Rosette-like Layered Double Hydroxides: Adsorbent Materials for the Removal of Anionic Pollutants from Water.

Rosette-like layered double hydroxide (LDH) crystals with interlayer CO anions were synthesized by the reaction of Mg(NO), Al(NO), and hexamethylenetetramine (HMT) at 140 °C over 4 days. Crystals as large as 20 μm were produced when using a specific range of HMT concentrations. The substitution of CO interlayer ions with ClO or Cl anions was achieved by the addition of perchloric acid or hydrochloric acid, respectively, to dispersion of material in methanol.