Synthesis of Salicylideneamino-2-thiophenol Immobilized Glass Beads and Their Application to a Preconcentration of Trace Aluminum

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Chelating glass beads (SAB) containing salicylideneamino-2-thiophenol (SATP) as a functional group were synthesized for the selective adsorption and separation of ionic aluminum (Al³⁺). SAB was prepared by reacting amino-propyl-CPG (controlled pore glass) with SATP, shielded from light in toluene at 110°C for 12 h. The exchange capacity of SAB for Al³⁺ was about 1.1 mmol/g (support). When SAB was packed into a column, only Al³⁺ was retained out of all the metal ions examined, at pH 5.5 with hydroxylamine hydrochloride present. Aluminum ion was then eluted quantitatively with nitric acid. Aluminum samples below 1 ppm were concentrated by a factor of 100. This column method applied to the preconcentration of Al³⁺ in drinking water.