ORIGINAL RESEARCH
Advantages and Disadvantages of SLM and PIM Systems Used for Chromium(III) Separation from Aqueous Solutions
Paweł Religa1, Jakub Rajewski2, Paweł Gierycz2
 
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1Department of Environmental Protection, Kazimierz Pulaski University of Technology and Humanities in Radom,
Chrobrego 27, 26-600 Radom, Poland
2Faculty of Chemical and Process Engineering, Warsaw University of Technology,
Waryńskiego 1, 00-645 Warsaw, Poland
 
Pol. J. Environ. Stud. 2015;24(3):1283–1290
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ABSTRACT:
This study compares supported liquid membranes (SLM) and polymer inclusion membranes (PIM) used for chromium(III) separation from aqueous solutions. First, the effect of carrier concentration (di(2-ethylhexyl)phosphoric acid) in both systems was investigated. In the case of SLM membranes an optimal concentration of D2EHPA carrier for every initial Cr(III) concentration can be found. The situation is different for PIM membranes, where we can distinguish a certain range of D2EHPA carrier concentration, which guarantees a high diffusion coefficient. Then, the comparison of Cr(III) transport efficiency of SLM and PIM was studied. The SLM assures much faster Cr(III) ion transport than the PIM under the same experimental conditions, which is caused by the difference in the structure between the SLM and PIM membranes. However, the long-term stability of PIM indicated that PIM can be an alternative for traditional liquid membranes for practical implementation of chromium(III) separation from wastewaters and analytical environmental samples.
eISSN:2083-5906
ISSN:1230-1485