TY - JOUR
T1 - Separation properties of surface modified silica supported liquid membranes for divalent metal removal/recovery
AU - Cooper, C. A.
AU - Lin, Y. S.
AU - Gonzalez, M.
N1 - Funding Information:
The authors would like to acknowledge the National Risk Management Research Laboratories Division of the US EPA for funding of this research.
PY - 2004/2/1
Y1 - 2004/2/1
N2 - 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 an α-alumina support, modified with dichlorodimethyl silane (DCDMS) to add surface methyl groups to the silica layer. 2-Hydroxy-5-nonylacetophenome oxime (LIX-84) was entrapped within 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 two-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, and 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 2.3×10-10mol/cm2s (with 40mmol/L (40ppm) Cu 2+ feed) and permeability coefficients as high as 8.0×10 -4cm/s were obtained for these mesoporous inorganic SLMs.
AB - 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 an α-alumina support, modified with dichlorodimethyl silane (DCDMS) to add surface methyl groups to the silica layer. 2-Hydroxy-5-nonylacetophenome oxime (LIX-84) was entrapped within 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 two-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, and 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 2.3×10-10mol/cm2s (with 40mmol/L (40ppm) Cu 2+ feed) and permeability coefficients as high as 8.0×10 -4cm/s were obtained for these mesoporous inorganic SLMs.
KW - Concentration gradient
KW - Divalent metal removal
KW - Liquid membranes
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U2 - 10.1016/j.memsci.2003.09.023
DO - 10.1016/j.memsci.2003.09.023
M3 - Article
AN - SCOPUS:0347091862
SN - 0376-7388
VL - 229
SP - 11
EP - 25
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
IS - 1-2
ER -