Al binding to biomaterial derived from cell wall fragments of the plant Datura innoxia has been investigated using solid-state 27{sup left}Al NMR spectroscopy. Carboxylate groups have been determined to be the responsible functionalities forAl{sup}3+ binding to this material at pH 3.5. The binding of Al{sup}3+ directly to the polysilicate structure of the immobilized biomaterial was also observed. At pH 5.0, direct binding of the Al{sub}13{sup}7+ polymer ion to the biomaterial wasdiscovered. Carboxylate groups were also determined to be involved in the binding of Al{sup}3+ at pH 5.0. The presence of an additional octahedral Al-binding site was also suggested at the higher pH.
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