阳离子度对疏水化阳离子型絮凝剂脱色性能的影响

Effects of cationic degree on decolorization properties of hydrophobic cationic flocculant

在水溶液中,用过硫酸钾(K2S2O8)/亚硫酸氢钠(NaHSO3)作引发剂,以顺丁烯二酸酐酯化改性过的β-环糊精衍生物(β-CD-MAH)、二甲基二烯丙基氯化铵(DMDAAC)和甲基丙烯酸甲酯(MMA)为反应单体,制得不同阳离子度的疏水化β-环糊精阳离子型絮凝剂P(β-CD-MAH-co-DMDAAC-co-MMA)。通过分析不同阳离子度絮凝剂对活性艳蓝FBN和酸性蓝324等阴离子染液的絮凝脱色性能可知,絮凝剂的阳离子度越高,达到最高脱色率所需的絮凝剂最佳用量越少;在相同的碱性pH、盐质量浓度下,阳离子度较低的絮凝剂对染液的脱色率更高,其耐盐性、耐碱性较好;在给定疏水化阳离子絮凝剂-阴离子染液体系中,絮凝剂分子与染料分子之间的相互作用是以静电结合为主、疏水作用为辅的协同作用。

In aqueous solution, the different cationic degrees of hydrophobic beta-cyclodextrin-based cationic flocculant P(β-CD-MAH-co-DMDAAC-co-MMA) were synthesized, in which potassium persulfate and sodium bisulfite were used as initiators, the derivative of β-cyclodextrin(β-CD-MAH) modified by malefic anhydride methyl, dimethyl dially ammonium chloride(DMDAAC) and methyl methacrylate(MMA) were used as monomers. The flocculated decolorization properties of different cationic degrees of flocculant for anionic dye of reactive brilliant blue(FBN) and acid blue 324 solutions were analyzed. The results showed that the higher cationic degree of the flocculant, the less dosage of the flocculant was used to achieve the highest decolorization rate, the lower cationic degree of the flocculant had higher decolorization rate and better anti-salt and alkali resistance properties in the condition of the same alkaline pH and salt concentration. Moreover, in the given hydrophobic cationic flocculant-anionic dye solutions, the interaction between flocculant molecular and dyestuff molecular expressed as synergistic effect of dominating electrostatic bonding with the association of hydrophobic interaction.