Superb Adsorption Capacity and Mechanism of Flowerlike Magnesium Oxide Nanostructures for Lead and Cadmium Ions

Abstract

A facile method based on microwave-assisted solvothermal process has been developed to synthesize flowerlike MgO precursors, which were then transformed to MgO by simple calcinations. All the chemicals used (magnesium nitrate, urea, and ethanol) were low cost and environmentally benign. The products were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution TEM, and N(2) adsorption-desorption methods. These flowerlike MgO nanostructures had high surface area and showed superb adsorption properties for Pb(II) and Cd(II), with maximum capacities of 1980 mg/g and 1500 mg/g, respectively. All these values are significantly higher than those reported on other nanomaterials. A new adsorption mechanism involving solid-liquid interfacial cation exchange between magnesium and lead or cadmium cations was proposed and confirmed.

Synthesis of high surface area, mesoporous MgO nanosheets with excellent adsorption capability for Ni(II) via a distillation treating

“…Zhou et al [25] synthesized mesoporous MgO microspheres (S BET = 72.1 m 2 /g) with adsorption of phosphate (75.13 mg/g) via a simple precipitation and calcination method. Cao et al [26] obtained flowerlike MgO (S BET = 72 m 2 /g) based on microwave-assisted solvothermal process, which showed adsorption properties for Pb(II) and Cd(II) with maximum capacities of 1980 mg/g and 1500 mg/g, respectively. Li et al [27] synthesized plate-like nanometer MgO with adsorption of Congo-red (471-588 mg/g) by a hydrothermal reaction.…”

Equilibrium and kinetics of Safranin O dye adsorption on MgO decked multi-layered graphene

“…Activated carbon [1][2][3][4][5][6], carbon nanospheres [7] and MgO-loaded porous carbon [8] have been used as efficient adsorbents. MgO alone in different forms has been an excellent adsorbent [9][10][11][12][13][14][15][16][17][18]. This work is an effort to demonstrate a new material named 'MgO decked multi-layered graphene (MDMLG)' as an excellent adsorbent.…”

Cell Rescue by Nanosequestration: Reduced Cytotoxicity of An Environmental Remediation Residue, Mg(OH)2 Nanoflake/Cr(VI) Adduct

“…In addition to these incidental nanoparticle/pollutant adducts, millions of tons of such adducts are formed during environmental remediation, as nanotechnology is increasingly being applied in environmental engineering. 3,4 Chromium has been widely used in industry. 5 The worldwide environmental release of chromium-containing waste is over 40.8 million tons annually.…”