Abstract
An ion-imprinted polymer (IIP) with monophosphonic groups was prepared by thermal copolymerization. Bis(2-methacryloxyethyl) phosphate (BMAOP) was used as functional monomer to react with Fe3+ in dimethyl sulfoxide (DMSO). Ethylene glycol dimethacrylate (EGDMA) was used as cross-linker during polymerization process. A suitable molar ratio of BMAOP to Fe3+ was investigated by UV/Vis/NIR Spectrometer and ICP-OES. The obtained results showed that the monophosphonic groups could be selectively combined with Fe3+ in solutions containing other coexisting ions, and the selectivity could be further enhanced by ion-imprinted process. The prepared IIP was used for removing trace Fe3+ from high concentration basic chromium sulfate solutions. After adsorption process, the concentration of Fe3+ could be reduced from 4.486mg L−1 to 0.171mg L−1, which was much lower than the concentration in the solution treated by non-imprinted polymer (NIP). Moreover, the IIP exhibited excellent recyclability after six adsorption-desorption cycles.
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Abbreviations
- c0 :
-
initial concentration [mg L−1]
- ce :
-
equilibrium concentration [mg L−1]
- D:
-
distribution ratio [mL g−1]
- k:
-
selectivity coefficient
- k1 :
-
kinetics constant [h−1]
- k2 :
-
kinetics constant [g mg−1 h−1]
- k’:
-
relative selectivity coefficient
- KF, 1/n:
-
Freundlich constants
- KL :
-
Langmuir constant [L mg−1]
- m:
-
mass of polymers [g]
- q:
-
adsorption capacity [mg g−1]
- qe :
-
equilibrium adsorption capacity [mg g−1]
- qm :
-
maximum adsorption capacity [mg g−1]
- qt :
-
adsorption capacity at the time of t [mg g−1]
- R:
-
removal rate
- V:
-
volume of solutions [L]
- Kdif :
-
intraparticle diffusion rate constant [mg g−1 min−1/2]
- C:
-
intercept Weber-Morris equation [mg g−1]
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Acknowledgements
This research was supported by the China National Major Science and Technology Program for Water Pollution Control and Treatment (Grant NO. 2018ZX07402005).
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Zhu, Gj., Tang, Hy., Qing, Ph. et al. A monophosphonic group-functionalized ion-imprinted polymer for a removal of Fe3+ from highly concentrated basic chromium sulfate solution. Korean J. Chem. Eng. 37, 911–920 (2020). https://doi.org/10.1007/s11814-020-0485-6
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DOI: https://doi.org/10.1007/s11814-020-0485-6