By increasing the number of subchain and length, the high molecule flocculant with higher efficient (VCG) was prepared by chitosan with vanillic aldehyde, and the best condition was determined.

• 利用壳聚糖与香草醛之间的希夫碱反应,对壳聚糖的分子进行修饰,增加其支链数目与长度,制备出更为高效的天然高分子絮凝剂VCG,并初步确定了反应条件。