東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Nanocrystalline titania: Controllin...

Wahi, Raj.

Linked to FindBook

Google Book

Amazon

博客來

Nanocrystalline titania: Controlling physical properties and photocatalytic behavior.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Nanocrystalline titania: Controlling physical properties and photocatalytic behavior./
Author:	Wahi, Raj.
Description:	172 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1492.
Contained By:	Dissertation Abstracts International66-03B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168156
ISBN:	0542038382

Nanocrystalline titania: Controlling physical properties and photocatalytic behavior.
Wahi, Raj.

Nanocrystalline titania: Controlling physical properties and photocatalytic behavior. - 172 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1492.

Thesis (Ph.D.)--Rice University, 2005.

This dissertation describes a hydrothermal method for synthesizing titanium dioxide nanocrystals with controllable physical properties and explores the influence of such properties on the material's photocatalytic efficiency. The preparation of nanoscale titania from an alkoxide precursor in ethanol under mild hydrothermal conditions yields highly crystalline, thermally stable, phase-pure anatase dots whose sizes can be fine-tuned through adjustment of reaction temperature, precursor concentration, and water-to-alkoxide ratio. By optimizing the synthetic conditions, one may obtain grain sizes as small as 5.5 nm and surface areas up to 250 m2 g-1. The importance of various physical properties in determining the photocatalytic performance of nanocrystalline titania is investigated and clarified using photodegradation of an azo dye as a model reaction. Experimental photocatalytic activities, as quantified by dye half-life and Langmuir-Hinshelwood rate constants, confirm that anatase is an inherently superior photocatalyst to rutile and that activity enhancement due to anatase-rutile synergy in mixed-phase catalysts is contingent upon other factors such as the nature of the anatase-rutile interface. Also, it is shown for the first time that the shape of a titania nanocrystal significantly affects its photocatalytic efficiency. Specifically, rodlike anatase nanocrystals with predominantly (1 0 1) surfaces perform poorly as photocatalysts because the non-dissociative adsorption of water to these surfaces prevents efficient generation of the OH• radicals thought to be essential for photocatalytic oxidation.

ISBN: 0542038382Subjects--Topical Terms:

560527
Chemistry, Physical.

Nanocrystalline titania: Controlling physical properties and photocatalytic behavior.
LDR:02519nmm 2200277 4500 001 1818439
005 20060908145740.5
008 130610s2005 eng d
020 $a 0542038382
035 $a (UnM)AAI3168156
035 $a AAI3168156
040 $a UnM $c UnM
100 1 $a Wahi, Raj. $3 1907769
245 1 0 $a Nanocrystalline titania: Controlling physical properties and photocatalytic behavior.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1492.
500 $a Chair: Vicki L. Colvin.
502 $a Thesis (Ph.D.)--Rice University, 2005.
520 $a This dissertation describes a hydrothermal method for synthesizing titanium dioxide nanocrystals with controllable physical properties and explores the influence of such properties on the material's photocatalytic efficiency. The preparation of nanoscale titania from an alkoxide precursor in ethanol under mild hydrothermal conditions yields highly crystalline, thermally stable, phase-pure anatase dots whose sizes can be fine-tuned through adjustment of reaction temperature, precursor concentration, and water-to-alkoxide ratio. By optimizing the synthetic conditions, one may obtain grain sizes as small as 5.5 nm and surface areas up to 250 m2 g-1. The importance of various physical properties in determining the photocatalytic performance of nanocrystalline titania is investigated and clarified using photodegradation of an azo dye as a model reaction. Experimental photocatalytic activities, as quantified by dye half-life and Langmuir-Hinshelwood rate constants, confirm that anatase is an inherently superior photocatalyst to rutile and that activity enhancement due to anatase-rutile synergy in mixed-phase catalysts is contingent upon other factors such as the nature of the anatase-rutile interface. Also, it is shown for the first time that the shape of a titania nanocrystal significantly affects its photocatalytic efficiency. Specifically, rodlike anatase nanocrystals with predominantly (1 0 1) surfaces perform poorly as photocatalysts because the non-dissociative adsorption of water to these surfaces prevents efficient generation of the OH• radicals thought to be essential for photocatalytic oxidation.
590 $a School code: 0187.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0494
690 $a 0488
710 2 0 $a Rice University. $3 960124
773 0 $t Dissertation Abstracts International $g 66-03B.
790 1 0 $a Colvin, Vicki L., $e advisor
790 $a 0187
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168156