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Membrane Transport of Pb(II) with a Cooperative Carrier Composed of Dibenzyldiaza‐18‐Crown‐6 and Palmitic Acid
Author(s) -
Kazemi Sayed Yahya
Publication year - 2008
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200800161
Subject(s) - chemistry , thiosulfate , membrane , aqueous solution , masking agent , metal ions in aqueous solution , phase (matter) , inorganic chemistry , ion , aqueous two phase system , metal , ion transporter , selectivity , chloroform , chromatography , organic chemistry , sulfur , catalysis , biochemistry
A chloroform membrane system containing a given mixture of dibenzyldiaza‐18‐crown‐6 and palmetic acid was applied for transport of Pb 2+ ions. The transport was capable of moving metal ions “uphill”. Thus, it was possible to follow the transfer of Pb(II) from the aqueous source phase to the organic layer and from the organic layer to the receiving phase. The effects of thiosulfate concentration in the receiving phase, palmetic acid and dibenzyldiaza‐18‐crown‐6 concentration in the organic phase on the efficiency of the transport system were examined. By using S 2 O 3 2− ion as metal ion acceptor in the receiving phase, the amount of lead ion transport across the liquid membrane after 150 minutes is 96 ± 1.5%. The selectivity and efficiency of lead transport from aqueous solution containing Cu 2+ , Tl + , Ag + , Co 2+ , Ni 2+ , Mg 2+ , Zn 2+ , Hg 2+ , Cd 2+ , Ca 2+ were investigated. In the presence of thiosulfate as a suitable masking agent in the source phase, the interfering effects of Ag + and Cu 2+ were diminished drastically.