期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 181, 期 -, 页码 778-785出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.03.166
关键词
Polyamine-co-melamine; Chitosan; Hg2+ adsorption
资金
- National College Students Innovation and Entrepreneurship Training Program, China
The modified chitosan with polyamine compounds and melamine derivatives showed enhanced adsorption capacity for Hg2+ ions, reaching equilibrium within 12 hours. The Langmuir model fitted best for the adsorption isotherm, with high adsorption capacities of 1403 and 109.7 mg/g for MCS-4N and MCS-5N, respectively, indicating potential for practical applications in removing Hg ions from aqueous solutions and polluted waters.
A batch experiment was carried out in order to remove Hg2+ from the aqueous solution as well as the polluted water using modified chitosan (CS) with polyamine compounds (triethylenetetramine (TETA), tetraethylenepentamine (TEPA)), and melamine. The obtained polyamine-co-melamine crosslinked CS derivatives (MCS-4N and MCS-5N) were characterized and used as adsorbents. In comparison to the raw CS, the modification significantly promoted the adsorption of Hg(2+ )ions. The results of the pseudo-second-order kinetic model revealed that pH-dependent derivatives adsorbents achieved the equilibrium state within 12 h. The Langmuir model was best fitted with the Hg2+ adsorption isotherm and showed the highest adsorption capacities of 1403 and 109.7 mg/g for MCS-4N and MCS-5N, respectively. A slight decrease in the adsorption efficiency of Hg 2 divided by was noticed with the increment of the ionic strength of the solution. However, the studied adsorbents were easily regenerated and presented adequate reusability. The Hg2+ adsorption was regulated by the combined process of coordination reaction and electrostatic attraction as well. The as-prepared polyamine-co-melamine crosslinked CS derivatives were found potential adsorbents for the adsorptive capture of H ions from aqueous solutions and polluted waters. (C) 2021 Elsevier B.V. All rights reserved.
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