阳离子落叶松单宁絮凝剂的制备及表征

Preparation and Characterization of Cationic Flocculant of Larch Tannin

以落叶松单宁为原料,通过接枝聚合反应合成了阳离子絮凝剂(TAD)——落叶松单宁-丙烯酰胺-二甲基二烯丙基氯化铵,探讨了引发剂浓度、单体用量等因素对合成产物接枝率、转化率以及对酸性黑ATT染料脱色率的影响,采用FTIR、HPLC、EA以及SEM测定了TAD的化学结构和微观聚集形态。确定了合成TAD的较佳条件:引发剂浓度为0.01mol/L,落叶松单宁对丙烯酰胺和二甲基二烯丙基氯化铵的质量比为1:3:3,反应时间4h,反应温度50℃。此条件下对0.1g/L酸性黑ATT染料的脱色率为42.85%,当TAD与聚合氯化铝以质量比1:1复配使用处理0.1g/L酸性黑ATT水样时,脱色率可达89.58%,在实际应用上TAD更适合与无机水处理剂复配使用。

Cationic flocculant （TAD） was synthesized through graft polymerization using larch tannin as experimental material. The effects of initiator concentration and monomer dosage were discussed on the graft rate and transformation rate of the synthesized product and its decolorization rate to acid black ATT dye. Chemical structure and micro - morphological characteristics of TAD was studied by FTIR, HPLC, EA, and SEM. The optimal synthetic conditions for TAD were obtained as initiator concentration 0.01 mol/L, mass ratio of carboxymethyl larch tannin to acrylamide and dially dimethy ammonium chloride 1：3： 3, reaction time four hours, and reaction temperature 50 degrees C. The decolorization rate of acid black ATT dye was 42.85 percent under the optimal conditions. When using TAD combined with PAC in a mass ratio of 1 ： 1 to deal with ATT water solution, the decolorization rate reached 89.58 percent. In practical application, TAD is suitable to be used with inorganic water treatment agent to obtain a preferable effect of flocculant.