Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 17, Pages 7954-7958Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.04.001
Keywords
adsorption; Cu2+; nylon-based membrane; adsorption model
Funding
- National Science Foundation of China [50773009]
- Changjiang Scholars and Innovative Research Team in University [IRT0526]
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A novel activated nylon-based membrane was prepared and applied as an adsorbent for the removal of Cu2+ from aqueous solutions. It involved three stages: (i) deposition of a chitosan layer that functionalized the nylon membrane, (ii) cross-linking with epichlorohydrin to stabilize the polymer layer and enabling grafting, and (iii) iminodiacetic acid grafting. SEM and EDX techniques were used to characterize the composition of the membranes. Dynamic adsorption experiments on membranes were carried out at various pH values, contact times, adsorption dosages and initial metal concentrations to determine optimum membrane adsorption properties. The adsorption isotherm relating to Cu2+ fitted the Langmuir equation and an adsorption equilibrium constant and adsorption capacity of 2.345 x 10(-3) mg/ml and 10.794 mg/g were determined, respectively. The experimental data was analyzed using two adsorption kinetic models, pseudo-first-order and pseudo-second-order with the latter system providing the best fit. Finally complete regeneration of the activated nylon membrane was possible using 100 mmol/l Na(2)EDTA. (C) 2008 Elsevier Ltd. All rights reserved.
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