Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579612 | Journal of Hazardous Materials | 2011 | 8 Pages |
Abstract
Highly porous chitosan (CS) monoliths were prepared by a unidirectional freeze-drying method and the adsorption performance of the monoliths for metal ions in aqueous solution was evaluated. The porous CS monoliths have excellent adsorption for a range of metal ions. The effect of the amount of porous CS monoliths, the pH, the adsorption time, the amount of the cross-linking agent, and the amount of disodium ethylenediamine tetraacetate (EDTA) on the saturated adsorption efficiency (Ade) were determined. The pH had the greatest influence on the adsorption behavior. Under optimal conditions (CCu2+=800mg/L, pH 6, and cross-linking agent = 0.15%) for the CS monoliths, the Ade for Cu2+ exceeded 99%, and the saturated adsorption capacity (Qs) reached a value of 141.8 mg/g (2.23 mmol/g) in 4 h. Moreover, the addition of EDTA can both increase the Qs and shorten the time that achieved the level. If EDTA was added, this level was achieved in 2 h. The porous CS monoliths can be regenerated by soaking them in acid and their Ade is maintained.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Fangqiang Xu, Nana Zhang, Ying Long, Youmiao Si, Yu Liu, Xue Mi, Xiaodong Wang, Fubao Xing, Xiudong You, Jianping Gao,