Abstract
Chitosan synthesized locally with a degree of deacetylation 71% and chitosan with a degree of deacetylation 68% from Sigma Aldrich were used to investigate adsorption of Cu2+ ion in aqueous solution. The results obtained from equilibrium isotherm adsorption studies of Cu2+ ion were an-alyzed in five adsorption models namely: Langmuir, Freundlich, Temkin, Elovich and Dubin- Ra-dushkevich. The isotherms equation was indicated to be well fitted to Langmuir, Freundlich, Temkin and Elovich under the concentration range studied. The kinetic parameters were evaluated utilizing the pseudo-first-order and pseudo-second-order equations, and the adsorption kinetics followed the mechanism of the pseudo-second-order equation for all systems studied, evidencing chemical sorption as the rate-limiting step of adsorption mechanism and not involving a mass transfer in solution. The FTIR studies revealed that the greater sorption of heavy metal was attributed to the large number of primary amine groups available on the surfaces of the chitosan and the abundant carboxyl groups on chitosan.
Highlights
The presence of heavy metal ions in the environment has received extensive attention due to their increasing release to the atmosphere
= qe KF ⋅ Ce1 n where Ce is the equilibrium concentration of metal ion, qe is the amount of metal ion adsorbed on adsorbent mass unit, KF is the maximum adsorption capacity of metal ions and n is a constant present in non linear-Freundlich isotherm which indicated the adsorption intensity
Chitosan with a degree of deacetylation about approximately 70% was obtained from Sigma Aldrich Germany, Sodium hydroxide (NaOH), Hydrochloric acid (HCl) and copper (II) suplhate pentahydrate all reagent used were of analytical grade
Summary
The presence of heavy metal ions in the environment has received extensive attention due to their increasing release to the atmosphere. Chitosan has drawn particular attention as effective biosorbent due to its low cost compared with activated carbon and its high contents of amino and hydroxyl functional groups showing high adsorption potential for various aquatic pollutants. This biopolymer represents an attractive alternative to other biomaterials because of its physico-chemical properties, chemical stability, high reactivity, excellent chelation behavior and high selectivity toward pollutants [1]. The adsorption ability of chitin or chitosan to sorb Cu(II) ions from aqueous solutions was studied, taking kinetic, equilibrium and mass transfer aspects into account [13]
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