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Northwestern University., Mechanical Engineering.

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Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration./
Author:	Yao, Yuan.
Description:	179 p.
Notes:	Advisers: Richard M. Lueptow; Kimberly A. Gray.
Contained By:	Dissertation Abstracts International70-04B.
Subject:	Engineering, Environmental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3352546
ISBN:	9781109103663

Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration.
Yao, Yuan.

Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration. - 179 p.

Advisers: Richard M. Lueptow; Kimberly A. Gray.

Thesis (Ph.D.)--Northwestern University, 2009.

The ultimate goal of this research is to fabricate a highly reactive photocatalyst composed of TiO2 and carbon nanotubes (CNTs) and to apply TiO 2 photocatalysis in a rotating filtration system for water purification. We synthesized nanostructured assemblies composed of different proportions of anatase (5 or 100 nm) or rutile (1.2 mum), and either single- or multi-walled CNTs, using a simple low temperature process. The nanostructured composite assembled from the 100 nm anatase and single-walled CNTs (SWCNTs) exhibited enhanced and selective photocatalytic oxidation of phenol in comparison to both pure anatase and Degussa P25. A mechanism for the enhanced reactivity is proposed in which electrons are shuttled from TiO2 particles to the SWCNTs as a result of an optimal TiO2/CNT arrangement that stabilizes charge separation and reduces charge recombination. SWCNTs can also substantially improve the uniformity and coverage of TiO2 coatings on porous ZrO2 membranes. The TiO2/SWCNT composite forms a complete and uniform coating on ZrO2 membranes at pH 5 (&sim;100% coverage). We also created a rutile/SWCNT composite that exhibits enhanced photocatalytic reactivity compared to pure rutile for phenol oxidation. The rutile/SWCNT composites, P25, and anatase/SWCNT compostes were deposited on alumina membranes and used for membrane filtration. The membranes deposited with anatase/SWCNT composites show the highest photocatalytic reactivity for phenol oxidation. The optimum density for the deposition of the anatase/SWCNT composite on porous membranes for reactive filtration is 0.33 mg/cm2. Three generations of rotating filtration systems were designed and fabricated for bio-fouling formation tests. Cylindrical ceramic (ZrO2/TiO2) porous filters (1.4 mum pore size) were coated with several types of TiO2 and TiO2/SWCNT composites and were tested in a 195-hour long bio-fouling test using the latest generation system, a 6-filter rotating filtration system. Results indicate that the anatase/SWCNT 100:1 composite holds potential for bio-fouling control.

ISBN: 9781109103663Subjects--Topical Terms:

783782
Engineering, Environmental.

Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration.
LDR:03236nam 2200337 a 45 001 855289
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020 $a 9781109103663
035 $a (UMI)AAI3352546
035 $a AAI3352546
040 $a UMI $c UMI
100 1 $a Yao, Yuan. $3 1021863
245 1 0 $a Titanium dioxide/carbon nanotube composite for photoreactive membrane filtration.
300 $a 179 p.
500 $a Advisers: Richard M. Lueptow; Kimberly A. Gray.
500 $a Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: 2546.
502 $a Thesis (Ph.D.)--Northwestern University, 2009.
520 $a The ultimate goal of this research is to fabricate a highly reactive photocatalyst composed of TiO2 and carbon nanotubes (CNTs) and to apply TiO 2 photocatalysis in a rotating filtration system for water purification. We synthesized nanostructured assemblies composed of different proportions of anatase (5 or 100 nm) or rutile (1.2 mum), and either single- or multi-walled CNTs, using a simple low temperature process. The nanostructured composite assembled from the 100 nm anatase and single-walled CNTs (SWCNTs) exhibited enhanced and selective photocatalytic oxidation of phenol in comparison to both pure anatase and Degussa P25. A mechanism for the enhanced reactivity is proposed in which electrons are shuttled from TiO2 particles to the SWCNTs as a result of an optimal TiO2/CNT arrangement that stabilizes charge separation and reduces charge recombination. SWCNTs can also substantially improve the uniformity and coverage of TiO2 coatings on porous ZrO2 membranes. The TiO2/SWCNT composite forms a complete and uniform coating on ZrO2 membranes at pH 5 (&sim;100% coverage). We also created a rutile/SWCNT composite that exhibits enhanced photocatalytic reactivity compared to pure rutile for phenol oxidation. The rutile/SWCNT composites, P25, and anatase/SWCNT compostes were deposited on alumina membranes and used for membrane filtration. The membranes deposited with anatase/SWCNT composites show the highest photocatalytic reactivity for phenol oxidation. The optimum density for the deposition of the anatase/SWCNT composite on porous membranes for reactive filtration is 0.33 mg/cm2. Three generations of rotating filtration systems were designed and fabricated for bio-fouling formation tests. Cylindrical ceramic (ZrO2/TiO2) porous filters (1.4 mum pore size) were coated with several types of TiO2 and TiO2/SWCNT composites and were tested in a 195-hour long bio-fouling test using the latest generation system, a 6-filter rotating filtration system. Results indicate that the anatase/SWCNT 100:1 composite holds potential for bio-fouling control.
590 $a School code: 0163.
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0548
690 $a 0775
710 2 $a Northwestern University. $b Mechanical Engineering. $3 1018403
773 0 $t Dissertation Abstracts International $g 70-04B.
790 $a 0163
790 1 0 $a Brinson, L. Catherine $e committee member
790 1 0 $a Gray, Kimberly A. $e committee member
790 1 0 $a Gray, Kimberly A., $e advisor
790 1 0 $a Lueptow, Richard M. $e committee member
790 1 0 $a Lueptow, Richard M., $e advisor
790 1 0 $a Packman, Aaron $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3352546