Charge Separation and Trapping in N-Doped TiO2 Photocatalysts: A Time-Resolved Microwave Conductivity Study

2010 ◽  
Vol 1 (22) ◽  
pp. 3261-3265 ◽  
Author(s):  
Ryuzi Katoh ◽  
Akihiro Furube ◽  
Ken-ichi Yamanaka ◽  
Takeshi Morikawa
Keyword(s):  
Charge Separation ◽  
Microwave Conductivity ◽  
Time Resolved ◽  
Tio2 Photocatalysts ◽  
Doped Tio2

Photon-induced charge separation in molecular systems studied by time-resolved microwave conductivity: molecular optoelectric switches

1991 ◽  
Author(s):  
John M. Warman ◽  
Stephan A. Jonker ◽  
Matthijs P. de Haas ◽  
Jan W. Verhoeven ◽  
Michael N. Paddon-Row
Keyword(s):  
Charge Separation ◽  
Microwave Conductivity ◽  
Time Resolved ◽  
Molecular Systems ◽  
Induced Charge

Time-resolved microwave conductivity study of charge carrier dynamics in commercially available TiO2 photocatalysts

2015 ◽  
Vol 3 (30) ◽  
pp. 15466-15472 ◽  
Author(s):  
Shohei Nakajima ◽  
Ryuzi Katoh
Keyword(s):  
Charge Carrier ◽  
Carrier Dynamics ◽  
Microwave Conductivity ◽  
Time Resolved ◽  
Tio2 Photocatalysts ◽  
Charge Carrier Dynamics

Charge carrier dynamics in various commercially available TiO2 photocatalysts was studied by means of the time-resolved microwave conductivity (TRMC) technique.

scholarly journals Recent Developments of Advanced Ti3+-Self-Doped TiO2 for Efficient Visible-Light-Driven Photocatalysis

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 679 ◽  
Author(s):  
Siyoung Na ◽  
Sohyeon Seo ◽  
Hyoyoung Lee
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Defect Density ◽  
Low Cost ◽  
Natural Environments ◽  
Electronic Band ◽  
Environmental Friendliness ◽  
Tio2 Photocatalysts ◽  
Doped Tio2 ◽  
Photogenerated Electrons

Research into the development of efficient semiconductor photocatalytic materials is a promising approach to solving environmental and energy problems worldwide. Among these materials, TiO2 photocatalysts are one of the most commonly used due to their efficient photoactivity, high stability, low cost and environmental friendliness. However, since the UV content of sunlight is less than 5%, the development of visible light-activated TiO2-based photocatalysts is essential to increase the solar energy efficiency. Here, we review recent works on advanced visible light-activated Ti3+-self-doped TiO2 (Ti3+–TiO2) photocatalysts with improved electronic band structures for efficient charge separation. We analyze the different methods used to produce Ti3+–TiO2 photocatalysts, where Ti3+ with a high oxygen defect density can be used for energy production from visible light. We categorize advanced modifications in electronic states of Ti3+–TiO2 by improving their photocatalytic activity. Ti3+–TiO2 photocatalysts with large charge separation and low recombination of photogenerated electrons and holes can be practically applied for energy conversion and advanced oxidation processes in natural environments and deserve significant attention.

scholarly journals Magnetic Ni-Doped TiO2 Photocatalysts for Disinfection of Escherichia coli Bacteria

2021 ◽  
Author(s):  
Khang Cao Nguyen ◽  
Nghia Manh Nguyen ◽  
Van Quoc Duong ◽  
Khanh Van Nguyen ◽  
Hung Manh Nguyen ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Tio2 Photocatalysts ◽  
Doped Tio2 ◽  
Escherichia Coli Bacteria

scholarly journals Modified-TiO2 Photocatalyst Supported on β-SiC Foams for the Elimination of Gaseous Diethyl Sulfide as an Analog for Chemical Warfare Agent: Towards the Development of a Photoreactor Prototype

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 403
Author(s):  
Armelle Sengele ◽  
Didier Robert ◽  
Nicolas Keller ◽  
Valérie Keller
Keyword(s):  
Photocatalytic Oxidation ◽  
Chemical Warfare Agents ◽  
Chemical Warfare Agent ◽  
Chemical Warfare ◽  
Diethyl Sulfide ◽  
Tio2 Photocatalysts ◽  
Doped Tio2 ◽  
Model Molecule ◽  
Warfare Agents ◽  
Oxidation Efficiency

In the context of the increase in chemical threat due to warfare agents, the development of efficient methods for destruction of Chemical Warfare Agents (CWAs) are of first importance both for civilian and military purposes. Amongst possible methods for destruction of CWAs, photocatalytic oxidation is an alternative one. The present paper reports on the preparation of Ta and Sn doped TiO2 photocatalysts immobilized on β-SiC foams for the elimination of diethyl sulfide (DES) used as a model molecule mimicking Yperite (Mustard Gas) in gaseous phase. Photo-oxidation efficiency of doped TiO2 catalyst has been compared with TiO2-P25. Here, we demonstrate that the Sn doped-TiO2 with a Polyethylene glycol (PEG)/TiO2 ratio of 7 exhibits the best initial activity (up to 90%) but is deactivates more quickly than Ta doped-TiO2 (40% after 800 min). The activity of the catalysts is strongly influenced by the adsorption properties of the support, as β-SiC foams adsorb DES and other sulfur compounds. This adsorption makes it possible to limit the poisoning of the catalysts and to maintain an acceptable conversion rate even after ten hours under continuous DES flow. Washing with NaOH completely regenerates the catalyst after a firs treatment and even seems to “wash” it by removing impurities initially present on the foams.

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