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Biosorption Mechanism for Anionic Metal
Species with Waste Crab Shells Biosorption
of anionic metal species such as gold-cyanide, chromate and anionic vanadate species by
acid-washed Ucides shells (AWUS) mainly involved anions binding on the positively charged
amide groups of the AWUS. The binding force may relate to electrostatic attraction. No
significant reduction of the selected metals was observed in the biosorption systems with
AWUS. All selected metals were observed bound on AWUS at their respective original valent
states, i.e. Au(I), Cr(VI) and V(V). Anionic metal species biosorption takes place through
a combination of ion-exchange and adsorption. In the case of vanadate, the binding
mechanism might involve other mechanism(s) in addition to the above ones. |
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