Abstract
Facilitated transport of silver(I) cation across a bulk liquid membrane by two synthesized ligands, bis-β-enamino ester (BBEE) and bis(benzoic acid) trioxaheptane (BBAT), as carriers dissolved in dichloromethane has been investigated. BBEE was used as a specific ion carrier for the transport of silver(I) ion. The influence of experimental parameters affecting the transport efficiency of silver(I) ion have been studied. In the presence of thiosulfate as a suitable metal ion acceptor in the receiving phase and picrate ion as ion pairing agent in the source phase, the amount of silver(I) ion transported across the liquid membrane after 120 min was found to be 97%. Tolerance to the presence of different ions was investigated and it was found that silver(I) cation transport was not affected even in the presence of 10-fold concentration of these metal cations in solution. This system was applied for the recovery of silver(I) cation from silver plating and photographic waste solution.
Highlights
It is reported that the concentration of silver(I) cation in water higher than 0.17 μg L-1 is toxic to fish and microorganisms
We report the results of a selective and efficient bulk liquid membrane system containing bis-β-enamino ester (BBEE) as a synthesized carrier for transport of silver(I) ion
The quantitative transport of Ag+ ion through a dichloromethane bulk liquid membrane containing bis-βenamino ester (BBEE) as a carrier was studied and it was found that this ligand is an excellent carrier for selective and efficient transport of silver(I) cation
Summary
Silver is an important element that is mainly used in photographic and imaging industry, dental and medical products, electrical and electronic equipment and other products like jewelry, coins, and mirrors.[1,2,3,4] It is an important ion in some drugs like silver sulfadiazine cream that has been a standard treatment for burns over the past decades and silver deposition has been found in the skin, gingiva, cornea, liver, and kidney of patients.[5,6] It is reported that the concentration of silver(I) cation in water higher than 0.17 μg L-1 is toxic to fish and microorganisms. It has been found that silver is toxic to humans at a concentration as high as 97.2 μg L-1 in drinking water.[7,8,9,10] On the other hand, owing to the fact that Ag+ has moderate coordination ability, it is quite difficult to be discriminated from other chemically similar toxic elements. Separation and recovery of silver from waste and industrial sources are environmentally and economic important
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
