@article { ISI:000267546200006,
	title = {Structural characterization of azoic dye hosted layered double hydroxides},
	journal = {Zeitschrift fur Kristallographie},
	volume = {224},
	number = {5-6},
	year = {2009},
	month = {JAN},
	pages = {282-286},
	publisher = {OLDENBOURG VERLAG},
	address = {LEKTORAT MINT, POSTFACH 80 13 60, D-81613 MUNICH, GERMANY},
	abstract = {<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>},
	keywords = {Anionic exchange, Depollution, layered double hydroxides, Methyl orange, X-ray diffraction},
	issn = {0044-2968},
	doi = {10.1524/zkri.2009.1150},
	author = {Mandal, Sujata and Lerner, Dan A. and Marcotte, Nathalie and Tichit, Didier}
}
