Microscopic examination of nanosized mixed Ni-Al hydroxide surface precipitates on pyrophyllite (Articolo in rivista)

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Label
  • Microscopic examination of nanosized mixed Ni-Al hydroxide surface precipitates on pyrophyllite (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/es8015606 (literal)
Alternative label
  • K.J.T. Livi1; G.S. Senesi2,3; A.C. Scheinost4,5; D.L. Sparks2 (2009)
    Microscopic examination of nanosized mixed Ni-Al hydroxide surface precipitates on pyrophyllite
    in Environmental science & technology; American Chemical Society, Washington (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • K.J.T. Livi1; G.S. Senesi2,3; A.C. Scheinost4,5; D.L. Sparks2 (literal)
Pagina inizio
  • 1299 (literal)
Pagina fine
  • 1304 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 43 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 5 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 - Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA 2 - Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19717 USA 3 - CNR IMIP Inst Metodol Inorgan & Plasmi, I-70126 Bari, Italy 4 - Rossendorf Beamline ESRF, F-38043 Grenoble, France 5 - FZD, Inst Radiochem, Mol Struct Grp, Dresden, Germany (literal)
Titolo
  • Microscopic examination of nanosized mixed Ni-Al hydroxide surface precipitates on pyrophyllite (literal)
Abstract
  • The nature of Ni-hydroxide precipitates on pyrophyllite were re-examined by analytical electron microscopy (AEM), high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), powder X-ray diffraction (PXRD), and mended X-ray absorption fine structure (EXAFS) spectroscopy. Chemical analysis of precipitates showed that the precipitate contains about 20% Al. HRTEM imaging showed that the precipitate was amorphous and PXRD failed to find any crystalline peaks associated with crystalline Ni-Al layered double-hydroxide (LDH) or alpha-Ni(OH)(2). These results confirmed the conclusion from EXAFS spectroscopic data that Al coprecipitated with Ni on Al-rich substrates to form Ni-Al LDH surface precipitates. However, the HRTEM data clarifies that although the bonding environment of the precipitate is like that of Ni-Al LDH, no long-range ordering of the structure exists. The study illustrates the need for TEM observations to complement EXAFS data and the potential importance of amorphous materials in environmental settings. (literal)
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