Effects of Silica-Coating on the Photoinduced Hole Formation and Decomposition Activity of Titanium Dioxide Photocatalysts Under UV Irradiation

2012 ◽  
Vol 142 (12) ◽  
pp. 1474-1481 ◽  
Author(s):  
Junichi Oguma ◽  
Yusuke Kakuma ◽  
Masami Nishikawa ◽  
Yoshio Nosaka
Keyword(s):  
Titanium Dioxide ◽  
Uv Irradiation ◽  
Silica Coating ◽  
Hole Formation

Manganese Oxide Photodeposited onto Titanium Dioxide as a New Environmental Catalyst

2005 ◽  
Vol 480-481 ◽  
pp. 117-122 ◽  
Author(s):  
Ayumu Tateoka ◽  
Yoshika Sekine ◽  
Takamasa Tsuda ◽  
Takanobu Ohashi
Keyword(s):  
Carbon Dioxide ◽  
Titanium Dioxide ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Room Temperature ◽  
Complex Oxide ◽  
Environmental Catalysis ◽  
Environmental Catalyst ◽  
Formaldehyde In Air

Authors have successfully synthesized a new environmental catalysis which reacted with harmful formaldehyde in air at room temperature. Although manganese oxide is practically used for a major ingredient of formaldehyde removing materials, intermediates such as formate formed on the surface reduced the removal efficiency. Then, manganese oxide was photodeposited onto the surface of titanium dioxide particles which could decompose certain organic compounds with UV irradiation. It was confirmed that the complex oxide decomposed formaldehyde into carbon dioxide at room temperature. Moreover, UV irradiation enhanced the production of the carbon dioxide.

Adsorption of Bromic Acid Ion in Water by the Reduced Titanium Oxide

2012 ◽  
Vol 724 ◽  
pp. 97-100
Author(s):  
Eiji Watanabe ◽  
Kaori Nishizawa ◽  
Masato Tazawa
Keyword(s):  
Drinking Water ◽  
Titanium Dioxide ◽  
Titanium Oxide ◽  
Uv Irradiation ◽  
Health Hazard ◽  
Gas Atmosphere ◽  
Bromide Ion ◽  
High Possibility ◽  
Bromic Acid

Because bromic acid ion generated by the ozone processing of drinking water for sterilization is strong carcinogenic, there is a high possibility in persons health hazard. The titanium dioxide was reduced at 900-degree Centigrade by the gas atmosphere (CO or H2). It was found that the concentration of the bromic acid ion in water was decreased at time when the reduced titanium oxide was added to water including the bromic acid ion. The bromic acid ion in water could be adsorbed by the titanium oxide reduced. In addition, it was suggested that the bromic acid ion could be decomposed into the bromide ion with low carcinogenic by using the photocatalitic function of titanium oxide under UV irradiation.

scholarly journals Improve Indoor Air Quality by Using Titanium Dioxide as Coating Photocatalyses under UV Irradiation

2011 ◽  
Vol 6 (2) ◽  
pp. 99-103 ◽  
Author(s):  
Arafa Awadalla ◽  
Muhammad Fauzi Mohd Zain ◽  
Abdul Amir Kadhum ◽  
Zeinab Abdalla
Keyword(s):  
Titanium Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Uv Irradiation ◽  
Indoor Air

scholarly journals Influence of titanium dioxide modification on the antibacterial properties

2016 ◽  
Vol 18 (4) ◽  
pp. 56-64 ◽  
Author(s):  
Paulina Rokicka ◽  
Agata Markowska-Szczupak ◽  
Łukasz Kowalczyk ◽  
Ewa Kowalska ◽  
Antoni W. Morawski
Keyword(s):  
Escherichia Coli ◽  
Titanium Dioxide ◽  
Uv Irradiation ◽  
Antibacterial Properties ◽  
Sunlight Irradiation ◽  
Dark Incubation ◽  
Disinfection Process ◽  
Chemical Factory ◽  
Dark Conditions ◽  
Group Chemical

Abstract Antibacterial properties of 15 titania photocatalysts, mono- and dual-modified with nitrogen and carbon were examined. Amorphous TiO2, supplied by Azoty Group Chemical Factory Police S.A., was used as titania source (Ar-TiO2, C-TiO2, N-TiO2 and N,C-TiO2 calcined at 300°C, 400°C, 500°C, 600°C, 700°C). The disinfection ability was examined against Escherichia coli K12 under irradiation with UV and artificial sunlight and in dark conditions. It has been found the development of new photocatalysts with enhanced interaction ability with microorganisms might be a useful strategy to improve disinfection method conducted under artificial sunlight irradiation. The efficiency of disinfection process conducted under artificial sunlight irradiation with carbon (C-TiO2) and carbon/nitrogen (N,C-TiO2) photocatalysts was similar as obtained under UV irradiation. Furthermore, during dark incubation, any toxicity of the photocatalyst was noted.

Effects of pH, Temperature and Various Anions on Thiourea Disappearance in Aqueous Media with Titanium Dioxide Under UV-Irradiation. Photomineralization Kinetics

2001 ◽  
Vol 66 (4) ◽  
pp. 676-684 ◽  
Author(s):  
Abdelghani Boussaoud ◽  
Gerard Duc ◽  
Jean Pierre Meille ◽  
Michelle Petit-Ramel
Keyword(s):  
Titanium Dioxide ◽  
Uv Irradiation ◽  
Initial Rate ◽  
Aqueous Media ◽  
Inorganic Anions ◽  
Disappearance Rate ◽  
Initial Concentration ◽  
Effects Of Ph ◽  
Nitrite Nitrate ◽  
Kinetics Of

Disappearance of thiourea in aqueous suspensions of TiO2 or ZnO occurs under near-UV irradiation. The effects of some parameters such as initial concentration of thiourea, temperature, pH and common inorganic anions were examined. The results indicate that the process follows the Langmuir-Hinshelwood type kinetics. In the presence of anions such as nitrates, chlorides and sulfates, the initial disappearance rate of thiourea at pH 6 drops. It is found that the initial rate of thiourea disappearance increases when temperatue of reaction mixture increases. Finally, kinetics of thiourea photomineralization to nitrite, nitrate, sulfite and sulfate are established.

Photocatalytic Decolorization of Dyes for Nano-Structures of Titanium Dioxide (TiO2) Films

2010 ◽  
Vol 93-94 ◽  
pp. 603-606 ◽  
Author(s):  
K. Hathaisamit ◽  
W. Pengmula ◽  
T. Wesamula ◽  
Sayan Pudwat
Keyword(s):  
Titanium Dioxide ◽  
Uv Irradiation ◽  
Organic Dyes ◽  
Irradiation Time ◽  
Tio2 Films ◽  
Dc Magnetron Sputtering ◽  
Peak Wavelength ◽  
Photocatalytic Decolorization ◽  
Nano Structures ◽  
Photocatalytic Activities

Application of nano-structures of titanium dioxide (TiO2) films on photocatalytic activities of organic dyes was investigated. Methylene blue (MB) and cation yellow X-Gl 200% were used as organic dyes to observe decolorization. The TiO2 films were prepared on glass substrate by reactive DC magnetron sputtering. The films had thickness, grain size and root mean square surface roughness of 300 nm,  40 nm and  4 nm, respectively. Coated-TiO2 on glass and uncoated TiO2 (glass) were immerged in MB and cation yellow dyes solution. A weak ultraviolet (UV) A at peak wavelength  365 nm and intensity of 0.19 mW/cm2 was irradiated. Absorbance spectra of dyes at different UV irradiation time were observed. The efficiency of decolorization increased as UV irradiation time increased. At UV irradiation time 120 hours, coated-TiO2 showed higher percentage decolorization of MB than uncoated-TiO2 about 64%. While, at UV irradiation time 48 hours, coated-TiO2 showed higher percentage decolorization of cation yellow than uncoated-TiO2 about 84%. Under photocatalysis process of TiO2 films, at the end, MB (about 120 hours) and cation yellow dyes (about 48 hours) change to be colorless.

Photocatalytic Degradation of the Cyanotoxin Cylindrospermopsin, using Titanium Dioxide and UV Irradiation

2001 ◽  
Vol 35 (5) ◽  
pp. 1245-1255 ◽  
Author(s):  
P.-J Senogles ◽  
J.A Scott ◽  
G Shaw ◽  
H Stratton
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Uv Irradiation

Removal of Gas-Phase Elemental Mercury by Photocatalytic with Liquid Absorption

2012 ◽  
Vol 424-425 ◽  
pp. 430-434 ◽  
Author(s):  
Jie He Chen ◽  
Min Yu Sun ◽  
Jiang Wu ◽  
Ping He ◽  
Wei Guo Pan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Positive Impact ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Experimental Conditions ◽  
Removal Time ◽  
Degussa P25 ◽  
Nano Titanium Dioxide

In order to study the influence of UV irradiation, treat temperature of nano-titanium dioxide and intensity of UV irradiation on the mercury removal performance, experiments were carried out on a photocatalytic oxidization system to find the best experimental conditions. Commercial Degussa P25 was used as a photocatalyst loading on titanium mesh, and the mercury removal efficiency was stable at 8% in the absence of UV irradiation. Under the UV irradiation of 300W mercury lamp, the mercury removal efficiency surged to 100%. With the same light intensity, the same removal time, the mercury removal efficiency of nano-titanium dioxide calcinated at 100°C reached 92.2% after 0.5h while the mercury removal efficiency of nano-titanium dioxide calcinated at 500°C reached 93.6%. Intensity of UV irradiation has a positive impact on the mercury removal performance.

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