Chitosan, a natural macromolecule, is widely used as a kind of cationic absorbent.It has a good absorbility for anionic dyes from polluted water.

• 壳聚糖是一种用途广泛的天然高分子阳离子型吸附剂，具有吸附分离水溶液中酸性染料的能力。