SciELO - Scientific Electronic Library Online

 
vol.38 issue149Effect of waterlogging stress on the growth, development and symptomatology of cape gooseberry (Physalis peruvianaL.) plantsReconstruction of the concentrations of organic matter and nutrients using spectrometry and diatom analysis in three reservoirs in Antioquia, Colombia author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales

Print version ISSN 0370-3908

Abstract

CAMPOS, Ana María; MORENO, Sonia  and  MOLINA, Rafael Alberto. Characterization of Al-Zr, Al-Hf and Al-Ce-pillared vermiculites by X-ray photoelectron spectroscopy. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2014, vol.38, n.149, pp.401-408. ISSN 0370-3908.

X-ray photoelectron spectroscopy was used to establish the relative concentration and the chemical environment of modifying species in a series of vermiculites pillared with mixed precursors of Al-Zr, Al-Hf and Al-Ce. The binding energies observed provided evidence that zirconium and hafnium are most likely found as Zr-O(H)- and/or Zr-Si- and HfO2, displaying a larger dispersion on the vermiculite surface compared with cerium species (Ce2O3), which are mainly found inside clay aggregates. On the one hand, the chemical analysis showed that with Al-Hf and Al-Zr solutions, the introduction of hafnium and zirconium was complete within the range of 0.5 - 2 mmol g-1 of clay, but the efficiency was reduced with larger quantities. On the other hand, the introduction of cerium in the Al-Ce solutions can be considered to be complete within the range assessed.

Keywords : Pillared vermiculite; zirconium; hafnium; cerium; XPS.

        · abstract in Spanish     · text in English     · English ( pdf )