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

Published online by Cambridge University Press:  11 May 2015

Xueming Liu ,
Chunge Niu ,
Xinping Zhen ,
Jide Wang  and
Xintai Su
Xueming Liu
Affiliation:
Ministry Key Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
Chunge Niu
Affiliation:
Petrochemical Research Institute, Karamay Petrochemical Company, Karamay, Xinjiang 83400, China
Xinping Zhen
Affiliation:
Petrochemical Research Institute, Karamay Petrochemical Company, Karamay, Xinjiang 83400, China
Jide Wang
Affiliation:
Ministry Key Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
Xintai Su*
Affiliation:
Ministry Key Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
*
a)Address all correspondence to this author. e-mail: suxintai827@163.com
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Abstract

A phase transfer method was developed to prepare Mg(OH)2 nanosheets and a subsequent adsorption–calcination process was followed to obtain lamellar MgO nanostructures. The as-prepared MgO nanosheets also showed a superior adsorption property of Congo red. Transmission electron microscopy and x-ray diffractometer results indicated that the as-obtained Mg(OH)2 was plate-shaped with a hexagonal crystal structure where MgO possessed a lamellar structure with a cubic phase. The maximum adsorption capacities of Mg(OH)2 and MgO were reached up to 1820 and 2650 mg g−1, respectively. The high adsorption capacity might be related to the particle geometry and large surface area (87.97 m2 g−1 for Mg(OH)2 and 132.31 m2 g−1 for MgO). The adsorbents can be easily regenerated for five times without any significant loss in their adsorption property. The adsorption behaviors of the Mg(OH)2 and MgO adsorbents showed that the adsorption kinetics and isotherms were in good agreement with pseudo-second-order rate equation and Freundlich adsorption model.

Keywords

phase transformationnanostructureadsorption
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1639 - 1647
Copyright
Copyright © Materials Research Society 2015 

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