以壳聚糖（CS）、丙烯酰胺（AM）和甲基丙烯酰胺丙基三甲基氯化铵（MAPTAC）为原料，通过低压紫外引发接枝共聚合成壳聚糖基阳离子絮凝剂CS-g-P（AM-MAPTAC），并用于石油污水乳化油的脱除。利用FT-IR、HNMR、SEM等对CS和CS-g-P（AM-MAPTAC）进行表征。结果表明，CS-g-P（AM-MAPTAC）的接枝率可控，其最佳制备条件为：光引发剂质量分数为0.3%、总单体质量分数为7.5%、单体质量比为25%、总单体与壳聚糖质量比为4、光照时间为120 min。同时，考察了絮凝剂用量、pH、初始油质量浓度和接枝率对CS-g-P（AM-MAPTAC）絮凝性能的影响。结果表明，与CS和市售阳离子聚丙烯酰胺（CPAM）相比，CS-g-P（AM-MAPTAC）具有更优异的絮凝性能，在初始油质量浓度为550~2 200 mg/L和pH为6~10时，除油率达到95%，表现出更宽絮凝窗口。

CS-g-P(AM-MAPTAC),a chitosan-based cationic flocculant,is synthesized through low-pressure UV-initiated grafting polymerization with chitosan,acrylamide (AM) and methacrylamido propyl trimethyl ammonium chloride (MAPTAC) as raw materials,and used to remove emulsified oil in petroleum wastewater.FT-IR,¹HNMR and SEM are employed to characterize the structures of chitosan and CS-g-P(AM-MAPTAC).Results show that the grafting ratio of CS-g-P(AM-MAPTAC) is controllable.The optimal synthesis conditions are as follows:the mass fraction of photo-initiator is 0.3%,total monomer mass fraction is 7.5%,the mass ratio between two monomers is 25%,the mass ratio of total monomer to chitosan is 4,and illumination spends for 120 min.Effects of flocculant dosage,pH value,initial oil mass concentration and grafting ratio on the flocculation performance of CS-g-P(AM-MAPTAC) are studied.The results show that compared with chitosan and commercially available cationic polyacrylamide (CPAM),CS-g-P(AM-MAPTAC) exhibits better flocculation performance.The removal ratio of oil over CS-g-P(AM-MAPTAC) reaches 95% when initial oil mass concentration is 550-2 200 mg·L^-1 and pH is in the range of 6-10,showing a wide flocculation window.

廖彬伶(1995-),女,硕士研究生,研究方向为石油加工,liaobinling@163.com