The active component of the commercial extractant LIX84I, i.e. 2-hydroxy-5-nonylacetophenone (HNAPO), is usually below 50 wt%. The separation performance of polymer inclusion membranes (PIMs) generally increases with increasing the concentration of their liquid phase, consisting of the extractant (e.g., LIX84I) and a possible plasticizer or modifier. However, the use of high concentrations of the membrane liquid phase leads to worsening of the PIM mechanical stability. Therefore, the only way of increasing the concentration of HNAPO in PIMs without affecting their mechanical stability can be based on using diluent free LIX84I with concentration of HNAPO significantly higher than that in commercial LIX84I. This paper reports on a comparison between the performance of PIMs composed of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the base-polymer, commercial or diluent free LIX84I as the extractant and 2-nitrophenyloctyl ether (NPOE) as the plasticizer when used for the extraction and transport of Cu(II) from ammonium sulfate solutions at pH 8.5. The diluent free LIX84I, obtained by a precipitation method, together with commercial LIX84I were characterized by gas chromatography-mass spectrometry and Fourier transform infrared spectroscopy. The percentage of HNAPO was determined by solvent extraction of Cu(II) and found to be 49 wt% and 72 wt% for the commercial and diluent free LIX84I, respectively. A comparative study between commercial and diluent free LIX84I-based PIMs was performed with regards to the extraction and transport of Cu(II) as well as their long term stability. Unexpectedly, the PIMs containing commercial LIX84I performed slightly better than the PIMs containing diluent free LIX84I in terms of extraction and transport rate of Cu(II). A selectivity study showed that both commercial and diluent free LIX84I-based PIMs had good selectivity for Cu(II) in the presence of Zn(II), Mg(II), Ni(II), and Co(II) in ammonium sulfate solutions, although the PIM containing commercial LIX84I was able to separate Cu(II) faster than the one composed of diluent free LIX84I.

商业萃取剂LIX84I的活性组分，即2-羟基-5-壬基苯乙酮（HNAPO），通常低于50重量％。聚合物包含膜（PIM）的分离性能通常随其液相浓度的增加而增加，液相中包含萃取剂（例如LIX84I）和可能的增塑剂或改性剂。但是，使用高浓度的膜液相会导致PIM机械稳定性变差。因此，增加PIM中HNAPO浓度而不影响其机械稳定性的唯一方法可以基于使用无稀释剂的LIX84I，其HNAPO的浓度明显高于市售LIX84I。本文报告了由聚偏二氟乙烯-共-六氟丙烯（PVDF-HFP）作为基础聚合物，市售或无稀释剂的LIX84I作为萃取剂与2-硝基苯基辛基醚（NPOE）构成的PIM的性能比较。增塑剂用于从pH 8.5的硫酸铵溶液中萃取和运输Cu（II）时。通过气相色谱-质谱和傅里叶变换红外光谱对通过沉淀法获得的不含稀释剂的LIX84I以及市售的LIX84I进行了表征。通过溶剂萃取Cu（II）来测定HNAPO的百分比，发现市售的LIX84I和不含稀释剂的LIX84I的HNAPO百分比分别为49 wt％和72 wt％。对商用和无稀释剂的基于LIX84I的PIM进行了比较研究，涉及Cu（II）的提取和运输以及它们的长期稳定性。出乎意料的是，就Cu（II）的萃取和传输速率而言，含有市售LIX84I的PIM的性能略好于不含稀释剂的LIX84I的PIM。选择性研究表明，在硫酸铵溶液中存在Zn（II），Mg（II），Ni（II）和Co（II）的情况下，基于商业和无稀释剂的基于LIX84I的PIM对Cu（II）都具有良好的选择性。 ，尽管含市售LIX84I的PIM能够比不含稀释剂的LIX84I更快地分离出Cu（II）。就Cu（II）的萃取和传输速率而言，含有市售LIX84I的PIM的性能略好于不含稀释剂的LIX84I的PIM。选择性研究表明，在硫酸铵溶液中存在Zn（II），Mg（II），Ni（II）和Co（II）的情况下，基于商业和无稀释剂的基于LIX84I的PIM对Cu（II）都具有良好的选择性。 ，尽管含市售LIX84I的PIM能够比不含稀释剂的LIX84I更快地分离出Cu（II）。就Cu（II）的萃取和传输速率而言，含有市售LIX84I的PIM的性能略好于不含稀释剂的LIX84I的PIM。选择性研究表明，在硫酸铵溶液中存在Zn（II），Mg（II），Ni（II）和Co（II）的情况下，基于商业和无稀释剂的基于LIX84I的PIM对Cu（II）都具有良好的选择性。 ，尽管含市售LIX84I的PIM能够比不含稀释剂的LIX84I更快地分离出Cu（II）。