TITLE:
Adsorption by Liquid-Liquid Extraction of Hg(II) from Aqueous Solutions Using the 2-Butyl-imidazolium Di-(2-ethylhexyl) Phosphate as Ionic Liquid
AUTHORS:
Mohamed Amine Didi, Baghdad Medjahed, Wafaâ Benaouda
KEYWORDS:
Mercury; Ionic Liquid; Solvent Extraction; Speciation; Butylimidazole; Di-(2-Ethylhexyl) Phosphoric Acid
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.7A,
July
5,
2013
ABSTRACT: In this work, a novel room temperature ionic liquid (2-butyl-imidazolium
di-(2-ethylhexyl) phosphate) ([C4mim] [D2EHPA]) was synthesized and tested as extractant in the
mercury(II) liquid-liquid extraction. The effects of parameters such as aqueous
to organic phase’s volume ratio, metal concentration IL concentration, pH
levels, ionic strength, and temperature were reported. For the extraction of
metal, [C4mim]3[R.HR]3[HgCl2]org and [C4mim]3[R.HR]3 [HgClOH]org species
were formed where (H2R2) was D2EHPA. In
the case of ionic strength, the results showed that the addition of sodium acetate at 0.302 mmol·L?1 to the aqueous phase strongly increased the mercury extraction yield (R = 100%). The
extracted species were investigated by a calculation program using CHEAQS V. L20.1 inorder to determine the relation
between the percentages of the extracted species and the extraction yield. The
results showed that the extracted species in the best conditions were HgCl2 and HgClOH with respective percentages 80.66% and 18.29%.