期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 254, 期 -, 页码 36-45出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.03.053
关键词
Amphoteric grafting chitosan-based flocculants; Dye removal; Flocculation performance; Flocculation mechanism; Fractal dimension
资金
- Natural Science Foundation of China [51073077, 50938004, 50825802]
- State Key Laboratory of Pollution Control and Resource Reuse of Nanjing University [PCRRF11004]
- Scientific Research Foundation of Graduate School of Nanjing University [2012CL06]
In the current work, a series of amphoteric grafting chitosan-based flocculants (carboxymethyl chitosan-graft-polyacrylamide, denoted as CMC-g-PAM) was designed and prepared successfully. The flocculants were applied to eliminate various dyes from aqueous solutions. Among different graft copolymers, CMC-g-PAM11 with a PAM grafting ratio of 74% demonstrated the most efficient performance for removal of both the anionic dye (Methyl Orange, MO) and the cationic dye (Basic Bright Yellow, 7GL) under the corresponding favored conditions (80 mg/L of the flocculant at pH 4.0, and 160 mg/L at pH 11.0). In comparison with its precursors, chitosan and carboxymethyl chitosan, CMC-g-PAM11 showed higher removal efficiencies and wider flocculation windows. More importantly, the graft copolymer produced notably more compacted flocs based on image analysis in combination with fractal theory, which was of great significance in practical water treatment. Furthermore, the flocculation mechanism was discussed in detail. The grafted polyacrylamide chains were found to contribute much to the improved bridging and sweeping flocculation effects, but reduced charge neutralization flocculation for the effect of charge screening. (C) 2013 Elsevier B.V. All rights reserved.
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