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

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...

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Bibliographic Details
Published inACS applied materials & interfaces Vol. 4; no. 8; pp. 4283 - 4287
Main Authors Cao, Chang-Yan, Qu, Jin, Wei, Fang, Liu, Hua, Song, Wei-Guo
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 22.08.2012
Subjects
Adsorption
Cadmium - chemistry
Cations
Dose-Response Relationship, Drug
Ions
Lead - chemistry
Magnesium Oxide - chemistry
Materials Testing
Metal Nanoparticles - chemistry
Microscopy, Electron, Scanning - methods
Microscopy, Electron, Transmission - methods
Microwaves
Nanostructures - chemistry
Nanotechnology - methods
X-Ray Diffraction - methods
heavy metal ion
nanostructure
adsorption
magnesium oxide
flowerlike
ion exchange
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Summary: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 N2 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.
ISSN:1944-8244
1944-8252
DOI:10.1021/am300972z