02268nas a2200241   4500008004100000022001400041245007800055210006900133260008600202300001200288490000800300520141800308653002101726653001601747653003001763653001801793653002201811100001901833700002001852700002301872700001901895856011201914       2009                        eng d  a0044-296800aStructural characterization of azoic dye hosted layered double hydroxides0 aStructural characterization of azoic dye hosted layered double h  aLEKTORAT MINT, POSTFACH 80 13 60, D-81613 MUNICH, GERMANYbOLDENBOURG VERLAGcJAN  a282-2860 v2243 a<p>The removal of methyl orange (MO) from an aqueous solution was performed using layered double hydroxides (LDHs) in a move to develop cleaning processes of effluents contaminated with dye molecules. The intercalation of the guest anionic MO species into host M(II)/Al(III) LDHs differing by the nature of the divalent cations (M(II) = Mg, Ni or Zn) was achieved by anionic exchange of the initially NO(3)(-) present in the interlayer space and led to MO/LDH intercalation compounds. The exchange process was followed by XRD and UV-visible absorption spectroscopy at different stages. Almost all MO in solution is uptaken by the Mg-containing LDH in the concentration range corresponding to its anionic exchange capacity (AEC). A lower exchange is reached with the Ni- and Zn-containing LDHs, for which the diffusion of MO is limited due to a larger crystallite size. MO-Zn/Al LDH intercalation compounds exhibit the highest crystallinity and display a remarkable stacking of the layers at maximal MO exchange. This behaviour can be assigned to the higher intrinsic charge density of the host layers in agreement with its lower M(II)/Al(III) molar ratio (Zn(II)/Al(III) approximate to 1.5 whereas Mg(II)/Al(III) and Ni(II)/Al(III) = 2). The maximum amount of MO retained by the different LDHs is higher for Mg-containing LDH, than for Ni- and Zn-containing LDH, reaching respectively 1.15, 0.84 and 0.77 g/g.</p>10aAnionic exchange10aDepollution10alayered double hydroxides10aMethyl orange10aX-ray diffraction1 aMandal, Sujata1 aLerner, Dan, A.1 aMarcotte, Nathalie1 aTichit, Didier  uhttps://library.ncl.res.in/content/structural-characterization-azoic-dye-hosted-layered-double-hydroxides-0