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

Polymer nanocomposite membranes with...

Crock, Christopher A.

Linked to FindBook

Google Book

Amazon

博客來

Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation./
Author:	Crock, Christopher A.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	164 p.
Notes:	Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
Contained By:	Dissertation Abstracts International77-07B(E).
Subject:	Environmental engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10027133
ISBN:	9781339526416

Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation.
Crock, Christopher A.

Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 164 p.

Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.

Thesis (Ph.D.)--Michigan State University, 2016.

Halogenated organics are categorized as primary pollutants by the Environmental Protection Agency. Trichloroethylene (TCE), which had broad industrial use in the past, shows persistence in the environment because of its chemical stability. The large scale use and poor control of TCE resulted in its prolonged release into the environment before the carcinogenic risk associated with TCE was fully understood. TCE pollution stemmed from industrial effluents and improper disposal of solvent waste. Membrane reactors are promising technology for treating TCE polluted groundwater because of the high throughput, relatively low cost of membrane fabrication and facile retrofitting of existing membrane based water treatment facilities with catalytic membrane reactors. Compared to catalytic fluidized or fixed bed reactors, catalytic membrane reactors feature minimal diffusional limitation. Additionally, embedding catalyst within the membrane avoids the need for catalyst recovery and can prevent aggregation of catalytic nanoparticles. In this work, Pd/xGnP, Pd-Au/xGnP, and commercial Pd/Al2O3 nanoparticles were employed in batch and flow-through membrane reactors to catalyze the dehalogenation of TCE in the presence of dissolved H2. Bimetallic Pd-Au/xGnP catalysts were shown to be more active than monometallic Pd/xGnP or commercial Pd/Al 2O3 catalysts. In addition to synthesizing nanocomposite membranes for high-throughput TCE dehalogenation, the membrane based dehalogenation process was designed to minimize the detrimental impact of common catalyst poisons (S2-, HS-, and H2S -) by concurrent oxidation of sulfide species to gypsum in the presence of Ca2+ and removal of gypsum through membrane filtration. The engineered membrane dehalogenation process demonstrated that bimetallic Pd-Au/xGnP catalysts resisted deactivation by residual sulfide species after oxidation, and showed complete removal of gypsum during membrane filtration.

ISBN: 9781339526416Subjects--Topical Terms:

548583
Environmental engineering.

Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation.
LDR:02921nmm a2200301 4500 001 2119161
005 20170619080556.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781339526416
035 $a (MiAaPQ)AAI10027133
035 $a AAI10027133
040 $a MiAaPQ $c MiAaPQ
100 1 $a Crock, Christopher A. $3 3281017
245 1 0 $a Polymer nanocomposite membranes with hierarchically structured catalysts for high throughput dehalogenation.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 164 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
500 $a Adviser: Volodymyr V. Tarabara.
502 $a Thesis (Ph.D.)--Michigan State University, 2016.
520 $a Halogenated organics are categorized as primary pollutants by the Environmental Protection Agency. Trichloroethylene (TCE), which had broad industrial use in the past, shows persistence in the environment because of its chemical stability. The large scale use and poor control of TCE resulted in its prolonged release into the environment before the carcinogenic risk associated with TCE was fully understood. TCE pollution stemmed from industrial effluents and improper disposal of solvent waste. Membrane reactors are promising technology for treating TCE polluted groundwater because of the high throughput, relatively low cost of membrane fabrication and facile retrofitting of existing membrane based water treatment facilities with catalytic membrane reactors. Compared to catalytic fluidized or fixed bed reactors, catalytic membrane reactors feature minimal diffusional limitation. Additionally, embedding catalyst within the membrane avoids the need for catalyst recovery and can prevent aggregation of catalytic nanoparticles. In this work, Pd/xGnP, Pd-Au/xGnP, and commercial Pd/Al2O3 nanoparticles were employed in batch and flow-through membrane reactors to catalyze the dehalogenation of TCE in the presence of dissolved H2. Bimetallic Pd-Au/xGnP catalysts were shown to be more active than monometallic Pd/xGnP or commercial Pd/Al 2O3 catalysts. In addition to synthesizing nanocomposite membranes for high-throughput TCE dehalogenation, the membrane based dehalogenation process was designed to minimize the detrimental impact of common catalyst poisons (S2-, HS-, and H2S -) by concurrent oxidation of sulfide species to gypsum in the presence of Ca2+ and removal of gypsum through membrane filtration. The engineered membrane dehalogenation process demonstrated that bimetallic Pd-Au/xGnP catalysts resisted deactivation by residual sulfide species after oxidation, and showed complete removal of gypsum during membrane filtration.
590 $a School code: 0128.
650 4 $a Environmental engineering. $3 548583
650 4 $a Chemical engineering. $3 560457
650 4 $a Nanoscience. $3 587832
690 $a 0775
690 $a 0542
690 $a 0565
710 2 $a Michigan State University. $b Environmental Engineering - Doctor of Philosophy. $3 3189971
773 0 $t Dissertation Abstracts International $g 77-07B(E).
790 $a 0128
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10027133