Phase Transformations and Photocatalytic Activity of TiO2 Powders Preparation via Microwave-Assisted Sol-Gel Method

2013 ◽  
Vol 717 ◽  
pp. 79-83
Author(s):  
Weerachai Sangchay ◽  
Pichet Chantawee ◽  
Weerachai Madtharak
Keyword(s):  
Phase Transformations ◽  
Anatase Phase ◽  
Sol Gel ◽  
Microwave Oven ◽  
Study Phase ◽  
Photocatalytic Efficiency ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted ◽  
Photocatalytic Activities

The purpose of this research was to study phase transformation and photocatalytic properties of TiO2powders. TiO2powders were prepared by microwave-assisted sol-gel method. The prepared powders were refluxed at 18 W to 450 W for 1 h and dried at 180 W for 1 h by a conventional microwave oven. The phase transformations of powders were characterized by XRD and photocatalytic activities of powders were evaluated by UV-Vis spectrophotometer. The results show all samples reveal that only the anatase phase and has the crystallite size is 13.8, 10.3 and 9.2 nm when the refluxed at 180, 300 and 450 W. It was found that TiO2powders refluxed at 450 W were found to give the highest photocatalytic efficiency is about 90.06% under UV irradiation for 6 h.

Antibacterial and photocatalytic activities of controllable (anatase/rutile) mixed phase TiO2 nanophotocatalysts synthesized via a microwave-assisted sol–gel method

2020 ◽  
Vol 44 (2) ◽  
pp. 562-570 ◽  
Author(s):  
Karima Almashhori ◽  
Tarek T. Ali ◽  
Abdu Saeed ◽  
Reem Alwafi ◽  
Magda Aly ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Sol Gel ◽  
Single Source ◽  
Constant Concentration ◽  
Structure Directing Agent ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted ◽  
Single Source Precursor ◽  
Photocatalytic Activities

TiO2 with different ratios of anatase/rutile phases were synthesized via a microwave assisted sol–gel method and by applying a single source precursor (SSP) with a constant concentration of nitric acid that was used as the structure directing agent.

scholarly journals Synthesizing and Evaluating the Photocatalytic and Antibacterial Ability of TiO2/SiO2 Nanocomposite for Silicate Coating

2021 ◽  
Vol 9 ◽  
Author(s):  
Manh-Cuong Le ◽  
Thu-Huong Le ◽  
Thanh-Huyen Bui Thi ◽  
Quang-Dat Nguyen ◽  
Thanh-Ha Do Thi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Silicate Coating ◽  
Gel Method ◽  
Sol Gel Method ◽  
Antibacterial Ability

The TiO2/SiO2 nanocomposite has been synthesized by a sol-gel method and investigated the effect of the SiO2 content (0, 5, 10, 15, 20, and 50%) on the rutile-to-anatase phase transition of TiO2 NPs. In order to increase the photocatalytic efficiency of the nanocomposite and decrease the price of material, the TiO2/SiO2 Nc with content SiO2 of 15% sample is chosen for preparing silicate coating. The efficiency of photocatalytic MB and antibacterial ability in the air of W silicate coating (adding TiO2/SiO2 Nc (15%)) achieve almost 100% for 60 h and 94.35% for 3 h, respectively. While the efficiency of photocatalytic MB and antibacterial ability of WO silicate coating (adding commercial TiO2/SiO2) is about 25–30% for 60 h and 6.02% for 3 h, respectively. The presence of TiO2/SiO2 Nc (15%) with a larger surface area in W silicate coating can provide increased centers for absorption, photocatalytic reaction, and the contact between sample and bacteria lead to enhance the photocatalytic and antibacterial ability of W silicate coating.

Preparation of Ti/B Binary Oxides by Sol-Gel Method and Their Photocatalytic Activity for Stoichiometric H2O Decomposition

1996 ◽  
Vol 454 ◽  
Author(s):  
S. C. Moon ◽  
S. Tabata ◽  
K. Okada ◽  
M. Fujiki ◽  
H. Mametsuka
Keyword(s):  
Titanium Oxide ◽  
Anatase Phase ◽  
Aqueous Suspension ◽  
Sol Gel ◽  
Rutile Phase ◽  
Binary Oxide ◽  
Gel Method ◽  
Sol Gel Method ◽  
Binary Oxides ◽  
Photocatalytic Activities

ABSTRACTA titanium-boron binary oxide has been prepared by the sol-gel method and characterized using SEM, TEM, UV-VIS reflectance, and X-ray diffraction spectroscopies. These measurements indicated that the obtained Ti/B gel with no treatment exhibited an amorphous structure. After calcination in O2, the crystalline structure of titanium oxide species in the Ti/B binary oxide was changed while boron oxide species maintained in the state of amorphous. Titanium oxide species in the Ti/B binary oxide calcined at 673 K showed an anatase phase of TiO2, and changed with the calcination temperatures from anatase phase to rutile phase. The Pt loaded Ti/B photocatalysts in aqueous suspension system decomposed water stoichiometrically under UV-irradiation. Their photocatalytic activities decreased with increasing the calcination temperature, indicating the photocatalytic activities of the Ti/B binary oxides were depended on the crystal phase of titanium oxide in the Ti/B photocatalysts.

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.

The structure and magnetic properties of pure single phase BiFeO3 nanoparticles by microwave-assisted sol-gel method

2018 ◽  
Vol 735 ◽  
pp. 945-949 ◽  
Author(s):  
Shuai Zheng ◽  
Jiangying Wang ◽  
Jingji Zhang ◽  
Hongliang Ge ◽  
Zhi Chen ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Microwave Assisted ◽  
Bifeo3 Nanoparticles

Influence of Preparation Methods of TiO2 Nano-Particle on Photodegradation of Methylene Blue

2020 ◽  
Vol 998 ◽  
pp. 84-89
Author(s):  
Jittinat Sirichokthanasarp ◽  
Dang Trung Tri Trinh ◽  
Du Ang Dao Channei ◽  
Kantapat Chansaenpak ◽  
Wilawan Khanitchaidecha ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Hydrothermal Method ◽  
Organic Compounds ◽  
High Efficiency ◽  
Anatase Phase ◽  
Sol Gel ◽  
Nano Particles ◽  
Preparation Methods ◽  
Gel Method ◽  
Sol Gel Method

The dye-pigments and organic compounds are known as significant pollutants in wastewater of textile industrial. Among of treatment technologies, the photocatalysis using TiO2 nano particles has potential on-site process for removing the dye-pigments and organic compounds, due to no hazardous waste and inexpensive. In this work, the TiO2 nanoparticles were synthesized by two different methods of hydrothermal and sol-gel. Nanoparticle of TiO2 synthesized by hydrothermal method contained pure anatase phase as similar as the TiO2 nanoparticles synthesized by sol-gel method. However, the TiO2 synthesized by hydrothermal method provided the higher specific surface area and pore volume rather than the another TiO2. Further, the high efficiency 86% of methylene blue photodegradation was observed during the by using TiO2 synthesized by hydrothermal method as photocatalyst, whereas the efficiency was only 72% for TiO2 synthesized by sol-gel method.

Photocatalytic Activities of Ce3+-Doped TiO2 Thin Films Prepared by Sol-Gel Method

2011 ◽  
Vol 239-242 ◽  
pp. 1850-1853
Author(s):  
Shu Kai Zheng
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Atomic Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Annealing Temperatures ◽  
Glass Slides ◽  
Photocatalytic Activities

A series of TiO2 thin films with and without Ce3+ doping were successfully obtained on microscope glass slides by sol-gel method. The photocatalytic activities of the pure TiO2 and Ce3+-doped TiO2 thin films were evaluated by the degradation of rhodamine B solution. The effects of both Ce3+ contents and annealing temperatures on the photocatalytic activities of the samples were examined. The results indicated that the TiO2 thin film with an atomic ratio of Ti:Ce=5:1 annealed at 300°C had a higher photocatalytic activity among the samples.

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.

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