Synthesis with Microwave-Assisted Sol-Gel Method and Photocatalytic Activity of Quantum-Sized TiO2 under Solar and Ultraviolet Irradiation

2011 ◽  
Vol 399-401 ◽  
pp. 666-672
Author(s):  
Shi Xiang Lu ◽  
Lian Dai ◽  
Wen Guo Xu ◽  
Cheng Xiang Ma
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Degradation Rate ◽  
Sol Gel ◽  
Raw Material ◽  
Solar Irradiation ◽  
Processing Temperature ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted

Quantum-sized TiO2 had been prepared by using Ti(n-OC4H9)4 as the raw material via a microwave-assisted sol-gel method. The influence of different processing temperature and time on the size of TiO2 was researched. The TiO2 was characterized by transmission electron microscopy (TEM) and X-ray diffraction analysis (XRD). The prepared TiO2 presents anatase phase structure by TEM and XRD. The photocatalytic activity of TiO2 was evaluated by the degradation rate of methyl orange in aqueous solution. The particle size of TiO2 was about 9.10 nm when the processing temperature was 160°C and the processing time was 90 min (160°C-90min), and the photocatalytic performance was the best under this size. When the initial concentration of methyl orange was 10 mg/L and the amount of quantum-sized TiO2 was 0.6 g/L, the degradation rate of methyl orange under ultraviolet and solar irradiation at room temperature in 60 min were 40% and 86%, respectively.

Preparation of Zno-Cr2O3 Composites by a Sol-Gel Method and their Photocatalytic Activities

2012 ◽  
Vol 151 ◽  
pp. 365-367 ◽  
Author(s):  
Kai Yuan Gu ◽  
Zhan En Peng ◽  
Jin Hua Feng ◽  
Feng Qiang Sun
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Sol Gel ◽  
Mercury Lamp ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Activities ◽  
Degradation Of Methyl Orange

The ZnO-Cr2O3 composites with different complex proportion were prepared by a sol-gel method. The mol ratio of Zn and Cr element could be tuned by controlling the concentration of the precursors. These composites showed photocatalytic activities in degradation of methyl orange under the irradiation of 300W mercury lamp. And the activities regularly varied with the mol ratio of Zn and Cr. When n（Zn）:n（Cr）=10:1, a composite with best photocatalytic activity could be obtained.

Porous B-TiO2 Prepared by Sol-Gel Method Using Boric Acid as Boron Source

2012 ◽  
Vol 496 ◽  
pp. 146-149
Author(s):  
Yu Feng Sun ◽  
Ke Xin Li ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Degradation Rate ◽  
Sol Gel ◽  
Slight Variation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ctab Concentration ◽  
Boron Doped ◽  
Optimal Value ◽  
Boron Source

Three kinds of templates were used to prepare porous boron doped TiO2 based photocatalysts by sol-gel method. Adsorption of methyl orange on the materials maintained with very slight variation in template adding concentration. With increasing PEG1000 concentration, photocatalytic activity of the material presented obviously variation. The optimal concentration appeared at 0.08 mol/l, where methyl orange degradation rate was 24.7%. When PEG400 concentration was 0.14 mol/l, photocatalytic degradation rate of methyl orange on the material was 17.9%. In the template concentration range from 0.06 mol/l to 0.16 mol/l, degradation activity occurred at CTAB concentration of 0.10 mol/l showed the optimal value of 31.1%, which was the highest among the three kinds of templates.

Photocatalytic Activity of TiO2 Loaded on HZSM-5 Zeolite Modified by Ammonia Phosphate

2011 ◽  
Vol 214 ◽  
pp. 6-10
Author(s):  
Wen Jie Zhang ◽  
Ke Xin Li ◽  
Yang Yu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Gel Method ◽  
Sol Gel Method ◽  
Orange Solution ◽  
Decoloration Rate

The ammonia phosphate treated HZSM-5 zeolite was used as support for TiO2 prepared by sol-gel method. Adsorption and photocatalytic activity of the zeolite, adsorption of the loaded TiO2, and the optimum TiO2 loading percentage were studied. The zeolite can concentrate methyl orange solution after adsorbing water and possesses no obvious photocatalytic activity. The solution reached its adsorption equilibrium after 20 min when using TiO2 loaded on HZSM-5. In the TiO2 loading range from 10% to 70%, the dye decoloration rate increased constantly from 20% to 36.2%. The activity of the TiO2 was enhanced after loading with the optimum loading percent of 70%. During the whole 180 min of irradiation, TiO2/HZSM-5 showed enhanced methyl orange decoloration activity.

Microwave-Assisted Synthesis and Photocatalytic Activity of Quantum-Sized ZnO

2011 ◽  
Vol 284-286 ◽  
pp. 866-870 ◽  
Author(s):  
Wen Guo Xu ◽  
Cheng Xiang Ma ◽  
Shi Xiang Lu ◽  
Lian Dai ◽  
Hai Feng Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Sol Gel ◽  
Heating Time ◽  
Raw Material ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Lithium Hydroxide Monohydrate ◽  
Hydroxide Monohydrate ◽  
Reactive Blue 4

ZnO was prepared using zinc acetate dehydrate (Zn(CH3COO)2·2H2O) and lithium hydroxide monohydrate (LiOH·H2O) as raw material through a microwave-assisted sol-gel method. The prepared ZnO presents the wurtzite structure. The influence of different reaction temperature and heating time to the size of ZnO was researched. The photocatalytic activity of ZnO was evaluated by the degradation rate of C.I. Reactive Blue 4 in aqueous solution. The particle size of ZnO is about 4.33 nm at the reaction condition of 50°C for 10 min and the photocatalytic performance is the best. The degradation rate of C.I. Reactive Blue 4 could exceed 75% in 30 min at room temperature when the initial concentration of C.I. Reactive Blue 4 was 40 mg/L and the concentration of the quantum-sized ZnO was 0.1 g/L.

Synthesis and Photocatalytic Activity of Ag Doped TiO2 Nanofibers

2018 ◽  
Vol 913 ◽  
pp. 1027-1032 ◽  
Author(s):  
Hong Ying Dong ◽  
Qing Hong Sun ◽  
Ting Ting Zhang ◽  
Qi Ren ◽  
Wen Ma
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Sol Gel ◽  
Experimental Results ◽  
Small Particles ◽  
Gel Method ◽  
Sol Gel Method ◽  
Uv Visible ◽  
20 Nm

Ag/TiO2nanofibers were obtained by sol-gel method combined with uniaxial electrospinning. The effects of different sintering temperatures (400°C, 500°C, 600°C) and different concentrations of silver (0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt%) on photocatalytic activity of TiO2were investigated. The morphology and interface interaction of the Ag/TiO2composites were investigated by SEM, TEM, XRD and UV-visible spectrophotometer. The experimental results showed that the diameter of the fiber sintered at 400°C is about 120 nm and the fiber is composed of 10-20 nm small particles. The degradation rate of methylene blue was 71% for the Ag/TiO2composites fiber with 1.0wt% silver and sintered at 400°C.

Solar Photocatalytic Degradation of 2,4-Dichlorophenol by TiO2 Nanoparticle Prepared by Sol-Gel Method

2011 ◽  
Vol 233-235 ◽  
pp. 3032-3035 ◽  
Author(s):  
Mohd S. Takriff ◽  
Muneer M. Ba-Abbad ◽  
Abdul Amir H. Kadhum ◽  
Abu Bakar Mohamad ◽  
Kamaruzzaman Sopian
Keyword(s):  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Ultra Violet ◽  
Raw Material ◽  
Solar Irradiation ◽  
Time Intervals ◽  
Gel Method ◽  
Sol Gel Method ◽  
Titanium Tetra Isopropoxide ◽  
Solar Intensity

The solar photocatalytic degradation of 2,4-dicholrophenol in aqueous solution was carried out direct solar radiation without any collector. A slurry reactor with TiO2 nanoparticles catalyst was used. The catalyst sample was prepared by sol-gel method from titanium tetra-isopropoxide as raw material and calcinated at 400°C. The photocatalytic activity of TiO2 nanoparticles were evaluated by photocatalytic degradation of initial concentration (50 mgl-1) 2,4-dicholrophenol under solar irradiation. The average solar intensity of ultra violet (UV) was recorded as 23 Wm-2. HPLC was used for monitoring the concentration of 2,4-dicholrophenol in solution at different time intervals during the experiment. The degradation efficiency of 2,4-dicholrophenol removal was 93.8% at pH solution of 6, irradiated for 1 h and using optimum amount of catalyst 2gl-1 .

Green Synthesis of Cobalt Oxide Nanoparticles by a Starch-Assisted Method

2019 ◽  
Vol 9 (3) ◽  
pp. 362-370 ◽  
Author(s):  
D. Vaya ◽  
Meena ◽  
B.K. Das
Keyword(s):  
Photocatalytic Activity ◽  
Cobalt Oxide ◽  
Sol Gel ◽  
Complex Nature ◽  
Oxide Nanoparticles ◽  
Capping Agent ◽  
Chemical Route ◽  
Gel Method ◽  
Sol Gel Method ◽  
Cobalt Oxide Nanoparticles

Background: The properties of the material are altered when material size shifted towards nano-regime. This feature could be used for wastewater treatment process using model pollutant such as dyes. Recently, nanoparticles are synthesized by a green chemical route using different capping agents. This is the reason we adopt starch as green capping agent along with sol-gel method. Objective: To synthesize cobalt oxide nanoparticles by green chemical route and utilized it in degradation of dyes. Methods: Synthesis of cobalt oxide nanoparticles by sol-gel method using starch as a capping agent. The characteristics of surface modifications were investigated by UV-VIS, TEM, SEM, XRD and FTIR techniques. Results: Cobalt oxide nanoparticles synthesized and inhibited photocatalytic activity. Conclusion: Deactivation of photocatalytic activity due to complex nature of starch. This property can be used elsewhere as in light shielding applications to coat and protect surfaces in order to keep them cool and safe from damage as in the painting of vehicles, roofs, buildings, water tanks, etc.

Study on the Influence Factors of ZnFe2O4 and TiO2 Composite Films Photoelectrocatalytic Properties

2011 ◽  
Vol 287-290 ◽  
pp. 2199-2202
Author(s):  
Gui Qin Hou ◽  
Wen Li Zhang ◽  
Shui Jing Gao ◽  
Xiao Yan Wang
Keyword(s):  
Methyl Orange ◽  
Sol Gel ◽  
Composite Films ◽  
Influence Factors ◽  
Nanocomposite Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Conductive Glass ◽  
Photocatalytic Activities ◽  
Film Layer

The ZnFe2O4 and TiO2 nanocomposite films was prepared by Sol-Gel method on conductive glass, and the influence factors of it’s photoelectrocatalytic performence such as the film layer, pole and voltage was investigated. The results indicated that: the photocatalytic effects of composite films with ZnFe2O4+ TiO2+ ZnFe2O4 was the best. The decomposing ratio of methyl orange with the photoelectrocatalysis of composite films at voltage 0.2-6V all increased unstably.At the same time, the distance from films to pole plank also had the effects on the photocatalytic activities of the films.

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