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http://dx.doi.org/10.12989/mwt.2016.7.6.555

Adsorption mechanism of copper ions on porous chitosan membranes: Equilibrium and XPS study  

Ghaee, Azadeh (Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran)
Zerafat, Mohammad Mahdi (Faculty of Advanced Technologies, Nano Chemical Engineering Department, Shiraz University)
Publication Information
Membrane and Water Treatment / v.7, no.6, 2016 , pp. 555-571 More about this Journal
Abstract
Heavy metal contamination has attracted considerable attention during recent decades due to the potential risk brought about for human beings and the environment. Several adsorbent materials are utilized for the purification of contaminated water resources among which chitosan is considered as an appropriate alternative. Copper is a heavy metal contaminants found in several industrial wastewaters and its adsorption on porous and macroporous chitosan membranes is investigated in this study. Membranes are prepared by phase inversion and particulate leaching method and their morphology is characterized using SEM analysis. Batch adsorption experiments are performed and it is found that copper adsorption on macroporous chitosan membrane is higher than porous membrane. The iso-steric heat of adsorption was determined by analyzing the variations of temperature to investigate its effect on adsorption characteristics of macroporous chitosan membranes. Furthermore, desorption experiments were studied using NaCl and EDTA as eluants. The mechanism of copper adsorption was also investigated using XPS spectroscopy which confirms simultaneous occurrence of chelation and electrostatic adsorption mechanisms.
Keywords
macroporous chitosan membrane; adsorption; desorption; isotherm; XPS study;
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