國立虎尾科技大學 |

Tunable Nanocomposite Membranes for Water Remediation and Separations.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Tunable Nanocomposite Membranes for Water Remediation and Separations./
Author:	Sierra, Sebastian Hernandez.
Description:	1 online resource (282 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
Contained By:	Dissertation Abstracts International78-11B(E).
Subject:	Chemical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369989489

Tunable Nanocomposite Membranes for Water Remediation and Separations.
Sierra, Sebastian Hernandez.

Tunable Nanocomposite Membranes for Water Remediation and Separations. - 1 online resource (282 pages)

Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.

Thesis (Ph.D.)

Includes bibliographical references

Nano-structured material fabrication using functionalized membranes with polyelectrolytes is a promising research field for water pollution, catalytic and mining applications. These responsive polymers react to external stimuli like temperature, pH, radiation, ionic strength or chemical composition. Such nanomaterials provide novel hybrid properties and can also be self-supported in addition to the membranes.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369989489Subjects--Topical Terms:

555952
Chemical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Tunable Nanocomposite Membranes for Water Remediation and Separations.
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020 $a 9781369989489
035 $a (MiAaPQ)AAI10628830
035 $a AAI10628830
040 $a MiAaPQ $b eng $c MiAaPQ
099 $a TUL $f hyy $c available through World Wide Web
100 1 $a Sierra, Sebastian Hernandez. $3 1179259
245 1 0 $a Tunable Nanocomposite Membranes for Water Remediation and Separations.
264 0 $c 2017
300 $a 1 online resource (282 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 78-11(E), Section: B.
500 $a Adviser: Dibakar Bhattacharyya.
502 $a Thesis (Ph.D.) $c University of Kentucky $d 2017.
504 $a Includes bibliographical references
520 $a Nano-structured material fabrication using functionalized membranes with polyelectrolytes is a promising research field for water pollution, catalytic and mining applications. These responsive polymers react to external stimuli like temperature, pH, radiation, ionic strength or chemical composition. Such nanomaterials provide novel hybrid properties and can also be self-supported in addition to the membranes.
520 $a Polyelectrolytes (as hydrogels) have pH responsiveness. The hydrogel moieties gain or lose protons based on the pH, displaying swelling properties. These responsive materials can be exploited to synthesize metal nanoparticles in situ using their functional groups, or to immobilize other polyelectrolytes and biomolecules. Due to their properties, these responsive materials prevent the loss of nanomaterials to the environment and improve reactivity due to their larger surface areas, expanding their range of applications.
520 $a The present work describes different techniques used to create nanocomposites based on poly(vinylidene fluoride) (PVDF) hollow fiber and flat sheet membranes, both thick sponge-like and thin. Due to their hydrophobicity, hollow fiber membranes were hydrophilized by a water-based green process of cross-linking polyvinylpyrrolidone (PVP) onto their surface. Commercial hydrophilic and hydrophilized lab-prepared membranes were subsequently functionalized with a poly(acrylic acid) (PAA) hydrogel through free radical polymerizations. This work advanced membrane functionalization, specifically flat sheet membranes, from lab-scale to full-scale by modifications of the polymerization procedures. The hydrogel functionalized membranes by redox polymerization showed an expected responsive behavior, represented by permeability variation at various pH values (4.0 ≤ pH ≤ 9.0), from 53.9 to 3.4 L/(m2EhEbar) and a change in effective pore size from 222 to 111 nm, being 3800 L/(m 2EhEbar) and 650 nm the former permeability and pore size values of the non-functionalized membrane. Then, throughout a double ion exchange of sodium/iron and a subsequent reduction, bimetallic Fe/Pd nanoparticles were synthesized in-situ. Similarly, it was possible to use the reacted accelerants of the redox polymerization to synthesize Fe0 nanoparticles.
520 $a These hydrogel-membrane systems with Fe/Pd nanoparticles were studied throughout the reduction of trichloroethylene (TCE). This work has demonstrated an effective improvement in TCE reduction by the variation of the supporting membrane types and the functionalization (polymerization and nanoparticle synthesis) processes. The TCE normalized dechlorination rates (k sa) are 3 times greater and 8 times for hollow fiber and sponge-like flat sheet membranes, respectively, than previous studies. For membrane supported Fe/Pd nanoparticles by redox functionalization, the dechlorination rates are similar to previous works in flat sheet membranes; and for the redox polymerized hydrogel, the dechlorination rates are the highest results with 1.3 times greater than the rates of solution-phase nanoparticles and 10 times the rate values of the membranes. All supports showed nonsignificant nanoparticle loss (up to 1%). Up to 80% of reduction was achieved within 2 hours with chloride production near to stoichiometric values (3:1), demonstrating absence of intermediates.
520 $a As an extension of the membrane functionalization, it was possible to immobilize Outer membrane protein F precursor (OmpF) from Escherichia coli within the PVDF membrane pore structure, using layer-by-layer (LbL) assembly of polyeletrolytes. This LbL technique allows to reuse the membranes numerous times, having reproducibility and greater selective rejections of uncharged (organic species) over charged solutes (small ions) than similar functionalized membranes without OmpF: 1.7 times and 2.0 times higher for Organic/CaCl2 and Organic/NaCl, respectively. Additionally, the permeability of OmpFmembranes is almost double of the non-OmpF: 2.6 to 1.5 L/(m2&dot;h&dot;bar).
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Chemical engineering. $3 555952
650 4 $a Nanotechnology. $3 557660
650 4 $a Environmental engineering. $3 557376
655 7 $a Electronic books. $2 local $3 554714
690 $a 0542
690 $a 0652
690 $a 0775
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Kentucky. $b Chemical and Materials Engineering. $3 1179260
773 0 $t Dissertation Abstracts International $g 78-11B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10628830 $z click for full text (PQDT)