Role of pH in metal adsorption from aqueous solutions containing chelating agents on chitosan
- Lien Ho Junior Coll. of Technology, Maio-Li (Taiwan, Province of China). Dept. of Chemical Engineering and Environmental Engineering
- Yuan Ze Univ., Chung-li (Taiwan, Province of China)
The role of pH in adsorption of Cu(II) from aqueous solutions containing chelating agents on chitosan was emphasized. Four chelating agents including ethylenediaminetetraacetic acid (EDTA), citric acid, tartaric acid, and sodium gluconate were used. It was shown that the adsorption ability of Cu(II) on chitosan from its chelated solutions varied significantly with pH variations. The competition between coordination of Cu(II) with unprotonated chitosan and electrostatic interaction of the Cu(II) chelates with protonated chitosan took place because of the change in solution pH during adsorption. The maximum adsorption capacity was obtained within each optimal pH range determined from titration curves of the chelated solutions. Coordination of Cu(II) with the unprotonated chitosan was found to dominate at pH below such an optimal pH value.
- OSTI ID:
- 316372
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 38, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Removal of copper(II) chelates of EDTA and NTA from dilute aqueous solutions by membrane filtration
Dissolution of metal oxides accumulated in nuclear steam generators: study of solutions containing organic chelating agents