1. Amine-Cross-Linked Lignin-Based Polymer: Modification, Characterization, and Flocculating Performance in Humic Acid Coagulation
- Author
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Ruihua Li, Qinyan Yue, Wuchang Song, Baoyu Gao, Ruibao Jia, Meng Li, Shenglei Sun, and Xudan Yang
- Subjects
chemistry.chemical_classification ,Flocculation ,Renewable Energy, Sustainability and the Environment ,Chemistry ,General Chemical Engineering ,Cationic polymerization ,General Chemistry ,Polymer ,complex mixtures ,chemistry.chemical_compound ,Chemical engineering ,Zeta potential ,Environmental Chemistry ,Organic chemistry ,Coagulation (water treatment) ,Humic acid ,Lignin ,Solubility - Abstract
In this study, a lignin-based flocculant (LNF) was synthesized by grafting amine groups into alkali lignin containing papermaking sludge. Characterization of LNF, such as FTIR, zeta potential, cationic degree, viscosity, and molecular weight, showed that the product was a cationic polymer with high solubility. LNF was used with aluminum sulfate (AS) and polyaluminum chloride (PAC) in humic acid coagulation to demonstrate its efficiency. Coagulation behavior and floc properties of LNF+PAC and LNF+AS dual-coagulant were comparatively evaluated. Results showed that the coagulation aid effect of LNF was independent of aluminum species. Addition of LNF could enhance humic acid removal efficiency and floc properties including size, strength, and fractal dimension significantly. The effect of solution pH on coagulation processes was also studied. Dual-coagulants showed the same variation trend as that of aluminum-based coagulants but enhanced coagulation performance during the investigative pH range. Flocs forme...
- Published
- 2015