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Thermoresponsive Hydrogel for Dye Re...

Hubert, Ockiya Jr. Ockiya.

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Thermoresponsive Hydrogel for Dye Removal in Aqueous Solution.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermoresponsive Hydrogel for Dye Removal in Aqueous Solution./
Author:	Hubert, Ockiya Jr. Ockiya.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	53 p.
Notes:	Source: Masters Abstracts International, Volume: 80-06.
Contained By:	Masters Abstracts International80-06.
Subject:	Analytical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10982154
ISBN:	9780438709652

Thermoresponsive Hydrogel for Dye Removal in Aqueous Solution.
Hubert, Ockiya Jr. Ockiya.

Thermoresponsive Hydrogel for Dye Removal in Aqueous Solution. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 53 p.

Source: Masters Abstracts International, Volume: 80-06.

Thesis (M.S.)--North Carolina Central University, 2018.

This item must not be sold to any third party vendors.

Hyperbranched polyglycerol polymers have been studied and applied in different fields. They have also been incorporated with other inorganic nanocomposites. In this work, hyperbranched polyglycerol (HPG) is prepared by anion initiated ring opening polymerization of glycidol. The resulting HPG, confirmed by NMR analysis, is subsequently modified with acrylate terminal groups and crosslinked with N-isopropylacrylamide (NIPPAm) to make a Hyperbranched hydrogel (HPG-N hydrogel) alone and in the presence of Silicon dioxide SiO2, to create two hybrid hydrogels as potential membranes for water purification. AFM and SEM analysis confirmed that crosslinked hydrogels pore sizes range from 1.32-1.94µm. Thermogravimetric and Differential Scanning Calorimetry analysis confirmed the degradation of the hydrogels at three distinct temperatures 120°C, 340°C and 450°C and the thermal stability with the addition of SiO2 from 11% weight loss for the HPG hydrogel and 5% weight loss for HPG-N hydrogel with SiO2. Both hydrogel membranes were compared to the benchmark commercially available activated carbon (AC) for their ability to remove model congo red dye molecules from an aqueous solution. At temperatures higher than the lower critical solution temperature (LCST) of NIPPAm, which ranges around 32-35°C, higher removal percentages were observed. At 25°C HPG-N hydrogel outperformed hydrogels containing various SiO2 compositions with 74% removal of congo red. Dye removal efficiency was similar or better than commercially used activated carbon for all HPG-N based hydrogels when tested at temperatures 35°C-55°C. A wettability test was done to understand the contact angle and hydrophilicity of the hydrogel. All hydrogels showed high hydrophilicity with contact angles less than 90o. However, hydrogel with SiO2 showed more hydrophilicity than HPG-N hydrogel. The hydrophilicity correlates with the pore size of the hydrogel which explains the poor antifouling. Despite poor anti-fouling properties of the hydrogels (i.e. desorption efficiency under 10%), dye removal was restored to over 60% after a cleaning cycle at room temperature.

ISBN: 9780438709652Subjects--Topical Terms:

3168300
Analytical chemistry.

Thermoresponsive Hydrogel for Dye Removal in Aqueous Solution.
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300 $a 53 p.
500 $a Source: Masters Abstracts International, Volume: 80-06.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Taylor, Darlene K.
502 $a Thesis (M.S.)--North Carolina Central University, 2018.
506 $a This item must not be sold to any third party vendors.
520 $a Hyperbranched polyglycerol polymers have been studied and applied in different fields. They have also been incorporated with other inorganic nanocomposites. In this work, hyperbranched polyglycerol (HPG) is prepared by anion initiated ring opening polymerization of glycidol. The resulting HPG, confirmed by NMR analysis, is subsequently modified with acrylate terminal groups and crosslinked with N-isopropylacrylamide (NIPPAm) to make a Hyperbranched hydrogel (HPG-N hydrogel) alone and in the presence of Silicon dioxide SiO2, to create two hybrid hydrogels as potential membranes for water purification. AFM and SEM analysis confirmed that crosslinked hydrogels pore sizes range from 1.32-1.94µm. Thermogravimetric and Differential Scanning Calorimetry analysis confirmed the degradation of the hydrogels at three distinct temperatures 120°C, 340°C and 450°C and the thermal stability with the addition of SiO2 from 11% weight loss for the HPG hydrogel and 5% weight loss for HPG-N hydrogel with SiO2. Both hydrogel membranes were compared to the benchmark commercially available activated carbon (AC) for their ability to remove model congo red dye molecules from an aqueous solution. At temperatures higher than the lower critical solution temperature (LCST) of NIPPAm, which ranges around 32-35°C, higher removal percentages were observed. At 25°C HPG-N hydrogel outperformed hydrogels containing various SiO2 compositions with 74% removal of congo red. Dye removal efficiency was similar or better than commercially used activated carbon for all HPG-N based hydrogels when tested at temperatures 35°C-55°C. A wettability test was done to understand the contact angle and hydrophilicity of the hydrogel. All hydrogels showed high hydrophilicity with contact angles less than 90o. However, hydrogel with SiO2 showed more hydrophilicity than HPG-N hydrogel. The hydrophilicity correlates with the pore size of the hydrogel which explains the poor antifouling. Despite poor anti-fouling properties of the hydrogels (i.e. desorption efficiency under 10%), dye removal was restored to over 60% after a cleaning cycle at room temperature.
590 $a School code: 1733.
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