This article reports the extraction of Hg(II), Cd(II) and Cr(III) ions from acidic media using new supported liquid membranes (SLM). The novelty of this work is the use of an ionic liquid (IL) (isooctylmethylimidazolium bis-2-ethylhexylphosphate) as carrier for the SLM. The ionic liquid was synthesized under microwave and characterized (volumetric mass density, viscosity and thermal stability). The influences of the membrane support hydrophobicity and of the operating conditions (carrier concentration, metallic ions nature and concentration, acidity of the aqueous phases and temperature) were studied. Fluxes, permeability, diffusion coefficients and association constants were determined by kinetic studies. The SLM appeared more suitable for the extraction of Cd(II) ions at pH = 3 (higher permeability coefficient: 40.3 × 10⁻⁷ cm² s⁻¹, extraction ratio: 35% after 4 h run; selectivity coefficients: α_{Cd(II)/Hg(II)} = 1.8 and α_{Cd(II)/(Cr(III)} = 1.5). Thermodynamic data were gathered by studying the influence of temperature. In view of future applications to the purification of real wastewaters, the effect of the competition in multimetallic mixtures and the stability of the membrane were also studied. The extraction ratio order was Cd(II) > Hg(II) > Cr(III) and an increase of the Cd(II) extraction ratio was observed with the number of reuses. The transport performances were correlated to the absolute hardness of ions and the structure of the carrier. All data highlighted that the transport mechanism should be of mobile-site jump type.

本文报道了使用新型支撑液膜（SLM）从酸性介质中萃取Hg（II），Cd（II）和Cr（III）离子的方法。这项工作的新颖之处在于使用离子液体（IL）（异辛基甲基咪唑鎓双-2-乙基己基磷酸酯）作为SLM的载体。在微波下合成离子液体并对其进行表征（体积质量密度，粘度和热稳定性）。研究了膜载体疏水性和操作条件（载体浓度，金属离子的性质和浓度，水相的酸度和温度）的影响。通量，渗透率，扩散系数和缔合常数通过动力学研究确定。SLM似乎更适合于在p处萃取Cd（II）离子H = 3（较高的渗透系数：40.3×10 ^-7 cm ² s ^-1，萃取率：运行4小时后的提取率为35％;选择性系数：_{αCd（II）/ Hg（II）} = 1.8和_{αCd（II） /（三价铬}= 1.5）。通过研究温度的影响来收集热力学数据。考虑到将来在实际废水净化中的应用，还研究了多金属混合物中竞争的影响和膜的稳定性。萃取比顺序为Cd（II）> Hg（II）> Cr（III），并且随着重复使用次数的增加，观察到Cd（II）萃取比的增加。传输性能与离子的绝对硬度和载体的结构相关。所有数据都强调传输机制应为移动站点跳转类型。