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Doped titanium oxide photcatalysts: ...

Li, Qi.

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Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses./
作者:	Li, Qi.
面頁冊數:	155 p.
附註:	Adviser: Jian Ku Shang.
Contained By:	Dissertation Abstracts International68-11B.
標題:	Engineering, Environmental. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3290295
ISBN:	9780549340843

Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses.
Li, Qi.

Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses. - 155 p.

Adviser: Jian Ku Shang.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.

Since the discovery of photoelectrochemical splitting of water on n-titanium oxide (n-TiO2) electrodes by Fujishima and Honda in 1972, there has been much interest in semiconductor-based materials as photocatalysts for both solar energy conversion and environmental applications in the past several decades. Among various semiconductor-based photocatalysts, TiO2 is the only candidate suitable for industrial use because of its high chemical stability, good photoactivity, relatively low cost, and nontoxicity. However, the photocatalytic capability of TiO 2 is limited to only ultraviolet (UV) light (wavelength, lambda, < 400 nm), seriously limiting its solar efficiency.

ISBN: 9780549340843Subjects--Topical Terms:

783782
Engineering, Environmental.

Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses.
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245 1 0 $a Doped titanium oxide photcatalysts: Preparation, structure and interaction with viruses.
300 $a 155 p.
500 $a Adviser: Jian Ku Shang.
500 $a Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7600.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.
520 $a Since the discovery of photoelectrochemical splitting of water on n-titanium oxide (n-TiO2) electrodes by Fujishima and Honda in 1972, there has been much interest in semiconductor-based materials as photocatalysts for both solar energy conversion and environmental applications in the past several decades. Among various semiconductor-based photocatalysts, TiO2 is the only candidate suitable for industrial use because of its high chemical stability, good photoactivity, relatively low cost, and nontoxicity. However, the photocatalytic capability of TiO 2 is limited to only ultraviolet (UV) light (wavelength, lambda, < 400 nm), seriously limiting its solar efficiency.
520 $a In this study, both chemical and physical modification approaches were developed to extend the absorption band-edge of TiO2 into the visible light region with improved stability, photocatalytic efficiency and ease of the doping process. Two major approaches were used in the material synthesis and processing, including the ion-beam-assisted-deposition (IBAD) technique and sol-gel based processes. Both nitrogen-doped TiO2 (TiON) and nitrogen/palladium co-doped TiO2 (TiON/PdO) photocatalysts were created and their photocatalytic activity was investigated by the degradation of methylene blue (MB) and disinfection of bacteria and viruses under visible light illumination. The sol-gel process was optimized to produce high quality TiON-based photocatalysts by carefully modulating the precursor ratio and calcination temperature. A TiON inverse opal structure was created, which demonstrated enhanced visible light absorption and subsequently improved photocatalytic efficiency by the combination of chemical and physical modifications on n-TiO2. The effect of palladium dopant on the optical and photocatalytic properties of TiON/PdO photocatalyst was examined, which suggests that a careful optimization of the transition metal ion dopant concentration is needed to achieve high photocatalytic efficiency in these anion and transition metal ion co-doped TiO2 photocatalysts. High photocatalytic virus disinfection efficiency under visible-light illumination was observed for the first time with TiON/PdO photocatalyst, and the interaction between MS2 virus and TiO2-based semiconductor surfaces was successfully modulated. A strategy to use atomic force microscope (AFM) to conduct in-situ observation of viruses on semiconductor surfaces in aqueous environment was developed, which combines information from both height profile and phase profile and solves the difficulty of observing small nanosized biomolecules on substrates with similar feature sizes.
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