Chitosan is highly suitable for removing metal ions and dyes from water; however, the sorption performance, stability and recycling are still critical issues in practical applications. Herein, polydopamine-modified-chitosan (CS-PDA) aerogels were synthesized through dopamine self-polymerization and glutaraldehyde cross-linking reactions to enhance the adsorption capacity and acid resistance of chitosan. The self-polymerization of dopamine and gelation of chitosan were accomplished simultaneously, simplifying the synthesis process of CS-PDA aerogels, which is meaningful for the popularization and industrial application of adsorbent. CS-PDA exhibited superior adsorption performances in the removal of Cr(VI), Pb(II) and organic dyes. Adsorption isotherms and kinetic data were well fitted by Langmuir and pseudo-second-order kinetic models. The maximum adsorption capacities of CS-PDA for Cr(VI) and Pb(II) were 374.4 and 441.2 mg g^-1, respectively. After eight cycles, adsorption capacity of CS-PDA showed no obvious decline. These superiorities make CS-PDA a promising multifunctional adsorbent for the purification of metal ions and dyes.

壳聚糖非常适合从水中去除金属离子和染料。然而，在实际应用中，吸附性能，稳定性和回收利用仍然是关键问题。本文中，通过多巴胺自聚合和戊二醛交联反应合成了聚多巴胺改性壳聚糖（CS-PDA）气凝胶，以提高壳聚糖的吸附能力和耐酸性。同时完成多巴胺的自聚合和壳聚糖的凝胶化，简化了CS-PDA气凝胶的合成过程，这对吸附剂的推广和工业应用具有重要意义。CS-PDA在去除Cr（VI），Pb（II）和有机染料方面表现出卓越的吸附性能。吸附等温线和动力学数据通过Langmuir模型和拟二级动力学模型很好地拟合。^-1。经过8个循环后，CS-PDA的吸附量未见明显下降。这些优势使CS-PDA成为用于金属离子和染料纯化的有前途的多功能吸附剂。