Abstract：
:The synthesis of chitosan-graft-γ-cyclodextrin (Ch-g-γ-CD) using persulfate/ascorbic acid redox system was done and characterized by FTIR, XRD, TGA and SEM/EDX. The optimum yield of the copolymer was obtained using 16×10(-3) M γ-cyclodextrins (γ-CD), 2.8×10(-2) M ascorbic acid (AA), 1.8×10(-2) M K(2)S(2)O(8) and 0.1g chitosan in 25 mL of 2% aqueous formic acid at 45±0.2°C. The highest percent grafting samples were evaluated for cadmium metal ion (Cd(II)) removal from the aqueous solutions where the sorption capacities were found proportional to the grafting extent. The sorption was pH and concentration dependent where, pH=8.5 was found to be the optimum value. The adsorption data were modeled using Langmuir and Freundlich isotherms. The equilibrium data followed the Langmuir isotherm model with maximum sorption capacity of 833.33 mg/g. The influence of electrolytes, sodium chloride (NaCl) and sodium sulphate (Na(2)SO(4)) on Cd(II) uptake was also studied. Desorption of the cadmium loaded Ch-g-γ-CD was accomplished with 0.01 N H(2)SO(4). The adsorbent exhibited high reusability and could be successfully recycled for nine cycles where in the ninth cycle 27% adsorption was feasible.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Mishra AK,Sharma AKdoi
10.1016/j.ijbiomac.2011.06.002subject
Has Abstractpub_date
2011-11-01 00:00:00pages
504-12issue
4eissn
0141-8130issn
1879-0003pii
S0141-8130(11)00229-7journal_volume
49pub_type
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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