二甲基烯丙基木质素季铵盐-海藻酸钠两性聚电解质的絮凝性能研究

Flocculation performance of dimethylallyl quaternary ammonium salts of lignin-sodium alginate polyampholyte

为了扩大碱木质素的相对分子质量以及其对阳离子染料的应用范围,研究了以二甲基烯丙基木质素季铵盐(DL)和海藻酸钠(SA)为原料,制备二甲基烯丙基木质素季铵盐-海藻酸钠两性聚电解质(DL-SA)。采用FT-IR、SEM和TG/DTG表征了产物的结构,并考察了其两性聚合物的特点——等电点,结果表明,DL和SA接枝成功,其等电点为4.42,具有两性化合物的特征。以对酸性黑ATT和亚甲基蓝为模拟染料,研究了DL-SA对两种不同类型的染料絮凝影响因素(投加量、pH值和温度),确定了对两种染料的最佳絮凝条件以及最佳脱色率为酸性黑ATT 86.24%,亚甲基蓝99.15%,并初步探讨了其絮凝机理。

In order to improve the molecular weight and its application on cationic dyes,trimethyl quaternary ammonium salt of lignin-sodium alginate polyampholyte (DL-SA)was prepared with trimethyl quaternary am-monium salt of lignin (DL)and sodium alginate (SA).Its structure was analyzed by FT-IR,SEM and TG/DTG,and it was investigated amphoteric polymer characteristics,ie,isoelectric point,which was found that DL and SA was grafted successfully,whose isoelectric point was 4.22 and it has compound characteristics.The effects (dosage,pH and temperature)of DL-SA on the flocculation performance of dyes were investigated with methylene blue and acid black ATT water as the representative dyes,which the removal rate of acid black ATT was 86.24% and that of methylene blue was 99.15%.It also was confirmed the optimum flocculating conditions on the two kinds of dyes and preliminary studied its flocculation mechanism.