Synthesis and sulfate ion-exchange properties of a hydrotalcite-like compound intercalated by chloride ions

Synthesis of a novel layered double hydroxides [MgAl4(OH)12](Cl)2·2.4H2O and its anion-exchange properties

“…5i). Differently, common LDH materials with M 2+ /Al 3+ atomic ratios of 2-3 (M = Mg or Zn) showed preservation of layered structure after uptake of sulfate, nitrate, or bromate ions [20][21][22].…”

Removal of chloride ion from aqueous solution by ZnAl-NO3 layered double hydroxides as anion-exchanger

“…LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems [4][5][6]. Since the anion-exchange capability for LDHs are in the sequence CO 3 2− > SO 4 2− > OH − > F − > Cl − > Br − > NO 3 − > I − , the chloride ion can be exchanged with NO 3 -LDHs [1].…”

Layered Double Hydroxide Sorbents for Removal of Selenium from Power Plant Wastewaters

“…Since the CT blowdown in this particular test had higher concentrations of Se and S compared to the blowdown used for the larger diameter column tests, this feature was attributed to the higher sorption of these species in the LDH interlayers. Some evidence of peak splitting in the (003) and (006) reflections was also observed, which could indicate the presence of multiple anion species of different sizes inside the interlayer region [66,72]. Notably, no other crystalline phases were seen in any of the XRD patterns.…”