期刊
CELLULOSE
卷 20, 期 5, 页码 2605-2614出版社
SPRINGER
DOI: 10.1007/s10570-013-9987-2
关键词
Hydrolyzed polyacrylamide grafted carboxymethyl cellulose Hydrolysis degree; Dye removal; Fractal theory; Flocculation mechanisms
资金
- Natural Science Foundation of China [51073077]
- Open Fund from State Key Laboratory of Pollution Control and Resource Reuse of Nanjing University [PCRRF11004]
In this present work, a series of hydrolyzed polyacrylamide grafted carboxymethyl cellulose (CMC-g-HPAM) was prepared. The structure and solution properties of CMC-g-HPAM were characterized by FTIR, H-1-NMR, elemental analysis and zeta potential measurements. The graft copolymers were applied as flocculants to remove methylene blue (MB), a cationic dye, from aqueous solutions. In comparison with its precursors, carboxymethyl cellulose (CMC) and polyacrylamide CMC-g-PAM, CMC-g-HPAM exhibited higher removal efficiencies. Furthermore, the flocculation performance of the copolymers was significantly improved with the increase of the hydrolysis degree, and the MB removal efficiency was more than 90 % when the hydrolysis degree of CMC-g-HPAM was higher than 80 %. More importantly, image analysis in combination with fractal theory demonstrated that the graft copolymers could produce notably denser and larger flocs, which was of great significance in practical water treatment. The improved flocculation performance was ascribed to both charge neutralization and bridging effects.
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