mesoporous film was heated to 790 °C; at this temperature, crystallinity was significantly high, with MgTa2O6 nanocrystals of 1.6 nm in size (averaged over all reflections), and an ordered mesoporous structure was maintained. When considering the turnover frequency of such photocatalysts, the optimized activity of the present nanoarchitectured MgTa2O6 thin film was ca. four times that of analogous anatase TiO2 films with ordered mesopores. Our study demonstrated that high crystallinity and well-developed mesoporosity have to be achieved in order to optimize the physicochemical performance of mesoporous metal-oxide films.

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