方润, 薛涵与, 吴华忠, 叶远松. 一锅法溶液缩聚制备高效阳离子絮凝剂及其絮凝性能[J]. 环境化学, 2018, 37(12): 2668-2676
FANG Run, XUE Hanyu, WU Huazhong, YE Yuansong. Synthesis of an efficient cationic flocculant by one-pot solution polycondensation and its flocculation performance[J]. Environmental Chemistry, 2018, 37(12): 2668-2676

方润1,2, 薛涵与1,2, 吴华忠1, 叶远松1
1. 闽江学院化工与材料系, 绿色染整福建省高校工程研究中心, 福州, 350108;
2. 福建省中国漆新型材料工程研究中心, 福州, 350108
关键词:    阳离子絮凝剂    溶液缩聚    絮凝机理    印染废水   
Synthesis of an efficient cationic flocculant by one-pot solution polycondensation and its flocculation performance
FANG Run1,2, XUE Hanyu1,2, WU Huazhong1, YE Yuansong1
1. Department of Chemical Engineering and Materials, Minjiang University, Engineering Research Center of Green Dyeing and Finishing in Fujian Provincial University, Fuzhou, 350108, China;
2. Fujian Engineering Research Center of New Chinese Lacquer Material, Fuzhou, 350108, China
A novel cationic polymeric flocculant (CPF) was prepared by one-pot solution polycondensation using acetone, dimethylamine, formaldehyde as raw materials. The molecular structure of CPF was characterized by IR, 1H-NMR, GPC and elemental analysis. Its decoloration performance in removing anionic dyes from dye wastewater was studied by batch experiments. Meanwhile, the flocculation mechanism was discussed. Results showed that the weight-averaged molecular weight of CPF was 1.81×104 and that CPF contained various functional groups such as amines, alcoholic hydroxyls, carbonyls and ethers. The presence of large amount of amine groups result in high cationicity of CPF through protonation. CPF's decoloration efficiency in removing anionic dyes from dye wastewater increased with decreasing pH and was not affected by inorganic salts. Higher than 95% decoloration efficiency was achieved in treating anionic dye wastewaters containing acid, direct or reactive dyes during the flocculation experiments. The flocculation was attributed to two simultaneous mechanisms involving adsorption by charge neutralization and aggregation by bridging. Although the COD removal rate was relatively low in the case of composite dye wastewater with complex components, the flocculation and decoloration efficiency of CPF was outstanding in treating actual dye wastewater. Therefore, CPF can be used as an effective flocculant as part of the combined physico-chemical and biological methods in treating the industrial dye wastewater.
Key words:    cationic flocculant    solution polycondensation    flocculent mechanism    dye wastewater   
收稿日期: 2018-04-20
基金项目: 国家自然科学基金(51703090),福建省自然科学基金(2016J05039)和闽江学院科技项目(MYK18024)资助.
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