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Download fileParticle-Assisted Ion-Imprinted Cryogels for Selective CdII Ion Removal
journal contribution
posted on 18.02.2015, 00:00 authored by Bekir Tabaklı, Aykut Arif Topçu, Serhat Döker, Lokman UzunHerein,
we have reported particle-assisted ion-imprinted cryogels,
which were synthesized by embedding finely crushed functional particles
into cryogel structure under semifrozen conditions. These cryogels
showed high adsorption efficiency and affinity against CdII ions. CdII adsorption performances were evaluated by
varying some effective factors. In order to analyze the data, we applied
Langmuir and Freundlich adsorption isotherms while using three different
kinetic models, pseudo-first-order, pseudo-second-order, and Weber–Morris
as well. Also, the dimensionless equilibrium parameter (RL), initial adsorption rate, and half-adsorption time
were calculated. The results revealed that ion-imprinted-polymer (IIP)
cryogels have homogeneously distributed cavities, which were formed
by a particle-assisted imprinting process, and the theoretical maximum
adsorption capacity (Qmax, 35.97 μg/g)
was very close to the experimental value (Qeq, 32.15 μg/g). In addition, RL values
for both IIP and nonimprinted-polymer cryogels showed favorability
of the adsorption process, while kinetic models indicated that there
were no diffusion limitations during the adsorption process, which
means that the rate-limiting step was chemosorption of heavy-metal
ions on binding sites (imprinted cavities or functional groups) with
a high initial adsorption rate and a low half-adsorption time. Desorption,
reusability, and selectivity studies were also conducted to state
the performance of the cryogels. In conclusion, this promising approach
provides a novel methodology for selective CdII removal
from water sources.