Abstract
Zn,Al layered double hydroxides (LDHs) intercalated by a series of organic chelating ligands (L), including anionic ethylenediamine-N,N-diacetate (EDDA), nitrilotriacetate (NTA), ethylenediaminetetraaetate (EDTA), and diethylenetriaminepentaacetate (DTPA) as guests, were prepared by co-precipitation and anion exchange of precursor Zn,Al-NO3 LDHs. The chelation of transition metal ions (Co 2+ and Ni 2+ ) from aqueous solution and the intercalation of pre-formed complexes of the type (M(edda)) 2- , (M(nta)) - , (M(edta)) 2- and (M(dtpa)) 3- , have been investigated. Powder X-ray diffraction (PXRD) showed that the basal spacing increased from 9.0 A for the precursor materials to 12.0-15.3 A for the pillared hybrids. Elemental analysis and FT-IR spectroscopy indicated that most of the interlayer nitrate anions were displaced by L anions to form LDHs-L, which then reacted with the metal ions to form (M(L)) n- complexes between the LDHs layers. The compounds were studied by thermal gravimetric (TG) and differential thermal analysis (DTA).
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