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  • From the point of view of possible application of geopolymers for fixation of hazardous metal accessibility of cations in Na-geopolymer for exchange by Cs+, NH4+ and Co2+ ions was investigated. UV-Vis spectroscopy of Co2+ ions in Co exchanged geopolymer was used to characterize the local geometry of Co2+ ions and shape of local structures accommodating Co2+ ions. All Na+ ions balancing Al atoms of the geopolymer network could be replaced by NH4+ or Co2+ ions. In analogy to zeolites, it indicates that all Al atoms are accessible through rings containing at least 8 or more Al and Si atoms. Co2+ ions in geopolymer network are in two types of deformed six or eight member rings. As evidenced by the lower extend of Cs+ exchange only one half of Al atoms is at the same time accessible through ten-member or bigger rings. Therefore, although kinetic of cation exchange could greatly influence the leaching of hazardous metals from the solid matrix, utilization of geopolymers for their fixation has limitations.
  • From the point of view of possible application of geopolymers for fixation of hazardous metal accessibility of cations in Na-geopolymer for exchange by Cs+, NH4+ and Co2+ ions was investigated. UV-Vis spectroscopy of Co2+ ions in Co exchanged geopolymer was used to characterize the local geometry of Co2+ ions and shape of local structures accommodating Co2+ ions. All Na+ ions balancing Al atoms of the geopolymer network could be replaced by NH4+ or Co2+ ions. In analogy to zeolites, it indicates that all Al atoms are accessible through rings containing at least 8 or more Al and Si atoms. Co2+ ions in geopolymer network are in two types of deformed six or eight member rings. As evidenced by the lower extend of Cs+ exchange only one half of Al atoms is at the same time accessible through ten-member or bigger rings. Therefore, although kinetic of cation exchange could greatly influence the leaching of hazardous metals from the solid matrix, utilization of geopolymers for their fixation has limitations. (en)
  • Z hlediska možné aplikace geopolymerů pro stabilizaci nebezpečných kovů byla zkoumána přístupnost kationtů v Na-geopolymeru pro iontovou výměnu za kationty Cs, Co a NH4+. UV-Vis spektroskopie Co2+ iontů v Co-geopolymeru byla použita pro charakterizaci lokální geometrie Co2+ kationtů a formy lokální struktury geopolymerní matrice. Všechny Na kationty bilancující Al atomy v mřížce připraveného geopolymeru jsou schopné výměny za NH4+ a Co2+ kationty. Dle analogie se zeolity toto znamená, že všechny atomy hliníku jsou přístupné přes kruhy obsahující alespoň 8 a více atomu Al a Si. Co2+ ionty v geopolymerní mřížce se nacházejí ve dvou typech deformovaných 6- nebo 8-členných kruzích. Jak plyne z nižší míry iontové výměny Cs+ iontů pouze polovina atomu hliníku je přístupná přes alespoň 10-členné kruhy. Z uvedeného vyplývá, že ačkoliv kinetika iontové výměny může zásadně ovlivnit vyluhovatelnost nebezpečných kovů z pevné matrice, aplikace geopolymeru pro jejich fixaci má určité limity. (cs)
Title
  • Application of metal ions exchanged and UV-Vis spectroscopy for geopolymer characterization
  • Aplikace iontové výměny kationtů a UV-VIS spektroskopie pro charakterizaci geopolymeru (cs)
  • Application of metal ions exchanged and UV-Vis spectroscopy for geopolymer characterization (en)
skos:prefLabel
  • Application of metal ions exchanged and UV-Vis spectroscopy for geopolymer characterization
  • Aplikace iontové výměny kationtů a UV-VIS spektroskopie pro charakterizaci geopolymeru (cs)
  • Application of metal ions exchanged and UV-Vis spectroscopy for geopolymer characterization (en)
skos:notation
  • RIV/62243136:_____/08:#0000019!RIV09-MPO-62243136
http://linked.open...avai/riv/aktivita
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  • P(FI-IM/079)
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  • 356760
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  • RIV/62243136:_____/08:#0000019
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  • geopolymer; Co2+ ion excahnge; UV-Vis spectroscopy (en)
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  • [085A854A223E]
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  • Brno
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  • Brno
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  • Non-Traditional Cement & Concrete III, Proceeding of the International Symposium
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  • Bortnovsky, Oleg
  • Dědeček, Jiří
  • Sobalík, Zdeněk
  • Šubrt, Jan
  • Tvarůžková, Zděnka
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number of pages
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  • Vysoké učení technické v Brně
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  • 978-80-214-3642-8
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