Effects of solution pH and UV irradiation on the streaming potential of the titanium dioxide membranes

2006 ◽  
Vol 282 (1-2) ◽  
pp. 342-350 ◽  
Author(s):  
W WANG ◽  
Y KU
Keyword(s):  
Titanium Dioxide ◽  
Uv Irradiation ◽  
Streaming Potential ◽  
Solution Ph

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.

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

scholarly journals Influence of solution pH on degradation of atrazine during UV and UV/H2O2 oxidation: kinetics, mechanism, and degradation pathways

RSC Advances ◽  
2019 ◽  
Vol 9 (61) ◽  
pp. 35847-35861 ◽  
Author(s):  
Yucan Liu ◽  
Kai Zhu ◽  
Miaomiao Su ◽  
Huayu Zhu ◽  
Jianbo Lu ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Oxidation Kinetics ◽  
Irradiation Time ◽  
Degradation Mechanism ◽  
Degradation Pathways ◽  
Solution Ph ◽  
H2o2 Oxidation ◽  
Ph Conditions

The kinetics, degradation mechanism and degradation pathways of atrazine (ATZ) during sole-UV and UV/H2O2 processes under various pH conditions were investigated; the effects of UV irradiation time and H2O2 dose were also evaluated.

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.

Synthesis, Characterization and Photocatalytic Properties of CdS Nanorods

2012 ◽  
Vol 535-537 ◽  
pp. 264-267 ◽  
Author(s):  
Li Juan Xie ◽  
Li Mei Duan ◽  
Ling Xu ◽  
Yin Wang ◽  
Xiao Lei Wang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Methyl Orange ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Raw Material ◽  
Cadmium Nitrate ◽  
Solution Ph ◽  
Methyl Orange Degradation ◽  
Diethylene Triamine ◽  
Cds Nanorods

CdS Nanorods have been successfully prepared by hydrothermal synthesis technology by using cadmium nitrate and thiourea as the raw material,by using diethylene triamine as the template agent. The samples were characterized by the technique of XRD、TEM and SEM. The results indicated that the products were pure hexagonal CdS. This paper also used the samples as photocatalysts to study the degradation the solution of methyl orange. The concentration of methyl orange was unchanged during the process of experiment. We also investigated the effect of the amount of catalyst, and pH of the solution on the degradation rate of methyl orange. The experimental results showed that methyl orange degradation rate reached 90% with the amount of catalyst 0.020 g, solution pH of 3.5 and UV irradiation 120 min.

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 Highly efficient removal of thallium(I) by facilely fabricated amorphous titanium dioxide from water and wastewater

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Gaosheng Zhang ◽  
Jinglin Luo ◽  
Hanlin Cao ◽  
Shengping Hu ◽  
Huosheng Li ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
High Efficiency ◽  
Ph Value ◽  
Hydroxyl Group ◽  
Precipitation Method ◽  
Solution Ph ◽  
Surface Complexes ◽  
Environmental Friendliness ◽  
Mining Wastewater ◽  
The One

AbstractIn this study, amorphous hydrous titanium dioxide was synthesized by a facile precipitation method at room temperature, aiming to effectively remove thallium(I) from water. The titanium dioxide prepared using ammonia as precipitant (TiO2I) is more effective for thallium(I) uptake than the one synthesized with sodium hydroxide (TiO2II). The TiO2 obtained particles are amorphous, aggregates of many nanoparticles and irregular in shape. The thallium(I) uptake increases with the rise of solution pH value. Under neutral pH conditions, the maximal thallium(I) adsorption capacities of TiO2I and TiO2II are 302.6 and 230.3 mg/g, respectively, outperforming most of the reported adsorbents. The amorphous TiO2 has high selectivity towards thallium(I) in the presence of multiple cations such as K+, Ca2+, Mg2+, Zn2+ and Ni2+. Moreover, the TiO2I is efficient in removing thallium(I) from real river water and mining wastewater. Additionally, the spent TiO2I can be regenerated using hydrochloric acid solution and reused. The Tl(I) adsorption is achieved via replacing the H+ in hydroxyl group on the surface of TiO2 and forming inner-sphere surface complexes. Owing to its high efficiency, facile synthesis and environmental friendliness, the TiO2I has the potential to be used as an alternative adsorbent to remove Tl(I) from water.

Co-transport of graphene oxide and titanium dioxide nanoparticles in saturated quartz sand: Influences of solution pH and metal ions

2019 ◽  
Vol 251 ◽  
pp. 723-730 ◽  
Author(s):  
Tianjiao Xia ◽  
Yixuan Lin ◽  
Xuetao Guo ◽  
Shunli Li ◽  
Jingshan Cui ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Graphene Oxide ◽  
Metal Ions ◽  
Quartz Sand ◽  
Titanium Dioxide Nanoparticles ◽  
Solution Ph

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.

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