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Molecularly Imprinted Polymer Colloids Synthesized by Miniemulsion Polymerization for Recognition and Separation of Nonylphenol
journal contribution
posted on 2020-08-05, 16:39 authored by Emile Decompte, Volodymyr Lobaz, Mathilde Monperrus, Elise Deniau, Maud SaveSubmicronic molecularly
imprinted polymer (MIP) colloids were synthesized
by polymerization in aqueous dispersed media for selective separation
of nonylphenol (NP) organic pollutant. A miniemulsion polymerization
process based on ultrasheared monomer droplets has allowed for dispersion
of the hydrophobic organic pollutant template to produce water-dispersible
colloidal MIP. Structural parameters of the cross-linked polymer particles
were tuned during the synthesis to achieve the best compromise between
good specificity of imprinted polymer (MIP) sorbent compared to nonimprinted
polymer (NIP) (i.e., imprinting factor (α)), sufficient level
of adsorption capacity (Q), and selectivity of MIP
toward the organic pollutant. For that purpose, the polymerization
takes place in the organic monomer droplets containing nonylphenol
(NP), N-vinylcaprolactam (VCL), different comonomers
(vinyl acetate (VAc), vinyl benzoate (VB), or 2-ethylhexanoic acid
vinyl ester (VeoVa-EH)), and various contents of divinyl adipate (DVA)
cross-linker. Tuning the level of hydrophobic interactions, either
by the hydrophobicity of the comonomer (VeoVa-EH > VB > VAc)
or by
the polarity of the hydroalcoholic mixture used for interfacial adsorption,
achieved imprinting factors above unity. The binding of NP follows
a monolayer Langmuir adsorption, and the present MIPs selectively
recognize NP compared to phenol. Isothermal titration calorimetry
(ITC) measurements corroborated both specificity (ΔHMIP > ΔHNIP) and
selectivity
with very low values of binding enthalpy for phenol, p-cresol, and 1-octanol compared to that of NP.
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Keywords
hydroalcoholic mixtureNonylphenol SubmicronicVeoVa-EHMIPmonolayer Langmuir adsorptionadsorption capacity1- octanolcross-linked polymer particlesVAccomonomerimprinting factorsdivinyl adipateselectivityMiniemulsion Polymerizationultrasheared monomer dropletsminiemulsion polymerization processnonylphenolDVAspecificityIsothermal titration calorimetrynonimprinted polymerNPΔ H NIPITCvinyl acetate2- ethylhexanoic acid vinyl estermonomer dropletsMolecularly Imprinted Polymer Collo...Structural parametersVBbinding enthalpyVCLpollutant template
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