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Title: Selective pertraction of Pd (II) across a solid supported liquid membrane using thiamacrocycle S6-pentano-36 as an ionophore
Authors: Shukla, J P
Sawant, S R
Kumar, Anil
Singh, R K
Issue Date: May-1996
Publisher: NISCAIR-CSIR, India
Abstract: Thiamacrocycle-facilitated co-transport of Pd (II) from dilute nitrateĀ· acidic solutions has been examined across solid supported liquid membrane (SSLM) deploying S6-P-36 as the novel ionosphere. Under the optimum conditions, micro amounts of palladium could be effectively transported from a feed (1 M HNO3) solution across an organic thiacrown membrane into the product side containing strip-pants like 2 M NH4SCN. Its concentration in the source phase decreased as [Pd]f,t= [Pd]f,o exp(-Kobs t). The apparent rate constant (Kobs) increased with increasing carrier concentration and became nearly constant above 0.02 M S6-Pentano-36. With increase in nitric acid concentration from 0.1 to 5 MHNO3, Kobs decreased. A polytetrafluroethylene thin film support coded as TE-35 and toluene as membrane solvent were invariably used. Among the several reagents tested, ammonium thiocyanate served most efficiently as the strippant. More than 95% of palladium could be readily transported from diverse matrices through 0.05 S6-Pentano-36 into dilute aqueous ammonium thiocyanate strippant in about 6-7 h.
Page(s): 152-155
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.03(3) [May 1996]

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