Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Faculty of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
Carbohydr Polym. 2018 Dec 15;202:306-314. doi: 10.1016/j.carbpol.2018.08.140. Epub 2018 Sep 5.
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, 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、稳定性和可回收性仍然是关键问题。在此，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。多巴胺的自聚合和壳聚糖的凝胶化同时完成，简化了 CS-PDA 气凝胶的合成过程，这对于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优异的吸附性能。吸附等温线和动力学数据均很好地符合朗缪尔和拟二级动力学模型。CS-PDA 对 Cr(VI)和 Pb(II)的最大吸附容量分别为 374.4 和 441.2mg/g。经过 8 次循环，CS-PDA 的吸附容量没有明显下降。这些优越性使得 CS-PDA 成为一种有前途的多功能吸附剂，可用于净化金属离子和染料。
