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Morphology and photocatalysis of tit...

Kelly, Sean Patrick.

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Morphology and photocatalysis of titanium dioxide aerogels.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Morphology and photocatalysis of titanium dioxide aerogels./
作者:	Kelly, Sean Patrick.
面頁冊數:	163 p.
附註:	Adviser: Micha Tomkiewicz.
Contained By:	Dissertation Abstracts International61-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9959193
ISBN:	0599626402

Morphology and photocatalysis of titanium dioxide aerogels.
Kelly, Sean Patrick.

Morphology and photocatalysis of titanium dioxide aerogels. - 163 p.

Adviser: Micha Tomkiewicz.

Thesis (Ph.D.)--City University of New York, 2000.

Pollution of our environment has become one of the most serious problems of this century. Titanium dioxide aerogels is composed of nanocrystallites of TiO2 close-packed in roughly spherical mesospheres, which are agglomerated to form a highly-porous sponge. Aerogel morphology produces porosities of around 80% and surface area that can be as large as 1000 m<super>2</super>/g. The aerogels efficiently adsorb organic materials from the environment and when illuminated with UV light, decompose or oxidize the organic pollutants, ultimately to safe by-products such as CO2 and H 2O.

ISBN: 0599626402Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Morphology and photocatalysis of titanium dioxide aerogels.
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100 1 $a Kelly, Sean Patrick. $3 1257297
245 1 0 $a Morphology and photocatalysis of titanium dioxide aerogels.
300 $a 163 p.
500 $a Adviser: Micha Tomkiewicz.
500 $a Source: Dissertation Abstracts International, Volume: 61-02, Section: B, page: 0901.
502 $a Thesis (Ph.D.)--City University of New York, 2000.
520 $a Pollution of our environment has become one of the most serious problems of this century. Titanium dioxide aerogels is composed of nanocrystallites of TiO2 close-packed in roughly spherical mesospheres, which are agglomerated to form a highly-porous sponge. Aerogel morphology produces porosities of around 80% and surface area that can be as large as 1000 m<super>2</super>/g. The aerogels efficiently adsorb organic materials from the environment and when illuminated with UV light, decompose or oxidize the organic pollutants, ultimately to safe by-products such as CO2 and H 2O.
520 $a In this work we modify the synthetic conditions to produce aerogels with different morphologies and measure the photocatalytic activity for photodecomposition of salicylic acid, as a function of size of the nanocrystallites. The results show that the quantum efficiency increases monotonically with the surface area and that the quantum efficiency per unit surface area increases linearly with the size of the nanocrystallites. These results are interpreted in terms of a “cracking model” of fixed size mesospheres and limited penetration of the salicylic acid into the mesospheres.
520 $a We use non-invasive, non-destructive techniques such as Raman scattering and EXAFS to follow the evolution of the TiO2 structure as it is generated in the sol-gel, as well as changes in the structure after the aerogel is made and modified by annealing. Both techniques reveal structural information in the liquid and solid phases and enable us to monitor the crystallinity in the gelation process in a way that might lead to an ability to control the synthetic process and achieve a desired morphology.
590 $a School code: 0046.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Environmental Sciences. $3 676987
650 4 $a Physics, Condensed Matter. $3 1018743
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710 2 0 $a City University of New York. $3 1018111
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791 $a Ph.D.
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