期刊
CARBOHYDRATE POLYMERS
卷 202, 期 -, 页码 306-314出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.08.140
关键词
Aerogels; Chitosan; PDA; Heavy metal ions; Adsorption; Dyes
资金
- National Natural Science Foundation of China [21676039]
- State Key Laboratory of Bio-Fibers and Eco-Textiles [2017kfkt12]
- Innovative talents in Liaoning universities and colleges [LR2017045]
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.
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