Layered double hydroxide stability. 1. Relative stabilities of layered double hydroxides and their simple counterparts.
Solutions containing di- and trivalent metal chlorides [M(II) = Mg2+, Zn2+, Co2+, Ni2+, Mn2+; M(III) = Al3+, Fe3+] were titrated with NaOH to yield hydrotalcite-like layered double hydroxides (LDH), [[M(II)]1-x[M(III)]x(OH)2][Cl]x yH2O, by way of M(III) hydroxide/hydrous oxide intermediates. Analysis of the resultant titration curves yields nominal solubility constants for the LDH. The corresponding LDH stabilities are in the order Mg < Mn < Co approximately Ni < Zn for M(II) and Al < Fe for M(III). The stability of LDH relative to the separate metal hydroxides/hydrous oxides is discussed.
Boclair
J W
JW
Department of Chemistry, University of North Texas, Denton 76203-5070, USA.
Braterman
P S
PS
D000535:Aluminum / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D000838:Anions / Q000737:chemistry*; D002384:Catalysis; D002412:Cations / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry*; D000077215:Clay; D003035:Cobalt / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D012996:Solutions; D017186:Titrimetry; D015032:Zinc / Q000737:chemistry
D000538:Aluminum Silicates; D000838:Anions; D002412:Cations; D002712:Chlorides; D006878:Hydroxides; D008670:Metals; D012996:Solutions; D003035:Cobalt; D008345:Manganese; D009532:Nickel; D000535:Aluminum; D007501:Iron; D008274:Magnesium; D015032:Zinc; D000077215:Clay