Hydrophilic magnetic molecularly imprinted resin in PVDF membrane for efficient selective removal of dye

jahankhah, Samaneh; Sabzehmeidani, Mohammad Mehdi; Ghaedi, Mehrorang; Dashtian, Kheibar; Abbasi-Asl, Hamid

doi:10.1016/j.jenvman.2021.113707

Cited by 34 publications

(3 citation statements)

References 62 publications

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“…This is due to the shielding of the coating on the magnet, resulting in the corresponding reduction of its saturation magnetization. VSM data confirms as the increase of modified shells, the three materials still have superparamagnetism 40,41. It can be seen from the illustration of Figure3Dthat the SA-MIPs uniformly dispersed in the solution can be rapidly separated and enriched within 22 s under the action of an external magnetic field, which indicates that the prepared imprinted material has a significant magnetic response and can be used as an adsorbent to achieve efficient magnetic separation and recovery under the action of a magnetic field.F I G U R E 3 Transmission electron microscopy image of SA-MIPs (A); Fourier-transform infrared spectra of Fe 3 O 4 , Fe 3 O 4 @SiO 2 , Fe 3 O 4 @SiO 2 -KH570, SA-MIPs, and SA-NIPs (B); thermal gravimetric analysis curves of Fe 3 O 4 , Fe 3 O 4 @SiO 2 -KH570, and SA-MIPs (C); magnetic hysteresis loops of Fe 3 O 4 , Fe 3 O 4 @SiO 2 -KH570, and SA-MIPs (D).…”

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confidence: 53%

Section: Resultsmentioning

confidence: 54%

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Improved selectivity of molecularly imprinted polymers based on the synergistic action of hydrogen bond and electrostatic interaction

Zhao

Wang

et al. 2023

J of Molecular Recognition

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Based on the synergistic action of hydrogen bond and electrostatic interaction, provided by methacrylic acid and 2‐aminoethyl ester hydrochloride (FM2), respectively, novel molecularly imprinted polymers (SA‐MIPs) were designed to improve its selective recognition ability. Diclofenac sodium (DFC) was chosen as the template molecule of this study. The interaction and their recognition sites between two functional monomers and templates were confirmed by nuclear magnetic resonance hydrogen spectroscopy. Because of the synergistic action of hydrogen bond and electrostatic interaction, the imprinting factor (IF) of SA‐MIPs (IF = 2.26) is superior to the corresponding monofunctional monomer imprinting materials (IF = 1.52, 1.20) and the materials using two functional monomers with an only single type of interaction (IF = 1.54, 1.75). The results of selective adsorption experiments indicate that the selective recognition ability of SA‐MIPs is significantly better than that of the other four MIPs, and the difference in selectivity coefficient for methyl orange is the largest between SA‐MIPs and the MIPs only using FM2, which is about 70 times. In addition, x‐ray photoelectron spectroscopy was used to verify the interaction between SA‐MIPs and the template. This work and its explanation of the interaction mechanism at the molecular level will be helpful for the rational design of novel MIPs with higher selectivity. Besides, SA‐MIPs have good adsorption performance (37.75 mg/g) for DFC in aqueous solutions, which could be used as potential adsorption materials for the effective removal of DFC in the aquatic environment.

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supporting

confidence: 53%

Section: Resultsmentioning

confidence: 54%

Improved selectivity of molecularly imprinted polymers based on the synergistic action of hydrogen bond and electrostatic interaction

Zhao

Wang

et al. 2023

J of Molecular Recognition

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“…It was shown that in the presence of polyethylene glycol (porogen) with an average molecular mass of 10000 Da, the sorption capacity of quercetin by the molecularly-imprinted sample was ~5 µmol/g, the specific surface area was 288.1 m 2 /g, and the imprinting factor was 1.41. It was shown that recovery of quercetin (21-43%) is slightly lower, but the imprinting factor (1.4) is not inferior to that of the similar methods for extracting phenolic compounds [26] and dyes [29] with resorcinol-melamine-formaldehyde and phenol-formaldehyde resins, as well as quercetin with surface-imprinted polymers [30,31]. Modeling of the kinetics and isotherms of quercetin rebinding by the samples, obtained in the presence of polyethylene glycol of different average molecular mass, showed compliance with the pseudo-second-order model and the Freundlich model describing an inhomogeneous surface.…”

Section: Discussionmentioning

confidence: 99%

Hydrophilic molecularly imprinted phenol-amine-formaldehyde resins

Petrova,

Bulatova,

Zelentsov

et al. 2023

Chim.Tech.Acta

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Hydrophilic molecularly imprinted resins (MIR), which are produced using hydrophilic monomers such as phenols, aldehydes, melamine or urea, have recently attracted increasing attention for use in separation and preconcentration. Among their obvious advantages are good sorption capacity, high recovery and selectivity, as well as their reusability in aqueous solutions. In this work we applied the bulk molecular imprinting method to produce quercetin-imprinted phenol-amino-formaldehyde resin. For this purpose, phloroglucinol and melamine solutions were mixed with formaldehyde and then polyethylene glycol and quercetin (Qu) were added to the obtained solution as a porogen and a template, respectively. The mixture was stirred under heating, then left in the thermostat for a continuous time. The optimum ratio of phloroglucinol to melamine was 3:1. The average molecular mass of porogen (Mw) varied between 4000–10000 Da. The obtained MIR were eluted with ethanol-water mixture (4:1, v/v) in the Soxhlet extractor for 36 h to remove the template. The MIR were characterized by FTIR-spectroscopy, laser diffraction spectroscopy and differential thermal analysis. The maximum recovery and sorption capacity of MIR synthesized in the presence of a porogen with Mw 10000 were 47% and 4.7 μmol Qu/g, respectively. The maximum imprinting factor was 1.41. The sorption kinetics of quercetin by a non-imprinted resin (NIR) is best described by a pseudo-second-order model, while MIR has a mixed pseudo-first-second-order mechanism.

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Enhancing the Performance of Ultrafiltration (UF) Membranes with the Aid of Functional Coatings

Sen,

Das,

Ghosh

et al. 2024

Functional Coatings for Biomedical, Energy, and Environmental Applications

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Hydrophilic magnetic molecularly imprinted resin in PVDF membrane for efficient selective removal of dye

Cited by 34 publications

References 62 publications

Improved selectivity of molecularly imprinted polymers based on the synergistic action of hydrogen bond and electrostatic interaction

Improved selectivity of molecularly imprinted polymers based on the synergistic action of hydrogen bond and electrostatic interaction

Hydrophilic molecularly imprinted phenol-amine-formaldehyde resins

Enhancing the Performance of Ultrafiltration (UF) Membranes with the Aid of Functional Coatings

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