Synthesis of magnesium–aluminum layered double hydroxide intercalated with ethylene glycol by the aid of alkoxides

Effect of calcination on adsorption performance of Mg–Al layered double hydroxide prepared by a water-in-oil microemulsion method

“…This illustrates that the reconstruction structure of LDH-500 differs from that of the as-prepared LDH due to the different 20 intercalated balance-ions. Generally, adsorbents with high specific surface area, large pore volume and appropriate pore sizes perform well due to high 30 concentration of surface active sites that enhances adsorption of adsorbate molecules and facilitate their diffusion into the interior of adsorbents. Therefore, the pore structure and surface area of LDH and LDHs calcined under different temperature are investigated by N 2 adsorption-desorption measurements.…”

“…The loss of structure water and intercalated 20 ions would result in more porous microstructure of LDH-500 and/or larger specific surface area, which can be verified by the result of the nitrogen adsorption-desorption isotherms. 30 steps. For LDH, the loss in the first region from 50 to 150 °C is ca.…”

“…It can be observed that the LDH-500 and LDH-600 samples had the largest adsorption capacity, which was two times higher than that of the as-prepared LDH. The much larger O-II uptake is attributed to the larger specific surface areas and pore 30 volumes, and stong adsorption affinity of LDH-500 and LDH-600 resulted from their peculiarly structural reconstruction. O-II molecules were presumed to diffuse into the interior and interlayer structure of LDH-500 and LDH-600 reconstruction, which was accompanied by a longer equilibrium time and a 35 higher O-II uptake.…”

“…Preparation of calcined LDH: the as-prepared LDH was annealed in air at 300, 400, 500, 600 °C for 2 h at a heating rate 30 of 2 °C min -1 , and denoted as LDH-300, LDH-400, LDH-500 and LDH-600, respectively. Characterization X-ray diffraction (XRD) patterns of the samples were obtained using a Philips X'Pert powder X-ray diffractometer with Cu Kα 35 radiation (λ = 0.15419 nm).…”

“…have been used as adsorbents to remove dye pollutants from waste water. 7-11 However, the wide application of these aforementioned adsorbents is limited by their 30 relatively low adsorption capacities, difficult regeneration and/or high-cost. Therefore, it is still of great interest to fabricate environmentally compatible and efficient functional adsorbents for dye removal.…”