Cu: analiza kinetike sorpcije i XPS karakterizacija produkata

• Published in: Hemijska industrija 2016-01
• Main Authors: Maksin, Danijela D, Nastasovic, Aleksandra B, Maksin, Tatjana N, Sandic, Zvjezdana P, Loos, Katja, Ekmescic, Bojana M, Onjia, Antonije E
• Format: Article
• Language: English
• Subjects: Chemical properties; Chemical reaction, Rate of; Copper; Epoxy resins; Identification and classification; Observations
• ISSN: 0367-598X

Synthesis of an unconventional resin based on 4-vinylpyridine (4-VP) and its Cu(II) sorption behavior were studied. Three samples of macroporous crosslinked poly(4-vinylpyridine-co-ethylene glycol dimethacrylate) [P4VPE] with different porosity parameters were prepared by suspension copolymerization by varying the n-heptane amount in the inert component. The samples were characterized by mercury porosimetry, elemental analysis and x-ray photoelectron spectroscopy (XPS). The sorption of P4VPE for Cu(II) ions, determined under non-competitive conditions, was relatively rapid, i.e. the maximum capacity was reached within 30 min. The maximum experimental sorption capacity for the sample with the highest values of pore diameter and specific pore volume (Sample 3, [Q.sub.eq] = 89 mg [g.sup.-1]) was 17.5 times higher than for the sample with the lowest values of pore diameter and specific pore volume (Sample 1, [Q.sub.eq] = 5.1 mg [g.sup.-1]). Since the values for pyridine content in all P4VPE samples were almost the same, it was concluded that the porosity parameters have predominant influence on Cu(II) sorption rates on P4VPE. The sorption behavior and the ratecontrolling mechanisms were analyzed using six kinetic models (pseudo-first order, pseudosecond order, Elovich, intraparticle diffusion, Bangham and Boyd models). XPS study clarified the nature of the formed P4VPE-Cu(II) species. Key words: 4-vinylpyridine, Macroporous copolymer, Sorption kinetics, XPS U okviru ovog rada sintetizovan je kopolimer na bazi 4-vinilpiridina i ispitana mogucnost njegovog koriScenja za sorpciju Cu(II). Tri umrezena makroporozna uzorka poli(4vinilpiridin-co-etilenglikoldimetakrilata) [P4VPE] sa razlicitim parametrima porozne strukture sintetizovani su suspenzionom kopolimerizacijom. Parametri porozne strukture su podeSavani variranjem udela n-heptana u inertnoj komponenti. Uzorci su okarakterisani zivinom porozimetrijom, elementarnom analizom i rendgenskom fotoelektronskom spektroskopijom (XPS). Zapazene su relativno velike brzine sorpcije Cu(II) jona na uzorcima P4VPE pri nekompetitivnim uslovima, odnosno, vrednost maksimalnog kapaciteta se dostize za 30 minuta. Maksimalni kapacitet sorpcije za uzorak sa najvecom vrednoScu precnika pora i specificne zapremine pora (uzorak 3, [Q.sub.eq] = 89 mg [g.sup.-1]) je 17,5 puta veci od kapaciteta za uzorak sa najmanjom vrednoScu precnika pora i specificne zapremine pora (uzorak 1, [Q.sub.eq] = 5,1 mg [g.sup.-1]). Buduci da je sadrzaj pir