Abstract
Sorption of higher concentrations of Cu(II) solution onto natural sheep wool or wool irradiated by an electron beam was studied. Sorption isotherms were of unexpected character, showing extremes. The samples with lower absorbed doses adsorbed less than non-irradiated wool, while higher doses led to increased sorption varying with both concentration and dose. FTIR spectra taken from the fibre surface and bulk were different. It was concluded that there was formation of Cu(II)-complexes of carboxylic and cysteic acids with ligands coming from various keratin macromolecules. Clusters of chains crosslinked through the ligands on the surface limit diffusion of Cu(II) into the bulk of fibre, thus decreasing the sorption. After exhausting the available ligands on the surface the remaining Cu(II) cations diffuse into the keratin bulk. Here, depending on accessibility of suitable ligands, Cu(II) creates simple or complex salts giving rise to the sorption extremes. Suggestion of a mechanism for this phenomenon is presented.
Highlights
Many biopolymers find use in separative technology as adsorbents of either plant [1,2,3,4,5] or animal origin [6,7,8,9,10,11,12]
As regards adsorbents based on animal products, the most frequently mentioned are sheep wool or colloidal keratin, as well as chitosan
Since wool modified with electron beam, as a novel adsorbent, has been investigated relatively little, in this work we have focused on the sorption of Cu(II) cation onto such treated wool applying higher Cu(II) concentrations and trying to understand the relevant sorption mechanism
Summary
Many biopolymers find use in separative technology as adsorbents of either plant [1,2,3,4,5] or animal origin [6,7,8,9,10,11,12]. Both groups of biopolymeric adsorbents have been obtained from waste material after being treated using some suitable modifying techniques of chemical or physical character. In a subsequent work [7] similar adsorbents were used to examine the sorption of some divalent metal cations such as
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