scholarly journals Functionalization of Molecularly Imprinted Polymer Microspheres for the Highly Selective Removal of Contaminants from Aqueous Solutions and the Analysis of Food-Grade Fish Samples

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1130 ◽  
Author(s):  
Weixin Liang ◽  
Huawen Hu ◽  
Wanting Zhong ◽  
Min Zhang ◽  
Yanfang Ma ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Organic Pollutant ◽  
Extraction Column ◽  
Polymer Microspheres ◽  
Order Kinetic ◽  
Imprinted Polymer ◽  
Adsorption Selectivity ◽  
Molecularly Imprinted ◽  
Food Grade ◽  
Fish Samples

The proliferation of pollution in aquatic environments has become a growing concernand calls for the development of novel adsorbents capable of selectively removing notorious andrecalcitrant pollutants from these ecosystems. Herein, a general strategy was developed for thesynthesis and functionalization of molecularly imprinted polymer microspheres (MIPs) that couldbe optimized to possess a significant adsorption selectivity to an organic pollutant in aqueousmedia, in addition to a high adsorption capacity. Considering that the molecular imprinting alonewas far from satisfactory to produce a high-performance MIPs-based adsorbent, further structuralengineering and surface functionalization were performed in this study. Although the more carboxylgroups on the surfaces of the MIPs enhanced the adsorption rate and capacity toward an organicpollutant through electrostatic interactions, they did not strengthen the adsorption selectivity in aproportional manner. Through a systematic study, the optimized sample exhibiting both impressiveselectivity and capacity for the adsorption of the organic pollutant was found to possess a smallparticle size, a high specific surface area, a large total pore volume, and an appropriate amount ofsurface carboxyl groups. While the pseudo-second-order kinetic model was found to better describethe process of the adsorption onto the surface of MIPs as compared to the pseudo-first-order kineticmodel, neither Langmuir nor Freundlich isothermal model could be used to well fit the isothermaladsorption data. Increased temperature facilitated the adsorption of the organic pollutant onto theMIPs, as an endothermic process. Furthermore, the optimized MIPs were also successfully employedas a stationary phase for the fabrication of a molecularly imprinted solid phase extraction column,with which purchased food-grade fish samples were effectively examined.

scholarly journals Selective Enrichment of Clenbuterol onto Molecularly Imprinted Polymer Microspheres with Tailor-made Structure and Oxygen Functionalities

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1635 ◽  
Author(s):  
Xiangyun Zhao ◽  
Yuliang Mai ◽  
Dongchu Chen ◽  
Min Zhang ◽  
Huawen Hu
Keyword(s):  
Molecular Imprinting ◽  
Molecularly Imprinted Polymer ◽  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Feed Additive ◽  
Extraction Column ◽  
Polymer Microspheres ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Selective Enrichment

The noxious clenbuterol misapplied as the feed additive has posed an enormous threat to humans who actively rely on the food chains with high potential of contamination by clenbuterol, such as pork and beef. It is, therefore, highly desirable to develop novel materials and strategies for dealing with the clenbuterol. Herein, functional polymer microspheres prepared by Pickering emulsion polymerization were explored for the selective enrichment of the clenbuterol, and their structure and oxygen functionalities could be tailor-made by a molecular imprinting process. The clenbuterol imprinting was adequately demonstrated to not only increase the particle size (~52 nm vs. ~42 nm) and create cavities for the accommodation of the clenbuterol molecules, but also reduce the oxygen functionalities of the resulting molecularly imprinted polymer microspheres (MIPMs) by approximately 4 at.%, which is believed to correlate with the high specificity of the MIPMs. Various characterization methods were employed to evidence these findings, including scanning electron microscopy, BET measurements, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and elemental mapping examination. More importantly, the MIPMs showed a markedly superior enrichment capability towards clenbuterol to the counterpart, that is, non-molecularly imprinted polymer microspheres (NIPMs). Compared to the NIPMs without specificity for clenbuterol, the MIPMs exhibited an impressive selectivity to clenbuterol, with the relative selectivity coefficient (k′) values largely exceeding 1, thus corroborating that the useful molecular imprinting led to the generation of the binding sites complementary to the clenbuterol molecule in the size and functionalities. The MIPMs were also employed as the stationary phase to fabricate molecularly imprinting solid-phase extraction column, and the spike recovery was demonstrated to be not significantly decreased even after nine cycles. Furthermore, the reliability of the method was also evidenced through the comparison of the MIPMs prepared from different batches.

Water Compatible Molecularly Imprinted Polymer Microspheres for Extraction of Ampicillin in Foods

2010 ◽  
Vol 43 (5) ◽  
pp. 757-767 ◽  
Author(s):  
Xizhi Shi ◽  
Suquan Song ◽  
Guorun Qu ◽  
Sulian Zheng ◽  
Aibo Wu ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Polymer Microspheres ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

scholarly journals Removal of bisphenol A from aqueous media using a highly selective adsorbent of hybridization cyclodextrin with magnetic molecularly imprinted polymer

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
S. Mamman ◽  
F. B. M. Suah ◽  
M. Raaov ◽  
F. S. Mehamod ◽  
S. Asman ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Molecularly Imprinted Polymer ◽  
Binding Capacity ◽  
Bulk Polymerization ◽  
Resonance Spectroscopy ◽  
Template Molecule ◽  
Order Kinetic ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Magnetic Molecularly Imprinted Polymer

In this study, a unique magnetic molecularly imprinted polymer (MMIP) adsorbent towards bisphenol A (BPA) as a template molecule was developed by bulk polymerization using β-cyclodextrin (β-CD) as a co-monomer with methacrylic acid (MAA) to form MMIP MAA–βCD as a new adsorbent. β-CD was hybridized with MAA to obtain water-compactible imprinting sites for the effective removal of BPA from aqueous samples. Benzoyl peroxide and trimethylolpropane trimethacrylate were used as the initiator and cross-linker, respectively. The adsorbents were characterized by Fourier transform infrared spectroscopy, scanning electronic microscopy, transmission electron microscopy, vibrating sample magnetometer, Brunauer–Emmett–Teller and X-ray diffraction. 1 H nuclear magnetic resonance spectroscopy was used to characterize the MAA–βCD and BPA–MAA–βCD complex. Several parameters influencing the adsorption efficiency of BPA such as adsorbent dosage, pH of sample solution, contact time, initial concentrations and temperature as well as selectivity and reusability study have been evaluated. MMIP MAA–βCD showed significantly higher removal efficiency and selective binding capacity towards BPA compared to MMIP MAA owing to its unique morphology with the presence of β-CD. The kinetics data can be well described by the pseudo second-order kinetic and Freundlich isotherm and Halsey models best fitted the isotherm data. The thermodynamic studies indicated that the adsorption reaction was a spontaneous and exothermic process. Therefore, MMIP based on the hybrid monomer of MAA–βCD shows good potential of a new monomer in molecularly imprinted polymer preparation and can be used as an effective adsorbent for the removal of BPA from aqueous solutions.

Synthesis and characterization of molecularly imprinted polymer microspheres functionalized with POSS

2020 ◽  
Vol 511 ◽  
pp. 145506 ◽  
Author(s):  
Jianwei Bai ◽  
Yunan Zhang ◽  
Wenpan Zhang ◽  
Xiaofei Ma ◽  
Yawei Zhu ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Synthesis And Characterization ◽  
Polymer Microspheres ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

Molecularly imprinted polymer microspheres prepared via the two‐step swelling polymerization for the separation of lincomycin

2019 ◽  
Vol 136 (37) ◽  
pp. 47938 ◽  
Author(s):  
Youhong Zhang ◽  
Yinan Lu ◽  
Jiliang Zhong ◽  
Weipeng Li ◽  
Qing Wei ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Polymer Microspheres ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

scholarly journals Application of molecularly imprinted polymer designed for the selective extraction of ketoprofen from wastewater

Water SA ◽  
2018 ◽  
Vol 44 (3 July) ◽  
Author(s):  
Lawrence Mzukisi Madikizela ◽  
Silindile Senamile Zunngu ◽  
Nomchenge Yamkelani Mlunguza ◽  
Nikita Tawanda Tavengwa ◽  
Phumlane Selby Mdluli ◽  
...  
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Selective Extraction ◽  
Bulk Polymerization ◽  
Selectivity Coefficient ◽  
Dynamics Simulation ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Functional Monomer ◽  
Imprinted Polymer ◽  
Molecularly Imprinted

A molecularly imprinted polymer (MIP) that is selective to ketoprofen was synthesized and applied in the adsorption of the target compound from water. The MIP was synthesized using a bulk polymerization method at high temperatures (60–80°C), where ketoprofen, 2-vinylpyridine, ethylene glycol dimethacrylate, toluene and 1,1´-azobis(cyclohexanecarbonitrile) were used as template, functional monomer, cross-linker, porogen and initiator, respectively. Non-imprinted polymer (NIP) was synthesized similarly to the MIP but in the absence of ketoprofen. From molecular dynamics simulation, the nature of interactions that occurred between the template and the functional monomer were found to be based on hydrogen bonding. This was confirmed experimentally, where a high extraction efficiency of ≥ 90% was obtained at acidic conditions (pH 5) due to the protonation of ketoprofen. A contact time of 45 min was sufficient for the maximum adsorption of ketoprofen from 10 mL spiked water using 8 mg of the adsorbent. MIP showed greater selectivity than NIP by achieving a relative selectivity coefficient of 7.7 towards ketoprofen in the presence of structurally related pharmaceuticals. Furthermore, the order of sorption onto the MIPs from water was ketoprofen > fenoprofen > gemfibrozil. From a modelling perspective, the Langmuir adsorption isotherm and pseudo-second-order kinetic model gave the best fit, with maximum adsorption capacity of 8.24 mg·g−1 and sorption rate constant of 0.25 mg·g−1·min−1 for MIP. This was translated to chemisorption of ketoprofen onto the homogeneous MIP binding sites. This work demonstrated the great potential of MIP in selective recognition of ketoprofen from wastewater relative to closely related compounds.

Preparation and Characterization of Molecularly Imprinted Polymer Microspheres of 2,4-Dichlorophenoxyacetic Acid

2013 ◽  
Vol 333-335 ◽  
pp. 1816-1819
Author(s):  
Ming Yang ◽  
Juan Juan Xia ◽  
Kai Guan
Keyword(s):  
Molecularly Imprinted Polymer ◽  
Single Step ◽  
Dichlorophenoxyacetic Acid ◽  
Polymer Microspheres ◽  
Polystyrene Microspheres ◽  
Imprinted Polymer ◽  
Molecular Imprinted Polymers ◽  
Molecularly Imprinted ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Polymerization Method

Polystyrene microspheres were prepared by the emulsifier-free polymerization method. Using the polystyrene microspheres as seeds, 2,4-dichlorophenoxyacetic acid as template molecules, the monodispersed molecularly imprinted polymer microspheres (MIPMs) were prepared by a single-step swelling and polymerization method. The monodispersed molecular imprinted polymers with porous structure were characterized by SEM, and UV-visible spectrophotometry. The adsorption performance of MIPMs for 2,4-dichlorophenoxyacetic acid was investigated.

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