Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 86, Issue -, Pages 562-569Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2016.01.100
Keywords
Chitosan; Cross-linking; Ion-imprinting; Lead; Selective adsorption
Funding
- National Natural Science Foundation of China [31302162]
- China Postdoctoral Science Foundation [2013M531652]
- National Science and Technology Plan Project of China [2012AA101607-2]
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In this paper, the bio-based ion-imprinted tetraethylenepentamine (TEPA) modified chitosan beads using Pb(II) as imprinted ions (Pb-ITMCB) were chemically synthesized, characterized and applied to selectively adsorb Pb(II) ions from aqueous solutions containing other metal ions, which has the same concentration as that of Pb(II) ions. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity and reusability. FTIR, SEM and TEM technologies were used to elucidate the mechanism of Pb-ITMCB adsorbing Pb(II) ions. The results showed that the adsorption capacity of Pb-ITMCB for Pb(II) ions reached 259.68 mgig at pH 6, 40 degrees C. The adsorption data could be fitted well with pseudo second order kinetics model and Langmuir isotherm model. Compared with other metal cations, Pb(II) ions showed an overall affinity of being adsorbed by Pb-ITMCB. With the participation of active groups including -NH2, -NH and -OH, the adsorption reaction took place both inside and on the surface of Pb-ITMCB. It indicated that Pb-ITMCB is a comparatively promising biosorbent for selective removal of Pb(II) ions from aqueous solutions. (C) 2016 Elsevier B.V. All rights reserved.
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