Kinetics of uptake of Cu2+ and Cd2+ by Mg–Al layered double hydroxides intercalated with citrate, malate, and tartrate

Ni–Al layered double hydroxides modified with citrate, malate, and tartrate: Preparation by coprecipitation and uptake of Cu2+ from aqueous solution

“…Recently, we examined citrateMg-Al LDH, malateMg-Al LDH, and tartrateMg-Al LDH, which have citrate (C 6 H 5 O 7 3 À ), malate (C 4 H 4 O 5 2 À ), and tartrate (C 4 H 4 O 6 2 À ), respectively, intercalated in the interlayer, and found that these LDHs rapidly took up heavy metal ions from aqueous solution at a constant pH of 5.0 [28][29][30]. For example, in the case of citrateMg-Al LDH, a citrate/Cu 2 þ ratio of 2.0 in the nitrate solution was sufficient to reduce an initial Cu 2 þ concentration of 1.0 mmol/L down to 0.09 mmol/L in 60 min.…”

Kinetics and equilibrium studies on the treatment of nitric acid with Mg–Al oxide obtained by thermal decomposition of NO3--intercalated Mg–Al layered double hydroxide

“…On the other hand, LDHs intercalated with ethylenediaminetetraacetate (EDTA) can take up heavy metal cations from aqueous solution [25]. Recently, we examined citrateÁMg-Al LDH, malateÁMg-Al LDH, and tartrateÁMg-Al LDH, which have citrate, malate, and tartrate, respectively, intercalated in the interlayer, and found that these LDHs rapidly took up heavy metal ions from aqueous solution [26][27][28]. As expressed in Eq.…”

Thermal decomposition behavior of Cu–Al layered double hydroxide, and ethylenediaminetetraacetate-intercalated Cu–Al layered double hydroxide reconstructed from Cu–Al oxide for uptake of Y3+ from aqueous solution

“…The uptake of heavy metal ions by LDHs intercalated with other chelating agents, such as mercaptocarboxylic, diethylenetriaminepentaacetic, meso-2,3-dimercaptosuccinic, and diethylenetriaminepentaacetic acids, has been also investigated [13][14][15]. LDHs intercalated with citrate, malate, and tartrate can also take up heavy metal ions from an aqueous solution [16][17][18].…”