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Application of molecularly imprinted polymers to selective removal of clofibric acid from water.

Dai C, Zhang J, Zhang Y, Zhou X, Liu S - PLoS ONE (2013)

Bottom Line: Sorption experimental results showed that the MIP had excellent binding affinity for CA and the adsorption of CA by MIP was well described by pseudo-second-order model.The MIP synthesized was used to remove CA from spiked surface water and exhibited significant binding affinity towards CA in the presence of total dissolved solids (TDS).In addition, MIP reusability was demonstrated for at least 12 repeated cycles without significant loss in performance.

View Article: PubMed Central - PubMed

Affiliation: College of Civil Engineering, Tongji University, Shanghai, China ; State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China.

ABSTRACT
A new molecularly imprinted polymer (MIP) adsorbent for clofibric acid (CA) was prepared by a non-covalent protocol. Characterization of the obtained MIP was achieved by scanning electron microscopy (SEM) and nitrogen sorption. Sorption experimental results showed that the MIP had excellent binding affinity for CA and the adsorption of CA by MIP was well described by pseudo-second-order model. Scatchard plot analysis revealed that two classes of binding sites were formed in the MIP with dissociation constants of 7.52 ± 0.46 mg L(-1) and 114 ± 4.2 mg L(-1), respectively. The selectivity of MIP demonstrated higher affinity for CA over competitive compound than that of non-imprinted polymers (NIP). The MIP synthesized was used to remove CA from spiked surface water and exhibited significant binding affinity towards CA in the presence of total dissolved solids (TDS). In addition, MIP reusability was demonstrated for at least 12 repeated cycles without significant loss in performance.

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Scanning electron microscopy of the MIP (a) and NIP (b).
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pone-0078167-g001: Scanning electron microscopy of the MIP (a) and NIP (b).

Mentions: The morphology of MIP and NIP were observed by scanning electron microscopy (SEM). As shown in Fig. 1, the well shaped particles had been produced and isolated in the form of discrete polymer with narrow particle size distributions and average diameters (2.9±0.8 µm) in the low micrometre size range. The MIP seems to possess spherical structures with rough surfaces. Spherical molecular imprinting polymers have large surface area, indicating that large number of effective imprinting sites could exist in the surface to rebind the template molecules in aqueous media. Nitrogen sorption porosimetry showed that MIP had well-developed pore structures in the dry state and the specific surface area, pore volume and pore size were 512±7 m2 g−1, 0.21±0.07 cm3 g−1 and 2.29±0.4 nm, respectively. For NIP, the specific surface area, pore volume and pore size were 457±5 m2 g−1, 0.19±0.03 cm3 g−1 and 2.26±0.6 nm respectively, which were not significantly different from those of MIP (p>0.05). Therefore, the distinct adsorption properties for MIP and NIP could not entirely be attributed to the morphological differences but to the imprinting effect.


Application of molecularly imprinted polymers to selective removal of clofibric acid from water.

Dai C, Zhang J, Zhang Y, Zhou X, Liu S - PLoS ONE (2013)

Scanning electron microscopy of the MIP (a) and NIP (b).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3814990&req=5

pone-0078167-g001: Scanning electron microscopy of the MIP (a) and NIP (b).
Mentions: The morphology of MIP and NIP were observed by scanning electron microscopy (SEM). As shown in Fig. 1, the well shaped particles had been produced and isolated in the form of discrete polymer with narrow particle size distributions and average diameters (2.9±0.8 µm) in the low micrometre size range. The MIP seems to possess spherical structures with rough surfaces. Spherical molecular imprinting polymers have large surface area, indicating that large number of effective imprinting sites could exist in the surface to rebind the template molecules in aqueous media. Nitrogen sorption porosimetry showed that MIP had well-developed pore structures in the dry state and the specific surface area, pore volume and pore size were 512±7 m2 g−1, 0.21±0.07 cm3 g−1 and 2.29±0.4 nm, respectively. For NIP, the specific surface area, pore volume and pore size were 457±5 m2 g−1, 0.19±0.03 cm3 g−1 and 2.26±0.6 nm respectively, which were not significantly different from those of MIP (p>0.05). Therefore, the distinct adsorption properties for MIP and NIP could not entirely be attributed to the morphological differences but to the imprinting effect.

Bottom Line: Sorption experimental results showed that the MIP had excellent binding affinity for CA and the adsorption of CA by MIP was well described by pseudo-second-order model.The MIP synthesized was used to remove CA from spiked surface water and exhibited significant binding affinity towards CA in the presence of total dissolved solids (TDS).In addition, MIP reusability was demonstrated for at least 12 repeated cycles without significant loss in performance.

View Article: PubMed Central - PubMed

Affiliation: College of Civil Engineering, Tongji University, Shanghai, China ; State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China.

ABSTRACT
A new molecularly imprinted polymer (MIP) adsorbent for clofibric acid (CA) was prepared by a non-covalent protocol. Characterization of the obtained MIP was achieved by scanning electron microscopy (SEM) and nitrogen sorption. Sorption experimental results showed that the MIP had excellent binding affinity for CA and the adsorption of CA by MIP was well described by pseudo-second-order model. Scatchard plot analysis revealed that two classes of binding sites were formed in the MIP with dissociation constants of 7.52 ± 0.46 mg L(-1) and 114 ± 4.2 mg L(-1), respectively. The selectivity of MIP demonstrated higher affinity for CA over competitive compound than that of non-imprinted polymers (NIP). The MIP synthesized was used to remove CA from spiked surface water and exhibited significant binding affinity towards CA in the presence of total dissolved solids (TDS). In addition, MIP reusability was demonstrated for at least 12 repeated cycles without significant loss in performance.

Show MeSH
Related in: MedlinePlus