Precipitation of thermal polymerization was used for preparation of
Fe(III)-ion imprinted polymer. In this procedure, 1 mmol (0.404 g) of
Fe(NO3)3·9H2O and 1 mmol (0.272 g) of (DHBPT)2 were dissolved in
40 mL ethanol as a porogenic solvent. Subsequently, themixture stirredby magnetic stirrer bar for 1 h under reflux conditions, the ternary complex
was formed. Then 4.7 mmol (0.4 mL) methacrylic acid (MAA),
30 mmol of ethylene glycoldimethacrylate (EGDMA) and 0.4 mmol of
2,2Œ-azobis-isobutyronitrile as a free radical initiator were added to
the mixture, then transferred mixture into the oil bath at 60 ‹C and
stirred by a magnetic stirrer bar under a nitrogen atmosphere for 24 h.
The resulting Suspension was centrifuged and removed extra solvent.
The resulting brown powder was washed with ethanol and deionized
water to remove the unreacted material. Imprinted ion was leached
with 2 ~ 50 mL of 50% (v/v) hydrochloric acid by continuous stirring
for 18 h. Finally, the color of the prepared IIP was changed to white.
This color change was indicated that the washing process has been
successfully completed. The Fe(III) ion imprinted polymer was kept in
an oven to dry and save. The non-imprinted polymer (NIP) was also
preparedwithout ions of iron. Scheme 1 shows the synthetic procedure
for ion-imprinted polymer