Sorption sites in dried leaves

摘要

We report on the biosorption of copper ions in dried 'eaves from the Brazilian flora. By Electron Paramagnetic Resonance &PR) it is shown that the copper ions are incorporated in the leaves in a strongly axial site. Washing with an acidic solution does not remove the copper from the leaves, but does modify the axial site symmetry. Inftared absorption seems to be compatible with a site which is located near to a simple or a double carbon - oxygen bond. Dried leaves are a good and commercially interesting alternative for sorption of metal ions compared to other biomasses.