期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 8, 页码 4283-4287出版社
AMER CHEMICAL SOC
DOI: 10.1021/am300972z
关键词
flowerlike; magnesium oxide; nanostructure; heavy metal ion; adsorption; ion exchange
资金
- National Basic Research Program of China [2009CB930400, 2011CB933700]
- National Natural Science Foundation of China [NSFC 21121063]
- Chinese Academy of Sciences
- CSIRO [GJHZ1224]
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.
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