[Mg-Al]-LDH and [Zn-Al]-LDH as Matrices for Removal of High Loadings of Phosphate

Adsorption and Desorption Mechanisms of Rare Earth Elements (REEs) by Layered Double Hydroxide (LDH) Modified with Chelating Agents

“…This is a result consistent with the experimental finding that the complexation of EDTA improves the adsorption capacity of LDH. We note that the experimental results were shown for different adsorption efficiencies of phosphate anions on [Mg-Al]-LDH and [Zn-Al]-LDH [15]. The work concluded that the adsorption efficiency of the latter is larger than that of the former.…”

“…If this is the case, the replacement of Mg cations by Zn cations may lead to different adsorption efficiencies, shown in the present work, which originates from their different crystalline structures. We note that the experimental results were shown for different adsorption efficiencies of phosphate anions on [Mg-Al]-LDH and [Zn-Al]-LDH [15]. The work concluded that the adsorption efficiency of the latter is larger than that of the former.…”

“…The ability of LDH to intercalate anions makes them useful as catalysts, anion exchangers, and adsorbents. We note that several physicochemical models were proposed to rationalize the anion-exchange constants [15]. Some formalisms were derived by relating the activity of an anion to the anion-exchange constant [16], while geometric features of atoms, such as charge radii of the anions were taken into account to investigate the anion-exchange ability of halide anions on LDH [17].…”

Chemisorption and sustained release of cefotaxime between a layered double hydroxide and polyvinyl alcohol nanofibers for enhanced efficacy against second degree burn wound infection

“…2, spectrum a shows the FTIR spectrum of Zn-Al LDH, where the broad peak at 3454 cm À1 is attributed to O-H vibrations of H 2 O molecules and hydrogen bonding in -OH interlayer groups and a bending vibration at 1620 cm À1 . 47,48 The intense peak at 1365 cm À1 re-ected the symmetric and asymmetric stretching vibrations of a carbonate (CO 3 ) 2À , which may be formed during the sample preparation process. 37 The peaks that appeared below 700 cm À1 belonged to M-O bond stretching and brucite lattice bending.…”

Why nonconventional materials are answers for sustainable agriculture

“…74 However, these minerals frequently have CO 3 2− as exchangeable anion, which is hardly labile in mild conditions. The structure can be loaded with PO 4 3− , HPO 4 2− or H 2 PO 4 − by leaching with phosphoric acid, 75 but this process is (1)] fitting for different n values, where n = 0.5 represents a solution of Fick 1st law (simple diffusion through a permeable medium). Fitting is generally done using data until 60% of the maximum release (target 100%, i.e., M t /M eq = 1).…”