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PEG hydrogels as anti-fouling coatin...

Sagle, Alyson Conner.

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PEG hydrogels as anti-fouling coatings for reverse osmosis membranes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	PEG hydrogels as anti-fouling coatings for reverse osmosis membranes./
Author:	Sagle, Alyson Conner.
Description:	186 p.
Notes:	Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 5010.
Contained By:	Dissertation Abstracts International70-08B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3369184
ISBN:	9781109310238

PEG hydrogels as anti-fouling coatings for reverse osmosis membranes.
Sagle, Alyson Conner.

PEG hydrogels as anti-fouling coatings for reverse osmosis membranes. - 186 p.

Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 5010.

Thesis (Ph.D.)--The University of Texas at Austin, 2009.

Water is becoming increasingly scarce as the demand for fresh water continues to rise. One potential new water resource is purified produced water. Produced water is generated during oil and gas production, and it is often contaminated with emulsified oil, high levels of salt, and particulate matter. Produced water purification using polymer membranes has been investigated, but its implementation is limited by membrane fouling. This study focused on the preparation and application of poly(ethylene glycol) (PEG) hydrogels as fouling-resistant coatings for commercial reverse osmosis (RO) membranes.

ISBN: 9781109310238Subjects--Topical Terms:

1018428
Chemistry, Polymer.

PEG hydrogels as anti-fouling coatings for reverse osmosis membranes.
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008 130515s2009 ||||||||||||||||| ||eng d
020 $a 9781109310238
035 $a (UMI)AAI3369184
035 $a AAI3369184
040 $a UMI $c UMI
100 1 $a Sagle, Alyson Conner. $3 1682740
245 1 0 $a PEG hydrogels as anti-fouling coatings for reverse osmosis membranes.
300 $a 186 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-08, Section: B, page: 5010.
500 $a Advisers: Benny D. Freeman; Mukul M. Sharma.
502 $a Thesis (Ph.D.)--The University of Texas at Austin, 2009.
520 $a Water is becoming increasingly scarce as the demand for fresh water continues to rise. One potential new water resource is purified produced water. Produced water is generated during oil and gas production, and it is often contaminated with emulsified oil, high levels of salt, and particulate matter. Produced water purification using polymer membranes has been investigated, but its implementation is limited by membrane fouling. This study focused on the preparation and application of poly(ethylene glycol) (PEG) hydrogels as fouling-resistant coatings for commercial reverse osmosis (RO) membranes.
520 $a To prepare fouling-resistant coatings for RO membranes, three series of copolymer hydrogel networks were synthesized using poly(ethylene glycol) diacrylate (PEGDA) as the crosslinker and acrylic acid (AA), 2-hydroxyethyl acrylate (HEA), or poly(ethylene glycol) acrylate (PEGA) as comonomers, and their transport properties were evaluated. The hydrogels have high water uptake and high water permeability, and crosslink density strongly influences water uptake and water permeability. For example, a 100 mol% PEGDA hydrogel contained 61% water by volume, but 80PEGA, which has essentially the same chemical composition but lower crosslink density, contained 72% water by volume. Hydrogel water permeability ranged from 10 to 26 (L microm)/(m2 hr bar) and correlates well with water uptake; high water uptake often leads to high water permeability. Additionally, the copolymers have hydrophilic surfaces with a low affinity for oil, based on contact angle measurements using n-decane in water.
520 $a Commercial RO membranes (AG RO membrane from GE Water and Process Technologies) were coated with PEG hydrogels, and the desalination and fouling resistance properties of the coated membranes were tested. The water flux of coated membranes and a series-resistance model were used to estimate coating thickness; the coatings were approximately 2 microm thick. NaCl rejection for both uncoated and coated membranes was 99.0% or greater. As determined by zeta potential measurements, both uncoated and coated RO membranes are negatively-charged, but coated membranes are less negatively-charged than uncoated RO membranes. Model oil/water emulsions, prepared with either a cationic or an anionic surfactant, were used to probe membrane fouling. In the absence of oil, surfactant charge, and therefore, electrostatic interactions play a significant role in membrane fouling. In the presence of DTAB, a cationic surfactant, the AG RO membrane water flux immediately dropped to 30% of its initial value, but in the presence of SDS, an anionic surfactant, its water flux gradually decreased to 74% of its initial value after 24 hours. However, in both cases, coated membranes exhibited less flux decline than uncoated membranes. Coated membranes also experienced little fouling in the presence of an n-decane/DTAB emulsion. After 24 hours, the water flux of a PEGDA-coated AG RO membrane was 73% of its initial value, while the water flux of an AG RO membrane fell to 26% of its initial value. Conversely, both coated and uncoated membranes fouled significantly in the presence of an n-decane/SDS emulsion, indicating that oil fouling is controlled both by electrostatic and hydrophobic interactions. Overall, this work provides answers to some of the fundamental questions posed regarding the viability of using modified membranes for produced water treatment.
590 $a School code: 0227.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0495
690 $a 0542
710 2 $a The University of Texas at Austin. $b Chemical Engineering. $3 1023637
773 0 $t Dissertation Abstracts International $g 70-08B.
790 1 0 $a Freeman, Benny D., $e advisor
790 1 0 $a Sharma, Mukul M., $e advisor
790 1 0 $a Paul, Donald R. $e committee member
790 1 0 $a Sanchez, Isaac C. $e committee member
790 1 0 $a Kloos, Steven W. $e committee member
790 $a 0227
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3369184