Synthetischer Crandallit |
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| Authors: | E Besold D Bieniek A Kettrup |
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| Institution: | 1. GSF- Forschungszentrum für Umwelt und Gesundheit GmbH, Institut für ?kologische Chemie, Ingolst?dter Landstr. 1, D-W-8042, Neuherberg
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| Abstract: | Crandallite (Ca,Sr) Al3 (PO4)2 (OH)5 · H2O crystallizes in the alunitecrystal lattice. Because of its open structure, the cations Ca2+, Sr2+, and Al3+ can be replaced by various elements depending on their diadochial properties; the element entering into the crystal network thus becomes immobilized. Artificial amorphous crandallite has been shown to eliminate the heavy metal ions: Pb2+>>Cu2+>Hg2+>>Cd2+ from contamined water in the presence of lateritic phosphates. Pb2+ could be removed nearly quantitatively in all cases. |
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