Liquid–liquid extraction of Hg(II) from acidic chloride solutions using bis‐2‐ethylhexyl sulfoxide

Abstract

The liquid±liquid extraction of Hg(II) from acidic chloride solutions has been studied using bis-2-ethylhexyl sulfoxide (B2EHSO) as an extractant. For comparison, extraction studies have also been carried out using di-n-octyl sulfoxide (DOSO) and diphenyl sulfoxide (DPhSO). The extraction data have been analysed by both graphical and theoretical methods taking into account aqueous phase speciation and all plausible complexes extracted into the organic phase. These results demonstrate that Hg(II) is extracted into xylene as HgCl 2 .3R 2 SO (where R 2 SO represents the sulfoxide). The equilibrium constant of the extracted complex has been deduced by non-linear regression analysis. The developed liquid±liquid extraction procedure has been applied for the recovery of mercury from the brine-sludge of a Chlor-Alkali plant.

Facilitated transport of phenol through supported liquid membrane containing bis(2-ethylhexyl) sulfoxide (BESO) as the carrier

“…Dialkyl sulfoxides (R 2 SO) containing S¼O groups, which are similar to the P¼O groups in organophosphorus compounds, have gained importance as potential extracting agents for various metals because of their excellent extractive power and chemical and radiative stability [24]. A large amount of research has been undertaken to recover various heavy metals such as mercury [24], uranium [25], rare-earth metals [26], and platinum-group metals [27], using sulfoxides as extractants.…”

“…A large amount of research has been undertaken to recover various heavy metals such as mercury [24], uranium [25], rare-earth metals [26], and platinum-group metals [27], using sulfoxides as extractants. Bis(2-ethylhexyl) sulfoxide (BESO, Fig.…”

Hg (II) extraction in a PEG-based aqueous two-phase system in the presence of halide ions. I. Liquid phase analysis

“…In general, metal ions are extracted from aqueous solutions into organic solvents (water-immiscible) by using a suitable extracting agent [2][3][4]. However, most of the solvents employed are toxic, inflammable, volatile and have caused environmental problems.…”

Speciation of heavy metals in the surface waters of a former tin mining catchment

“…For analysis of chemical speciation, different methods have been employed by different researchers such as voltammetry (Bard and Faulkner, 1980;Bond, 1980), liquid -liquid extraction (Meera et al, 2001;Francis et al, 2001), ion exchange and adsorption columnsyresins (Morel et al, 2008;Sweileh et al, 1987), gas chromatography (Dietz et al, 2000;Rodil et al, 2002), liquid chromatography (Ibrahim et al, 1984;Weber et al, 2002), capillary electrophoresis (CE) (Rocha et al, 2000;Yin et al, 2002) as well as inductively coupled plasma mass spectrometry (ICP-MS) (Medel et al, 2003;Butcher, 2007). ICP-MS could be useful tool for sensitive speciation analyses of many environmentally important elements.…”