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2009 | 7 | 3 | 343-353
Tytuł artykułu

Interaction of montmorillonite with phenothiazine dyes and pyronin in aqueous dispersions: A visible spectroscopy study

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Layer charge is one of the key parameters used for the characterisation of expandable clay minerals, smectites. It determines most significant properties of the material which are important from the industrial application point of view. This work is related to a novel method introduced to characterize the layer charge of smectites, based on using cationic organic dyes as molecular sensors. One xanthene and four phenothiazine cationic dyes were tested using reduced charge montmorillonites (RCMs) and compared with methylene blue, which has been used most frequently. The characterization of the charge was based on the formation of molecular assemblies (H- and J-aggregates) composed by dye cations, which were easily detectable using absorption spectroscopy in the UV/VIS spectrum. More detailed characterization of the spectra required calculations of second-derivative curves. For all of the reaction systems tested in this work, the molecular aggregation increased with the layer charge of RCMs. Slight to moderate differences in the formation of dye assemblies related to the differences in the molecular structures of the individual dye cations. For example, the molecular asymmetry of azure A brought about the formation of coexistent species of similar structures. The structure of the heteroaromatic skeleton affected the extent of the aggregation and spectral changes with time. The presence of reactive, non-substituted amino groups in thionine cations probably partially decomposed in the clay mineral colloids based on high-charge RCMs. Any of the tested dyes could be used as molecular sensors for empirical characterization of the layer charge of clays taking into account the differences mentioned above. [...]
Wydawca

Czasopismo
Rocznik
Tom
7
Numer
3
Strony
343-353
Opis fizyczny
Daty
wydano
2009-09-01
online
2009-06-21
Twórcy
  • Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36, Bratislava, Slovakia
  • Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36, Bratislava, Slovakia
Bibliografia
  • [1] A.C.D. Newman, Chemistry of Clays Clay Minerals, Mineralogical Society (Monograph No. 6, New York, 1987)
  • [2] H. Van Olphen, An Introduction to Clay Colloid Chemistry, 2nd edition (Wiley - Interscience, New York, 1977)
  • [3] A.R. Mermut, Layer Charge Characteristics of 2:1 Silicate Clay Minerals, CMS Workshop Lectures Vol. 6 (The Clay Minerals Society, Boulder, Colorado, 1994)
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  • [8] T. Kobayashi, J-aggregates (World Scientific, Singapore, 1996)
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  • [15] B. Cicel, P. Komadel, In: J.E. Amonette, L.W. Zelazny (Eds.), Quantitative Methods in Soil Mineralogy (Soil Science Society of America, Madison, 1994) 114
  • [16] P. Komadel, J. Madejová, J. Bujdák, Clays Clay Miner. 53, 313 (2005) http://dx.doi.org/10.1346/CCMN.2005.0530401[Crossref]
  • [17] H. Mark, J. Workman, Spectroscopy 18, 1 (2003)
  • [18] J. Bujdák, V.M. Martínez, L.F. Arbeloa, N. Iyi, Langmuir 23, 1851 (2007) http://dx.doi.org/10.1021/la062437b[Crossref]
  • [19] A. Czímerová, N. Iyi, J. Bujdák, J. Colloid Interface Sci. 320, 140 (2008) http://dx.doi.org/10.1016/j.jcis.2007.10.055[Crossref]
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11532-009-0035-x
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