复合混凝剂的制备及活性染料的去除

以马铃薯淀粉、丙烯酰胺（AM）和二甲基二烯丙基氯化铵（DADMAC）为原料进行接枝反应,将接枝产物（TSI）与聚合氯化铝铁（PAFC）复配,制得新型复合混凝剂PAFC-TS1。优化了复合混凝剂制备的工艺条件。研究结果表明,复合混凝剂PAFC-TS1的优选制备条件为：OH^-浓度与铝铁总浓度的比（r）为0.5,铝铁总浓度与TS1的质量浓度比（R_m）为0.5 mol/g,铝铁摩尔比9∶1。在此条件下处理质量浓度为100 mg/L的活性染料废水,当混凝剂投加量为24 mL/L时,染料去除率可达97%以上。相同条件下,使用PAFC-TS1比单独使用PAFC或PAFC-PAM的染料去除率更高。

Preparation of composite coagulant and removal of reactive dye

A novel composite coagulant,PAFC-TS1,was prepared by mixing poly-aluminum ferric chloride（PAFC）and grafting product（TSI）of potato starch modified by acrylamide（AM）and dimethyl diallyl ammonium chloride（DADMAC）. The preparation conditions were optimized. The results show that the optimal preparation conditions are as follows：the ratio of OH- concentration to total Al and Fe concentration（r）0.5,the ratio of total Al and Fe concentration to TS1 mass concentration（R_m ）0.5 mol/g,and the mole ratio of Al to Fe 9∶1. The reactive dye wastewater with 100 mg/L of mass concentration was treated under these conditions and when the PAFC-TS1 coagulant dosage was 24 mL/L,the dye removal rate reached over 97%,which was higher than those by using PAFC only or PAFC-PAM.