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Permanent link (DOI): https://doi.org/10.7939/R3CH4Z

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Design, Synthesis, Characterization of a new pH-Responsive Copolymer and its Application in Oil Sands Tailings Treatment Open Access

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Other title
Subject/Keyword
pH-responsive polymer
flocculation and compaction
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Guo, Jian
Supervisor and department
Xu, Zhenghe (Chemical and Materials Engineering)
Liu, Qingxia (Chemical and Materials Engineering)
Examining committee member and department
Soares, Joao (Chemical and Materials Engineering)
Xu, Zhenghe (Chemical and Materials Engineering)
Liu, Qingxia (Chemical and Materials Engineering)
Dubljevic, Stevan (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2015-02-03T13:45:09Z
Graduation date
2015-06
Degree
Master of Science
Degree level
Master's
Abstract
This research aims at treating mature fine tailings (MFT) with a novel pH-responsive copolymer poly (N,N-dimethylaminoethyl methacrylate-co-acrylamide-co-acrylic acid) p(DMAEMA-co-AM-co-AA). Compared with conventional polyacrylamide (PAM), the conformation and property of this novel copolymer can be switched by pH variation, enhancing the compaction of settled/flocculated tailings furthermore. The copolymer was synthesized with 16, 20 and 24 hours respectively. The characterization, by mass spectrometry, Fourier Transform Infrared spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR), turbidity and viscosity measurements, of this novel copolymer were conducted. Mechanism of conformational change by pH-switching was proposed. The flocculation of this copolymer was investigated to determine the optimal dosage. Moreover, the compaction of settled/flocculated tailings was achieved by changing the pH due to the change of conformation. Initial settling rate, supernatant turbidity, solid content, yield stress and water drainage of the sediment were examined to study the optimal condition of pH-responsive flocculant for treating MFT. QCM-D was used to study the adsorption of this copolymer on the silica surface and the copolymer’s conformational change at varied pHs.
Language
English
DOI
doi:10.7939/R3CH4Z
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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