Synthesis and characterization of mesoporous polymeric microspheres of methacrylic derivatives of aromatic thiols

Abstract

The paper presents the synthesis and characterization of mesoporous microspheres of derivatives of three aromatic thiols: S-phenyl 2-methylprop-2-enethioate (PSM), S,S′-thiodi-4,1-phenylenebis(thiomethacrylate) (DMSPS), and bis[4(2-hydroxy-3-methacryloyloxypropoxy)phenyl]sulfide (BES.DM) with divinylbenzene (DVB). The microspheres were obtained by the emulsion-suspension polymerization procedure. The chemical and porous structure, morphology, and properties of the microspheres were analyzed by attenuated total reflection-Fourier transform infrared (ATR/FT-IR) spectroscopy, lowtemperature nitrogen adsorption data, optical microscope MORPHOLOGI G3, differential scanning calorimetry (DSC), and wavelength dispersive X-ray fluorescence (WD-XRF). Moreover, studies on the Pb(II) ions sorption process were carried out on the above mentioned compounds. The sorption kinetics and mechanism were described by the pseudo-first order, pseudo-second order, and intraparticle diffusion models. The sorption equilibria were described by the Langmuir and Freundlich isotherms. The PSM-DVB, DMSPS-DVB, and BES.DM-DVB microspheres exhibit high thermal resistance and good adsorption properties of Pb(II) ions. The best adsorption properties for the examined microspheres were obtained at pH 5. The highest monolayer adsorption capacity determined by Langmuir isotherm was obtained for the DMSPS-DVB microspheres and was equal to 22.54 mg/g. The preliminary studies show that the synthesized microspheres can be used as heavy metal ion sorbents from aqueous solutions.

Quinuclidine-Immobilized Porous Polymeric Microparticles as a Compelling Catalyst for the Baylis–Hillman Reaction

“…For porous microparticles, it was observed that microparticles with the lowest DVB content (labeled as P 70 ) display a relatively low surface area of 148 m 2 /g, which increases to 552 m 2 /g, when the DVB content is increased to 100% (labeled as P 0 ). This can be attributed to the earlier phase separation of the polymer within the seed for the reaction mixture comprising a high DVB content, which is due to higher cross-linking density and consequently higher molecular weight. − In addition, the same has been explained by Galia et al that the cross-linking agent is an important feature in the micropore formation within the particles . It was additionally reported that the higher surface area and increase in pore volume resulted as a consequence of increasing the DVB content in the particles, which results in an increase in the number of micropores.…”

“…It was additionally reported that the higher surface area and increase in pore volume resulted as a consequence of increasing the DVB content in the particles, which results in an increase in the number of micropores. The same trend observed in the present research has been evidenced and is reported in the literature. ,− …”

Physicochemical and Adsorption Characteristics of Divinylbenzene-co-Triethoxyvinylsilane Microspheres as Materials for the Removal of Organic Compounds

“…Moreover, in the range of 900–650 cm −1 is possible to see deformation bands of C-H groups at benzene ring, therefore, the presence out of plane ring and H bending vibrations at 695 and 750 cm −1 is detected. Besides, the out of plane bending and twisted vibrations of vinyl groups at 908 and 991 cm −1 are observed [ 36 , 37 , 38 , 39 , 40 , 41 , 42 ].…”

“…The proposed organic-inorganic microspheres show promising properties, especially as adsorbents for the removal of heavy ions and organic compounds from aqueous solutions and selective materials for solid-phase extraction techniques, because of their well-developed porous structures. Also, these materials are characterized by good thermal resistance [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ].…”