Synthesis and physicochemical characterization of Zn/Al chloride layered double hydroxide and evaluation of its nitrate removal efficiency

Hierarchically porous NiAl-LDH nanoparticles as highly efficient adsorbent for p-nitrophenol from water

“…It is worth noting that theoretic maximum absorption capacity of p-nitrophenol for Ni 4 Al-LDH samples has reached to 77.7 mg/g. Essential features of the Langmuir isotherm can be expressed in terms of a dimensionless equilibrium parameter [49].…”

Arsenate removal from aqueous solution by cellulose-carbonated hydroxyapatite nanocomposites

“…Pseudo-first-order equation was employed to analyze the kinetic data since it allows evaluating effective adsorption capacity and the rate constant of the kinetic model without any parameters beforehand [43][44][45][46][47]. The pseudofirst-order Lagergren equation is shown as Eq.…”

“…(3) and (4), respectively]. Langmuir isotherm model assumes a monolayer surface coverage limiting the adsorption due to the surface saturation, while Freundlich isotherm model is an empirical model allowing for multilayer adsorption [47].…”

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

“…Actually, some studies have reported the potential use of LDHs as adsorbents or reservoirs of nitrate. [9,10,[13][14][15][16][17][18] However, the selectivity of LDHs for nitrate is generally considered not to be high, and a large number of studies have reported that anions with a higher charge density tend to be more preferentially intercalated into LDHs. [6][7][8]19,20] According to a report by Miyata, [19] the order of exchange selectivity for monovalent anions in the case of Mg-Al LDHs (Mg/ Al = 2.3) is OH -> F -> Cl -> Br -> NO 3 -> I -, and according to a report by Costa et al, [20] the order of exchange selectivity based on a computational simulation with Zn-Al LDHs (Zn/Al = 2) is CO 3 2-> OH -> F -> Cl -> Br -> NO 3 -.…”