Behavior of Layered Double Hydroxides Having Different Divalent Transition Metal Groups

  • Mamat M
  • Tagg T
  • Khairul W
 et al. 
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The layered double hydroxides (LDHs) with different divalent transition metal groups and nitrate as a counter anion were investigated. Three d-block divalent metals namely cobalt (Co), nickel (Ni) and copper (Cu) were selected. The cobalt/aluminium (CoAN)-, nickel/aluminium (NiAN)-and copper/aluminium (CuAN)-layered double hydroxides were successfully synthesized via co-precipitation method. All the obtained LDHs were characterized by PXRD, FT-IR, ICP-OES, CHNS and TGA/DTG analysis. Interestingly, behavior of the LDHs was dependent on the size of divalent cations. PXRD showed the basal spacing decrease in the order NiAN (0.88nm)> CuAN (0.87nm) > CoAN (0.74nm), and in a linear correlation with the increasing radii of the divalent cations. Similar trend is observed for the weight loss of LDHs, where NiAN has the highest weight loss (53%), followed by CuAN (43%) and CoAN (34%). Further elemental analysis showed the content of trivalent metal cations, nitrate anions and water molecules in the LDHs decrease with the increasing radii.

Author-supplied keywords

  • cation radius
  • divalent transition metal
  • layered double hydroxide

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  • Mazidah Mamat

  • Tei Tagg

  • Wan Mohd Khairul

  • Mohd Aidil Adhha Abdullah

  • Norhayati Mohd Tahir

  • Zaemah Jubri

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