阳离子化树枝状聚(胺-酯)在染色废水中的应用

Application of Cationic Dendritic Poly( amide-ester) in Dyeing Wastewater

以端基为8个伯氨基的树枝状化合物[PAE(NH2)8]和阳离子试剂缩水甘油基三甲基氯化铵(GTAC)为原料合成了阳离子树枝状聚(胺-酯)(PAE-GTAC)。通过正交实验讨论了反应温度、反应时间及原料配比对产物产率的影响,并用红外光谱和核磁共振波谱对样品进行了结构表征。讨论了PAE-GTAC用量、离心时间及溶液pH对Cr3+及染料(甲基橙、达旦黄及二甲酚橙)去除率的影响。结果表明,当反应温度为45℃,反应时间为5 h,原料配比为n[PAE(NH2)8]∶n(GTAC)=1∶16时,以异丙醇为溶剂,产物产率为66.28%;当pH=8.87,以3 000r/min的转速离心13 min,用25 mL PAE-GTAC(c=0.01 mol/L)溶液处理10 mL CrCl3(c=0.1 mol/L)溶液时,Cr3+的去除率最高,为97.56%;当pH=1.51、2.03及1.52,振荡处理15 min后,以3 000 r/min的转速离心10min,用25 mL PAE-GTAC(c=0.01 mol/L)溶液处理10 mL染料(c=1.2×10-5mol/L)水溶液时,甲基橙、达旦黄及二甲酚橙的去除率最高,分别为84.16%、92.25%及97.35%。

Cationic poly（amide-ester） （PAE-GTAC） was synthesized from dendritic poly（amine-ester）[PAE（NH2）8] and glycidyl trimethyl ammonium chloride（GTAC）. The effects of reaction temperature, reaction time and the mole ratio of reactants on the product yield were studied through orthogonal experiments. The PAE-GTAC structure was identified by means of FTIR and NMR. The effects of the amount of PAE-GTAC , centrifugation time and pH on the removal of Cr^3＋ and dyes（methyl orange、titan yellow and xylenol orange ）were discussed. Under the optimum conditions： reaction temperature 45 ℃,reaction time 5 h and n（PAE（NH2）8）∶n（GTAC）= 1：16,isopropanol as solvent, the yield of PAE-GTAC was 66.28%. At 25℃, pH=8.87, a rotational speed of 3000 r/min for centrifugation 13min with 25mL PAE-GTAC （c=0.01 mol/L） was treated 10mL CrCl3 （c=0.1mol/L） solution, the highest removal rate was 97.56%; at 25℃, pH=1.51、2.03 and 1.52, after oscillated 15min, a rotational speed of 3000 r/min for centrifugation 10min with 25mL PAE-GTAC （c=0.01 mol/L） was treated 10mL dyes （c=1.2×10^-5 mol/L） solution, the highest removal rate of methyl orange, titan yellow and xylenol orange was 84.16%、92.25% and 97.35% respectively.