Highly selective transport of mercury(II) ion through a bulk liquid membrane

Abstract

Recebido em 25/3/08; aceito em 8/8/08; publicado na web em 18/12/08In this work carrier-facilitated transport of mercury(II) against its concentration gradient from aqueous 0.04 M hydrochloric acid solution across a liquid membrane containing isopropyl 2-[(isopropoxycarbothiolyl)disulfanyl]ethane thioate (IIDE) as the mobile carrier in chloroform has been investigated. Sodium thiocyanate solution (1.6 M) was the most efficient receiving phase agent among several aqueous reagents tested. Various parameters such as investigated. Under optimum conditions the transport of Hg(II) across the liquid membrane is more than 97% after 2.5 h. The carrier, IIDE, selectively and efficiently could able to transport Hg (II) ions in the presence of other associated metal ions in binary systems.Keywords: bulk liquid membrane; mercury (II) ion; isopropyl 2-[(isopropoxycarbothiolyl)disulfanyl]ethane thioate.

Biosorptive removal of mercury(II) from aqueous solution using lichen (Xanthoparmelia conspersa) biomass: Kinetic and equilibrium studies

“…The batch studies were performed at different experimental conditions such as initial metal concentration (10-400 mg/L), contact time (5-120 min), pH (2)(3)(4)(5)(6)(7)(8), biomass concentration (0.4-16 g/L), and temperature (20-50 • C). The equilibrium time was estimated by drawing samples at regular intervals of time till equilibrium was reached.…”

“…Mercury is a pervasive contaminant that is highly toxic and is readily accumulated by organisms [2,3]. The major effects of mercury poisoning are neurological and renal disturbances as well as impairment of pulmonary function [4].…”

Removal of mercury(II) from aqueous solution using moss (Drepanocladus revolvens) biomass: Equilibrium, thermodynamic and kinetic studies

“…The batch studies were performed at different experimental conditions, such as initial metal concentration (10-400 mg L −1 ), contact time (5-120 min), pH (2)(3)(4)(5)(6)(7)(8), biomass concentration (0.4-16 g L −1 ), and temperature (20-50 • C). The equilibrium time was estimated by drawing samples at regular intervals of time till equilibrium was reached.…”

“…7. The linear form of the D-R isotherm equation [47] is ln q e = ln q m −ˇε 2 (4) where q e is the amount of metal ions sorbed on per unit weight of biomass (mol g −1 ), q m is the maximum biosorption capacity (mol g −1 ),ˇis the activity coefficient related to biosorption mean free energy (mol 2 J −2 ) and ε is the Polanyi potential (ε = RT ln(1 + 1/C e )).…”

“…Mercury has very high tendency for binding to proteins and it mainly affects the renal and nervous systems [4]. In humans, the initial symptoms include numbness of the lips and limbs.…”