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SEPARATION PROPERTIES OF SURFACE MODIFIED SILICA SUPPORTED LIQUID MEMBRANES FOR DIVALENT METAL REMOVAL/RECOVERY
Citation:
Cooper, C., Y. Lin, AND M A. Gonzalez*. SEPARATION PROPERTIES OF SURFACE MODIFIED SILICA SUPPORTED LIQUID MEMBRANES FOR DIVALENT METAL REMOVAL/RECOVERY. JOURNAL OF MEMBRANE SCIENCE. Elsevier Science BV, Amsterdam, Netherlands, 229(1):11-25, (2004).
Description:
The synthesis and separation properties of a mesoporous silica supported liquid membrane (SLM) were studied. The membranes consisted of a silica layer, from dip-coated colloidal silica, on a a-alumina support, modified with DCDMS (dichlorodimethyl silane) to add surface methyl groups to the silica layer. LIX-84 (2-hydroxy-5-nonylacetophenone oxime) was entrapped withing the pores of the silica due to hydrophobic interactions between the surface methyl groups and the long hydrocarbon chain from the LIX-84. The goal of synthesizing the membrane in this manner was to enhance the stability of SLMs. The membranes made after 2-time dip-coating demonstrated good stability (no sign of LIX loss after 12 days) and uphill Cu2+ transport against the concentration gradient. Regardless of operating conditions, of the six metals studied (Ca, Cd, Cu, Pb, Zn & Ni) only Cu2+ showed any flux except for some experiments in which Ca2+ flux could be attributed to imperfections in the membrane. Cu2+ fluxes as high as 2.3 x 10-10 moles/cm2s (with 40 ppm Cu2+ feed) and permeability coefficients as high as 8.0 x 10-4 cm/s were obtained for these mesoporous inorganic SLMs.