Kagaya Shigehiro, Maeno Tomonori, Ito Kazuma, Gemmei-Ide Makoto, Cattrall Robert W, Kolev Spas D
Graduate School of Science and Engineering for Research, University of Toyama.
School of Chemistry, The University of Melbourne.
Anal Sci. 2017;33(5):643-646. doi: 10.2116/analsci.33.643.
An important reason for the inefficient extraction of Cr(VI) from its acidic solutions into polymer inclusion membranes (PIMs), consisting of poly(vinyl chloride) as the base-polymer and Aliquat 336 as the carrier, was found to be associated with the leaching of Aliquat 336 from the PIMs into the solutions, where it subsequently reduced the anionic Cr(VI) species to cationic Cr(III) species. The PIM extraction efficiency for Cr(VI) was significantly improved by the addition of NaNO to the solutions, which suppressed the leaching of Aliquat 336 and the reduction of Cr(VI) to Cr(III).
在由聚氯乙烯作为基础聚合物、Aliquat 336作为载体组成的聚合物包容膜（PIMs）中，六价铬（Cr(VI)）从其酸性溶液中萃取效率低下的一个重要原因，被发现与Aliquat 336从PIMs中浸出到溶液中有关，在溶液中它随后将阴离子六价铬（Cr(VI)）物种还原为阳离子三价铬（Cr(III)）物种。通过向溶液中添加硝酸钠（NaNO），六价铬（Cr(VI)）的PIM萃取效率得到显著提高，这抑制了Aliquat 336的浸出以及六价铬（Cr(VI)）还原为三价铬（Cr(III)）。
