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Synthesis and characterization of ethylcellulose polymer composite magnetic membranes

dc.contributor.advisorJančić-Hajneman, Radmila
dc.contributor.otherPutić, Slaviša
dc.contributor.otherRadojević, Vesna
dc.contributor.otherStajić-Trošić, Jasna
dc.contributor.otherNedeljković, Dragutin
dc.creatorStajčić, Aleksandar P.
dc.date.accessioned2018-12-15T09:36:03Z
dc.date.available2018-12-15T09:36:03Z
dc.date.available2020-07-03T09:20:04Z
dc.date.issued2018-09-28
dc.identifier.urihttp://nardus.mpn.gov.rs/handle/123456789/10320
dc.identifier.urihttp://eteze.bg.ac.rs/application/showtheses?thesesId=6332
dc.identifier.urihttps://fedorabg.bg.ac.rs/fedora/get/o:19003/bdef:Content/download
dc.identifier.urihttp://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=50771215
dc.description.abstractFokus ove doktorske disertacije je na pripremi i karakterizaciji magnetnih nanokompozitnih membrana za separaciju gasova, kao i na pripremi i karakterizaciji polimernih membrana za uklanjanje jona teških metala iz vode. Pri procesiranju magnetnih membrana, magnetne nanočestice barijum ferita (BaFe12O19) i stroncijum ferita (SrFe12O19) inkorporirane su u etilcelulozu, sa ciljem pospešivanja difuzije kiseonika u odnosu na azot. Sinteza asimetričnih polimernih membrana na bazi hidrogela ojačanog polietarsulfonom (PES) izvršena je kombinovanjem procesa fazne inverzije sa fotopolimerizacijom i umrežavanjem monomera Ispitivan je uticaj udela nanočestica kod magnetnih nanokompozitnih i udela PES kod polimernih membrana na mehanička i separaciona svojstva. Sa ciljem identifikacije struktura nastalih procesiranjem membrana, izvršene su različite analize, kao što su skenirajuća elektronska mikroskopija (FESEM), mikroskopija atomskih sila (AFM), rendgentskodifrakciona analiza (XRD) i infracrvena spektroskopija sa Furijeovom transformacijom (FTIR) Mehanička svojstva membrana ispitivana su mikro Vikers metodom i zatezanjem. Sorpciona kinetika ispitana je promenom koncentracije jona u rastvoru i opisana je korišćenjem različitih kinetičkih modela. Permeabilnost magnetnih nanokompozitnih membrana ispitana je praćenjem promene izlaznog pritiska smeše azota i kiseonika, kao i čistog azota. Membrane na bazi hidrogelova sa većim sadržajem PES pokazuju poboljšana mehanička svojstva, uz visok adsorpcioni kapacitet. Nanokompozitne magnetne membrane sa većim sadržajem magnetnih nanočestica pokazale su značajno poboljšanje mehaničkih svojstava u poređenju sa čistom etilcelulozom, uz visoku permeabilnost. Navedene analize su pokazale da su nanokompozitne membrane na bazi etilceluloze odličan kandidat za separaciju gasova, dok membrane na bazi hidrogelova pokazuju visok potencijal za uklanjanje jona teških metala iz vode. Na osnovu dosadašnjih saznanja, navedeni materijali nisu bili predmet ranijih istraživanja.sr
dc.description.abstractThe focus of this doctoral dissertation is on the preparation and characterization of magnetic nanocomposite membranes for gas separation, as well as on the preparation and characterization of polymer membranes for removal of heavy metal ions from water. In the processing of magnetic membranes, magnetic nanoparticles of barium ferrite (BaFe12O19) and strontium ferrite (SrFe12O19) were incorporated into ethylcellulose, in order to promote oxygen diffusion against nitrogen. Synthesis of asymmetric hydrogel-based polymer membranes reinforced with polyethersulphone (PES) was performed by combining the phase inversion with photopolymerization and the cross-linking of monomers. The influence of the nanoparticle content in magnetic nanocomposite and the PES fraction in polymer membranes on the mechanical and separation properties was investigated. In order to identify the structures formed by membrane processing, various analyzes were performed, such as scanning electron microscopy (FESEM), atomic force microscopy (AFM), X-ray diffraction XRD and infrared spectroscopy with Fourier transformation (FTIR). Mechanical properties of the membranes were investigated using micro Vickers method and tensile test. The sorption kinetics has been followed with the measurements of ions concentration change in the solution, and was described using different kinetic models. The permeability of magnetic nanocomposite membranes was tested by monitoring the output pressure change of the nitrogen and oxygen mixtures, as well as pure nitrogen. Hydrogel-based membranes with a higher PES content showed enhanced mechanical properties, with high adsorption capacity. Nanocomposite magnetic membranes with a higher content of magnetic nanoparticles have shown a significant improvement in mechanical properties compared to pure ethylcellulose, with high permeability. These findings have shown that nanocomposite membranes based on ethylcellulose are an excellent candidate for gas separation, while hydrogel-based membranes exhibit high potential for removal of heavy metal ions from water. Based on our current knowledge, these materials have not been the subject of previous research.en
dc.formatapplication/pdf
dc.languagesr
dc.publisherУниверзитет у Београду, Технолошко-металуршки факултетsr
dc.rightsopenAccessen
dc.sourceУниверзитет у Београдуsr
dc.subjectmembranesr
dc.subjectmembranesen
dc.subjectgas separationen
dc.subjectremoval of heavy metal ionsen
dc.subjectpermeabilityen
dc.subjectadsorptionen
dc.subjectmechanical propertiesen
dc.subjectpolymer nanocompositesen
dc.subjectseparacija gasovasr
dc.subjectuklanjanje jona teških metalasr
dc.subjectadsorpcijasr
dc.subjectpropustljivostsr
dc.subjectmehanička svojstvasr
dc.subjectpolimerni nanokompozitisr
dc.titleSinteza, karakterizacija i primena polimernih kompozitnih magnetnih membrana na bazi etilcelulozesr
dc.title.alternativeSynthesis and characterization of ethylcellulose polymer composite magnetic membranesen
dc.typedoctoralThesisen
dc.rights.licenseBY-NC-ND
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/17403/IzvestajKomisije18510.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/17402/Disertacija.pdf


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