糠醛渣木质素/聚乙烯亚胺微球的制备

木质素和聚乙烯亚胺（PEI）对重金属离子有良好的亲和力，且木质素来源广泛、具有良好的生物降解性能，在水处理方面有很好的前景。本文以糠醛渣木质素和聚乙烯亚胺为主要原料，十二烷基苯磺酸钠（SDBS）为分散剂，环氧氯丙烷（EPI）为交联剂，液体石蜡为油相，采用反相悬浮聚合法，制备了糠醛渣木质素/PEI微球（LMS）。通过FTIR、XRD、SEM和激光粒度仪对微球的结构和形貌进行表征，研究了木质素用量、PEI用量、EPI用量、SDBS用量、油水比和反应温度对木质素微球制备的影响。结果显示，在木质素用量为0.600g，PEI用量为2.25g，EPI用量为2.25mL，SDBS用量为0.075g，温度为56℃，油水体积比为4.5∶1的条件下，制得的糠醛渣木质素/PEI微球平均粒径为135μm，粒径分散度为0.290，比表面积为46.5m²/g，球型度良好，球体表面有少量微孔。

Preparation of furfural residue lignin/poluethyleneimine microspheres

Lignin and polyethyleneimine (PEI) have good affinity for heavy metal ions, and lignin sources have a wide range of good biodegradability and good prospects in water treatment. The furfural residue lignin/PEI microspheres (LMS) were prepared with furfural residue lignin and polyethyleneimine by inverse suspension polymerization, which epichlorohydrin (EPI) was used as crosslinked agent, sodium dodecylbenzenesulfonate(SDBS) was of dispersing agent, and liquid paraffin was the oil phase. The structure and morphology of the microspheres were characterized by FTIR, XRD, SEM and laser particle size analyzer. The amount of lignin, the amount of PEI, the amount of crosslinker, the amount of dispersant, the ratio of oil to water and the reaction temperature were studied for lignin micro. The results showed that the optimal conditions for furfural lignin/PEI microspheres preparation were lignin dosages of 0.600g, PEI dosage of 2.25g, EPI dosage of 2.25mL, SDBS dosage of 0.075g, reaction temperature of 56℃, and oil to water volume ratio of 4.5∶1. The obtained lignin microspheres had good spherical shape, uniform particle size, a small amount of potholes on the surface of the sphere and a specific surface area of 46.5m²/g. The average particle diameter was 135μm with uniformity of 0.290.