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Modifikacija strukture smektita sumpornom kiselinom i karakteristike modifikovanih smektita

dc.creatorTomić, Zorica
dc.creatorAntić-Mladenović, Svetlana
dc.creatorBabić, Biljana M.
dc.creatorPoharc-Logar, Vesna A.
dc.creatorDjordjević, Aleksandar
dc.creatorCupać, Svjetlana
dc.date.accessioned2020-12-17T20:05:50Z
dc.date.available2020-12-17T20:05:50Z
dc.date.issued2011
dc.identifier.issn1450-8109
dc.identifier.urihttp://aspace.agrif.bg.ac.rs/handle/123456789/2565
dc.description.abstractBentonite samples from Petrovac and Aleksinac were treated with sulfuric acid of different molarities. Differences in structure and texture of the initial and modified bentonite were determined by chemical analysis and Xraypowder diffraction (XRPD), infra-red spectroscopy (FTIR), scanning electron microscopy (SEM) and physisorption nitrogen at -196°C. Sulfuric acid caused an exchange of Al3+, Fe3+ and Mg2+ with H+ ions which led to a modification of the smectite crystalline structure. The Mg and Fe substitution in the octahedral sheet promoted the dispersion of those layers and forming of amorphous silicon. The sequence according to which the cations left the octahedral sheets was as follows: Mg2+>Fe3+>Al3+. The sulfuric acid activated bentonites exhibiting a lower cation exchange capacity (CEC) and a change of specific surface area (SBET) from 6 to 387 for bentonite from Petrovac and from 44 to 1784 m2 g-1 for bentonite from Aleksinac, positioning them as an excellent absorber in wine technology and in the protection of soil and environment.en
dc.description.abstractUzorci bentonita iz Petrovca i Aleksinca tretirani su različitim molaritetima sumporne kiseline. Promene u strukturi i teksturi polaznih i modifikovanih bentonita utvrđene su hemijskom i analizom rendgenske difrakcije praha X-zraka (XRPD), infra crvenom spektroskopijom (FTIR), skening elektronskom mikroskopijom (SEM) i fizisorpcijom azota na -196°C. Dejstvo H2SO4 kiseline izazvalo je zamenu Al3+, Fe3+ i Mg2+ sa H+ jonima što je dovelo do modifikacije kristalne strukture smektita. Supstitucija Mg i Fe u oktaedarskom listu smektita promovisala je raspuštanje tih slojeva i formiranje silikatne faze. Redosled kojim su ovi katjoni napuštali oktaedarske listove bio je sledeći: Mg2+>Fe3+>Al3+. Sumpornom kiselinom aktivirani bentoniti pokazali su niži kapacitet katjonske izmene (CEC) i promenu specifične površine (SBET), od 6 na 387 kod bentonita Petrovca i od 44 na 1784 m2 g-1 kod bentonita Aleksinca, što ih svrstava u odlične absorbente u tehnologiji vina, zaštiti zemljišta i životne sredine.sr
dc.publisherUniverzitet u Beogradu - Poljoprivredni fakultet, Beograd
dc.relationProjekat Ministarstva nauke Republike Srbije, br. 133-20098-preservation
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-sa/4.0/
dc.sourceJournal of Agricultural Sciences (Belgrade)
dc.subjectbentoniteen
dc.subjectacid activationen
dc.subjectsmectiteen
dc.subjectcation exchange capacityen
dc.subjectspecific surface areaen
dc.subjectbentonitsr
dc.subjectaktiviranje kiselinomsr
dc.subjectsmektitsr
dc.subjectkapacitet katjonske izmenesr
dc.subjectspecifična površinasr
dc.titleModification of smectite structure by sulfuric acid and characteristics of the modified smectiteen
dc.titleModifikacija strukture smektita sumpornom kiselinom i karakteristike modifikovanih smektitasr
dc.typearticle
dc.rights.licenseBY-SA
dc.citation.epage35
dc.citation.issue1
dc.citation.other56(1): 25-35
dc.citation.rankM51
dc.citation.spage25
dc.citation.volume56
dc.identifier.doi10.2298/JAS1101025T
dc.identifier.fulltexthttp://aspace.agrif.bg.ac.rs/bitstream/id/1328/2562.pdf
dc.type.versionpublishedVersion


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