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dc.creatorTomić, Zorica
dc.creatorAšanin, Darko P.
dc.creatorAntić-Mladenović, Svetlana
dc.creatorPoharc-Logar, Vesna
dc.creatorMakreski, Petre
dc.date.accessioned2020-12-17T20:33:53Z
dc.date.available2020-12-17T20:33:53Z
dc.date.issued2012
dc.identifier.issn0924-2031
dc.identifier.urihttp://aspace.agrif.bg.ac.rs/handle/123456789/3028
dc.description.abstractNear-infrared (NIR) and mid-infrared (MIR) spectroscopy are irreplaceable methods for characterization of bentonites. The paper presents work on bentonites modified with inorganic Na+ and organic HDTMA(+) (hexaclecyltrimethylammonium) cations and treated by 1.5, 3, 4.5 and 6M H2SO4. The characterization was based on the assignment of the stretching (nu) and bending (delta) vibrations observed in the MIR region and the first overtone [2 nu(R-H)] and combination [nu(R-H)+delta(R-H)] modes of R-H groups (R=O, C) in the NIR region. NIR spectrum shows the characteristic OH and CH bonds for organomontmorillonite. The effect of larger alkylammonium cations on the vibrations of Si-O and OH bonds in montmorillonite layers is observed. A few key-bands in the NIR region show the change of water in the interlayer montmorillonite. The intensities of the overtone (7080 and 6840cm(-1)) and combination (5242cm(-1)) bands of H2O have considerably decreased as a result of hydrophobic character of the NaOM. Spectra of acid-treated samples show a gradual decrease in the intensities of the OH overtone (near 7100-7000cm(-1)) and combination bands (4600-4300cm(-1)) reflecting a fewer number of octahedral atoms. This paper also points out that ATR technique and the 2nd derivative spectrum enables much precise band assignment.en
dc.publisherElsevier, Amsterdam
dc.relationMinistry of Education and ScienceMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
dc.rightsrestrictedAccess
dc.sourceVibrational Spectroscopy
dc.subjectIR spectroscopyen
dc.subjectX-ray powder diffractionen
dc.subjectOrganoclayen
dc.subjectHydrophilicen
dc.subjectHydrophobicen
dc.subjectAcid activationen
dc.subjectSulphuric aciden
dc.titleNIR and MIR spectroscopic characteristics of hydrophilic and hydrophobic bentonite treated with sulphuric aciden
dc.typearticle
dc.rights.licenseARR
dc.citation.epage103
dc.citation.other58: 95-103
dc.citation.rankM22
dc.citation.spage95
dc.citation.volume58
dc.identifier.doi10.1016/j.vibspec.2011.11.002
dc.identifier.rcubconv_4868
dc.identifier.scopus2-s2.0-84855788783
dc.identifier.wos000300600500012
dc.type.versionpublishedVersion


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