Molecularly imprinted polyaniline on silica support for the selective adsorption of benzophenone-4 from aqueous media

Ayadi, Cherifa; Anene, Amira; Kalfat, Rafik; Chevalier, Yves; Hbaïeb, Souhaïra

doi:10.1016/j.colsurfa.2019.01.042

Cited by 26 publications

(19 citation statements)

References 34 publications

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“…From these values together with the values for BuMA taken from databases: Q BuMA = 0.82 and e BuMA = 0.28 [33], the reactivity ratios of the MA-BuMA pair were estimated (Table 3) as Useful information on the behavior of the monomer during the polymerization process, the chemical composition of the polymer layer and the cross-linking density of the polymer materials can be inferred from the reactivity ratios for the MA and MAA functional monomers. It is worth noticing that the grafted methacryloyl monomers were highly concentrated at the surface of the silica particles, so that they were (5)…”

Section: Discussionmentioning

confidence: 99%

“…However, this apparently simple paradigm requires the tedious task of monitoring several parameters in view of achieving the dream of a highly selective and sensitive "plastic antibody". MIPs can be used in applications where specific chemical recognition is required: specific electrodes, stationary phase of chromatography, extraction materials and nanomedicine [1,[3][4][5]. It is mandatory that cross-linking of the polymer material retains the structural features of the interaction site between the MIP and the target molecule after the later has been removed.…”

Section: Introductionmentioning

confidence: 99%

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Design of Molecularly Imprinted Polymeric Materials: The Crucial Choice of Functional Monomers

Anene¹,

Kalfat²,

Chevalier

et al. 2020

Chemistry Africa

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The choice of the functional monomer is addressed in the present study. It is not only dictated by its ability to interact with the template molecule. Its reactivity towards the cross-linker in the radical polymerization reaction is also to be considered in order to yield a suitable distribution of the monomer bearing binding groups within the material and also to adjust the cross-linking degree which provides rigidity to MIP network. MIPs prepared using two functional monomers of very different reactivity in radical polymerization allowed to investigate the criteria for the optimum choice of the functional monomer. MIPs were made of cross-linked poly(methacrylic acid) or poly(maleic acid) bound as thin films to a silica solid support. Ethylene glycol dimethacrylate was the cross-linker. Calculations of the composition drift of the copolymer material from monomers reactivity ratios give new insights into the control of MIP properties by the choice of the functional monomer. As a consequence of the lower reactivity of maleic acid than methacrylic acid for copolymerization with methacrylic esters, the incorporation of maleic acid is low, the cross-linking density is very high, the polymer coating is very thin, and the specific area is high. The final structure of the MIP network with a predominance of isolated functional units closely surrounded by cross-links yields a rigid material capable of preserving the memory of the model molecule of patulin in molecular imprints. Low reactivity of the functional monomer has beneficial effects regarding the binding selectivity for the target molecule compared to materials prepared from the more reactive methacrylic acid which lead to the formation of flexible polymer formed of short poly(methacrylic acid) sequences.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Molecularly Imprinted Polymeric Materials: The Crucial Choice of Functional Monomers

Anene¹,

Kalfat²,

Chevalier

et al. 2020

Chemistry Africa

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“…In addition, crosslinking agents and inert atmospheres are oen required. Some studies reported the use of molecularly-imprinted polyaniline (PANI) for various applications including water treatment, [40][41][42] sensor applications, 43,44 etc. The recent interest in PANI applications is due to its unique properties which include, but are not limited to, the ease of fabrication, low cost, high stability, high electrical conductivity, etc.…”

Section: Introductionmentioning

confidence: 99%

Matrix-dispersed magnetic molecularly-imprinted polyaniline for the effective removal of chlorpyrifos pesticide from contaminated water

2021

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“…At variance with previously reported materialsb ased on PANI, [27,28] av ery thin PANI layer strongly attached to silica was preferred. As polymerization of aniline yields crystalline PANI particles that do not bind to silica, [29] PANI binding wase nsured by grafting silica with an organosilane containing the aniline moiety,w hich could copolymerize with aniline.…”

Section: Introductionmentioning

confidence: 99%

Molecular Imprints Frozen by Strong Intermolecular Interactions in Place of Cross‐Linking

Ayadi

Anene²,

Kalfat³

et al. 2020

Chemistry A European J

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A new way to freeze molecular imprints in a polymer material is reported. So far, molecular imprinted polymers (MIP) involve copolymerization of a functional monomer and large amounts of cross‐linking agent, which keeps the template shape memory in rigid molecular imprints. MIP materials are prepared herein without cross‐linking agent. Stiff chains of polyaniline grafted on a solid support as a brush‐like material achieve the necessary rigidity. Differential adsorption to imprinted and non‐imprinted materials provides evidence of molecular imprints. A correct adsorption isotherm for mobile adsorbed layers (Volmer isotherm) is introduced instead of the popular but inadequate Langmuir isotherm. Non‐selective adsorption is entropic, whereas adsorption to molecular imprints has an enthalpic contribution coming from specific interactions. Fast adsorption kinetics are a definite benefit with regards to applications such as chromatographic separations and chemical sensors.

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Molecularly imprinted polyaniline on silica support for the selective adsorption of benzophenone-4 from aqueous media

Cited by 26 publications

References 34 publications

Design of Molecularly Imprinted Polymeric Materials: The Crucial Choice of Functional Monomers

Design of Molecularly Imprinted Polymeric Materials: The Crucial Choice of Functional Monomers

Matrix-dispersed magnetic molecularly-imprinted polyaniline for the effective removal of chlorpyrifos pesticide from contaminated water

Molecular Imprints Frozen by Strong Intermolecular Interactions in Place of Cross‐Linking

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