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SYNTHESIS AND CHARACTERIZATION OF LIX-84 NON-COVALENTLY BOUND SILICA SORBENTS FOR METAL-ION RECOVERY
Citation:
Cooper, C., Lin, J. (Y.S.), AND M A. Gonzalez*. SYNTHESIS AND CHARACTERIZATION OF LIX-84 NON-COVALENTLY BOUND SILICA SORBENTS FOR METAL-ION RECOVERY. Paul, D.R. (ed.), INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. American Chemical Society, Washington, DC, 42(6):1253-1260, (2003).
Description:
Mesoporous silica particles were modified with LIX-84: (2-hydroxy-5-nonylacetophenome oxime). The LIX-84: was attached to the surface of silica via non-covelent forces. The effects of silica particle size, temperature, and pH on metal ion adsorption properties were studied and compared to metal ion adsorption properties for chelating groups covalently bound to the surface of silica. The adsorbent had a capacity of 0.6 mmol Cu++/g adsorbent at room temperature and a capacity of 1.1 mmol Cu++/g adsorbent at 60oC. Depending on the solution pH the adsorbent had varying capacity for copper(2+), nickel(2+), and lead(2+). The adsorbent was found to have excellent stability and gave high metal recovery when regenerated with 2 vol.% nitric acid. The silica was found to contain from 5-7 wt.% by weight LIX-84.