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Sulfonated polyethersulfone and functionalized MWCNT/PVP nanocomposite membrane for protein separation

Irfan, Masooma (2017) Sulfonated polyethersulfone and functionalized MWCNT/PVP nanocomposite membrane for protein separation. PhD thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

There is an ever-increasing requirement for high purity protein production in industry and methods to separate the protein are in high demand. Polymeric ultrafiltration (UF) membranes are the key component for purification and separation of proteins, but high hydrophobicity, low flux and poor antifouling resistance of the membranes, restrict their use in the protein separation application. In the present study, sulfonated polyethersulfone (S-PES) and functionalized multiwall carbon nanotube (f-MWCNT) and polyvinyl-pyrrolidone (PVP) based nanocomposites (NCs) were used as additives to improve the antifouling and filtration properties of the PES-based ultrafiltration (UF) flat sheet membranes. The MWCNTs were first acid functionalized in order to improve their dispersion before blending with PVP to form NCs. In the first phase, the PES based UF membranes were synthesized with a variable weight percentage of NCs in the dimethylformamide (DMF). The chemistry of the NCs and their effect on the properties of PES membranes was analyzed by FTIR and XRD. The fabricated membranes were further characterized by FESEM, contact angle and water absorption tests. The AFM technique was also employed to provide an in-depth characterization of the membrane surface physical properties that included the characteristics of the grains in terms of its volume, perimeter, length, radius as well as surface roughness parameters. The antifouling study was conducted via measuring antifouling resistance parameters, including reversible, irreversible and total resistances with protein adhesion capacity and flux recovery rate. Results revealed that f-MWCNT and PVP were joined together by hydrogen bonding in the NCs and also in the membranes. The blending of NCs with PES decreased the contact angle which led to the high flux. Compared to the pristine PES membrane, the antifouling ability of PES membrane incorporated with f-MWCNT/PVP NC was greater, recording 81.7% flux recovery and 80.2% total resistance (>76% were reversible one).

Item Type: Thesis (PhD)
Subjects: T Technology > TP Chemical technology > TP250-261 Industrial electrochemistry
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 02 Jul 2018 02:55
Last Modified: 02 Jul 2018 02:55
URI: http://eprints.uthm.edu.my/id/eprint/10213
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