Study of Ozone Decomposition Using TiO2-Graphene Composites

2014 ◽  
Vol 716-717 ◽  
pp. 102-107
Author(s):  
Xin Tan ◽  
Qian Qian Shang ◽  
Si Yu Wang
Keyword(s):  
Titanium Dioxide ◽  
Graphite Oxide ◽  
Sol Gel ◽  
Graphite Powder ◽  
Light Irradiation ◽  
Tetrabutyl Titanate ◽  
Ozone Decomposition ◽  
Initial Concentration ◽  
Hummers Method ◽  
Modified Hummers Method

Graphene (Gn) were prepared by reduction of graphite oxide (GO), which was obtained from oxidation of graphite powder by a modified Hummers method. The composite of titanium dioxide/graphene (TiO2/Gn) was synthesized using tetrabutyl titanate and GO as the precursors by a sol-gel method. The ozone photodecomposition efficiency of TiO2/Gn was operated under ultraviolet-visible (UV-Vis, λ>365nm) light irradiation. Results showed that as-prepared TiO2/Gn composite exhibited photodecomposition efficiency of 66.12% under UV-Vis light irradiation 1h with the initial concentration of 0.150ppm-0.200ppm, preliminary larger than that of pure TiO2(25.95%), self-photolysis of ozone without photocatalysts (1.33%). The effects of initial concentration of ozone and photodecomposition mechanism were discussed.

Anodic Aqueous Electrophoretic Deposition of Graphene Oxide on Copper Using Different Cathode Materials

2020 ◽  
Vol 1008 ◽  
pp. 21-27
Author(s):  
Essam Hares ◽  
Ahmed Hassan El-Shazly ◽  
Marwa Farouk El-Kady ◽  
Kholoud Madih ◽  
Hamdiya Orleans-Boham ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Graphite Oxide ◽  
Cathode Materials ◽  
Aqueous Suspension ◽  
Graphite Powder ◽  
Liquid Exfoliation ◽  
Hummers Method ◽  
Oxide Deposition ◽  
Modified Hummers Method

The effect of four different cathode materials on the anodic deposition of graphene oxide (GO) nanosheets was studied experimentally. First, synthesis of graphite oxide from graphite powder was done by modified Hummers' method. Ultrasonic technique was adopted for the preparation of the stable aqueous suspension of GO by using liquid exfoliation of graphite oxide. Deposition of GO coating on copper sheets (the anode) was done via electrophoretic deposition (EPD) at the same operating condition (5V, 2 min, concentration of 0.5 mg/ml of GO per deionized water) with different cathode materials (copper, stainless steel, aluminum and graphite). The coatings’ morphological and microstructure were investigated using scanning electron microscope (SEM) and the effect of the current density in the EPD process was obtained. The change in the deposition weight was also measured. It was ascertained that the cathode’s material is a major factor can affect the GO’s EPD process and the characteristics of the final coating.

Photocatalytic Degradation of Methyl Violet with H3PW6Mo6O40/SiO2 Sensitized by H2O2

2013 ◽  
Vol 709 ◽  
pp. 70-73
Author(s):  
Guo Bin Duan ◽  
Yong Kui Huang ◽  
Li Yu ◽  
Shui Jin Yang
Keyword(s):  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Sol Gel ◽  
Methyl Violet ◽  
Light Irradiation ◽  
Natural Light ◽  
Order Kinetic ◽  
Initial Concentration ◽  
First Order ◽  
Order Kinetic Model

H3PW6Mo6O40/SiO2 was prepared by sol-gel method, and sensitized by H2O2 solution. The photocatalytic degradation of methyl violet by H3PW6Mo6O40/SiO2 under simulated natural light irradiation was investigated. The results demonstrated that at optimal condition (initial concentration of methyl violet is 10 mg/L, and the pH is 2.5, the dosage of catalyst is 0.5% based on feed stocks), the degradation rate of methyl violet is as high as 88.7 % after 2.5h simulated natural light irradiation. The reaction of photocatalysis for methyl violet can be expressed as first-order kinetic model.

Control over the morphology and phase of MnOx formed in the modified Hummers' method and impact on the electrocapacitive properties of MnOx–graphite oxide composite electrodes

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44717-44722 ◽  
Author(s):  
Xiaoming Sun ◽  
Peng Liu ◽  
Yi Gu ◽  
Thomas E. Rufford ◽  
X. S. Zhao
Keyword(s):  
Composite Materials ◽  
Graphite Oxide ◽  
Crystalline Phase ◽  
Manganese Oxides ◽  
Composite Electrodes ◽  
Oxide Composite ◽  
Hummers Method ◽  
Modified Hummers Method

The controllable morphology and crystalline phase of manganese oxides formed in the Hummer's method have an impact on the electrocapacitive performance of the resulting composite materials.

Enhancement of Hydrophobility and Thermal Property of Graphene Oxide by Paratoluidine Chemical Functionalization

2014 ◽  
Vol 809-810 ◽  
pp. 243-247
Author(s):  
Zhi Jia Luo ◽  
Hong Zhang Geng ◽  
Song Ting Zhang ◽  
Bao Tan Du ◽  
Xing Zhang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Graphene Oxide ◽  
Thermal Property ◽  
Functional Groups ◽  
Drug Delivery Systems ◽  
Graphite Powder ◽  
Hydroxyl Groups ◽  
Chemical Functionalization ◽  
Hummers Method ◽  
Modified Hummers Method

Graphene oxide (GO) is typically synthesized by graphite powder under strong oxidizing reaction, possessing with the same set of functional groups: epoxy and hydroxyl in basal plane and carboxyl and hydroxyl groups existence on the flake edges which endow GO with amphipathy. GO and its functionalized derivatives have been successfully tested in many domains, such as polymer composites, biosensors, drug delivery systems, etc. In this paper, GO was prepared by a modified Hummers method employing improved process (preparation and separation), aiming at industrialization with the lowest cost. Moreover, some novel functional groups with different properties were controlled chemically grafted onto GO to modify the wettability and reaction activity with other materials. The hydrophobicity and the thermal property of graphene oxide were enhanced by chemical functionalization.

Enhanced Photocatalytic Activity of TiO2/Graphene Oxide Nanocomposites Prepared by the Sol-Gel Method

2013 ◽  
Vol 302 ◽  
pp. 176-181 ◽  
Author(s):  
Chun Hua Cao
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Graphite Oxide ◽  
Raw Materials ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Tetrabutyl Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Transmission Electron

TiO2/graphene oxide (TiO2/GO) nanocomposites were prepared by the sol-gel method using tetrabutyl titanate and graphite oxide as the main raw materials. The microstructure of TiO2/GO nanocomposites was analyzed by X-ray diffraction and transmission electron microscopy. The results showed that graphene oxide was uniformly covered with sphere-like anatase TiO2 nanoparticles, which had a diameter of about 10 nm. Reactive brilliant red X-3B (X-3B) was used as model pollutant to study the photocatalytic activity of the composites. The effect of key factors on X-3B degradation was investigated. The results indicated that the photocatalytic activity of TiO2/GO nanocomposites was higher than that of pure TiO2 and the mixture of TiO2 and graphite oxide under the same conditions, and the nanocomposites had the best photocatalytic activity, when the content of graphene oxide was 100 mg. Moreover, it was found that the rate of photocatalytic degradation decreased with the increase of the initial dye concentration, and the optimum amount of nanocomposites was 0.8g/L when the initial concentration of X-3B solution was 100 mg/L, and the degradation rate could reach 96% after 60 min irradiation.

Degradation of Congo Red in Wastewater Using Nanometer TiO2 Film under UV Light Irradiation

2013 ◽  
Vol 643 ◽  
pp. 178-181 ◽  
Author(s):  
Peng Tian ◽  
Wen Le Du ◽  
Zhi Guo Zheng ◽  
Jie Lu ◽  
Qing Yang Chen ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Congo Red ◽  
Uv Light ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Complexing Agent ◽  
Solution Ph ◽  
Titanium Dioxide Films ◽  
Heat Treated ◽  
Coating Method

Synthesis of titanium dioxide sol was prepared by sol-gel method, using tetrabutyl titanate as source, ethanol as solvent, acetic acid as complexing agent. A transparent sol aging in air 30min, titanium dioxide films were prepared by using spin coating method. Congo red degradation was investigated by TiO2photocatalysis. Study the efficiency of decolorization was influenced by the coating times, heat-treated time, the initial concentration of congo red and solution pH.

Preparation of Titanium Dioxide Sol and its Application on Tussah Silk Fixation with Vegetable Dye

2013 ◽  
Vol 821-822 ◽  
pp. 618-621
Author(s):  
Yan Hua Lu ◽  
Ming Su Song ◽  
Jie Lin
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Sol Gel ◽  
Average Diameter ◽  
Tetrabutyl Titanate ◽  
Test Results ◽  
Gel Method ◽  
Sol Gel Method ◽  
Washing Fastness ◽  
Particle Size Analyzer

In this paper, nanosol of titanium dioxide was prepared by sol-gel method using tetrabutyl-titanate as a precursor. The Particle Size Analyzer test results showed that the average diameter of the particles was less than 10 nm, and most particle size ranged from 6nm to 16nm. The prepared mechanism was discussed and then applied to fixation of vegetable turmeric dyed tussah silk. The fixation results indicated that the rubber fastness and washing fastness increased remarkably and the K/S values changed a little.

Synthesis and Structural Characterization of Surface-Modified TiO2

2010 ◽  
Vol 129-131 ◽  
pp. 154-158 ◽  
Author(s):  
Bao Wei Hao ◽  
Yuan Li ◽  
Shi Zhao Wang
Keyword(s):  
Titanium Dioxide ◽  
Oleic Acid ◽  
Structural Characterization ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Nano Structure ◽  
Gel Method ◽  
Surface Modified ◽  
Nano Titanium Dioxide

oleic acid-modified nano-titanium dioxide were synthesized by Oleic acid and tetrabutyl titanate via the sol-gel method, and characterized by IR TEM TG-DT A and XPS. Comparison with the data of the IR, the combination of carboxyl is chelating with Ti atoms. Based on the analysis of IR, TG-DTA and XPS, this paper suggests a model about the oleic acid-modified titanium dioxide nano-structure, and to provide a basis for future applications.

Photocatalytic Degradation of Active Brilliant Red on TiO2/SiO2 Composite Catalysts

2012 ◽  
Vol 488-489 ◽  
pp. 221-225 ◽  
Author(s):  
Chun Hua Cao
Keyword(s):  
Photocatalytic Activity ◽  
Raw Materials ◽  
Sol Gel ◽  
Tetraethyl Orthosilicate ◽  
Molar Ratio ◽  
Tetrabutyl Titanate ◽  
Initial Concentration ◽  
Composite Catalysts ◽  
Composite Photocatalysts ◽  
Calcined Temperature

TiO2/SiO2composite catalysts were prepared using two-step sol-gel method, with tetrabutyl titanate and tetraethyl orthosilicate as the main raw materials, and its photocatalytic properties for degradation of active brilliant red X-3B solution were researched throuth Ti:Si molar ratio, calcined temperature, initial concentration and photocatalyst dosage. The results indicate that the TiO2/SiO2composite catalysts prepared with Ti:Si molar ratio of 6, calcination at 500°C have the best photocatalytic activity, and the photocatalytic activity of the composite materials is higher than that of pure TiO2under the same conditions; moreover, it was found that degradation rate of active brilliant red X-3B solution increased with its lower initial concentration, and the optimum dosage of composite photocatalysts is 1.6g/L when the initial concentration of active brilliant red X-3B solution is 25mg/L.

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