Novel approach for the synthesis of Mg(OH)₂ nanosheets and lamellar MgO nanostructures and their ultra-high adsorption capacity for Congo red

Abstract

Abstract

A solid-state chemical method for synthesizing MgO nanoparticles with superior adsorption properties

“…This trend showed a linear increase up to a maximum value at 2375 mg g À1 within an adsorption time of 1 h and then slightly decreased at the initial concentration above 1200 mg L À1 . The superior maximum adsorption value of 2375 mg g À1 towards CR adsorption in solution at various initial concentrations in the range of 400-1400 mg L À1 for 1 h at natural pH and room temperature on the as-obtained MgO adsorbent was nearly equal to the reported superhigh adsorption capacity, 1,30 which was superior to that in most reports. 16,25,28,37 This showed that MgO nanoparticles prepared via the facile solvent-free chemical reaction manifested outstanding adsorption properties.…”

“…1c shows TEM and HRTEM images of the MgO nanoparticles with average particle diameters of approximately 10 nm, indicating a distinct lattice space of 0.21 nm, which corresponded well with the normal (200) plane, and was consistent with reported data. 30 MgO nanoparticles with an average diameter of about 10 nm had been successfully prepared by a facile solvent-free strategy using the reaction between Mg(OAc) 2 and H 2 C 2 O 4 . Compared with the particles size of MgO prepared using other synthetic methods in previous reports, the obtained MgO nanoparticles were much smaller, probably owing to the different microenvironment of the directcontact solid-state chemical reaction relative to solution synthesis.…”

“…29 Lamellar MgO nanostructures with alkaline surfaces have been successfully synthesized via hydrothermal synthesis, and demonstrated a superior adsorption performance towards Congo red solutions with an adsorption capacity of 2650 mg g À1 . 30 Other MgO nanomaterials with different morphologies have also been synthesized in solution. [25][26][27][28][29] However, their synthesis usually requires complex preparation processes owing to multistep synthetic operations under solution conditions, resulting in unnecessary environmental pollution from the organic agents.…”

Congo Red Dye Adsorption using Magnesium Hydroxide from Seawater Bittern

“…Liu et al [14] aimed a study on Mg(OH)2 as an adsorbent for methyl orange. Then the study by Liu et al [15] showed that the adsorption of congo red on Mg(OH)2 and MgO occurs through surface exchange until the surface function sites are fully occupied. The dye molecules are diffused for further adsorption reactions (complexation interactions).…”

Preparation and exceptional adsorption performance of porous MgO derived from a metal–organic framework

“…The maximum adsorption capacity of lamellar MgO can reach up to 2650 mg g À1 . 36 In despite of these achievements at present, the synthesis methods and the adsorption capacities of MgO need to be further improved.…”