Issue 8, 2019

Ethylene glycol-assisted fabrication and superb adsorption capacity of hierarchical porous flower-like magnesium oxide microspheres for phosphate

Abstract

A series of hierarchical flower-like magnesium oxide (MgO) microspheres were prepared with an ethylene glycol (EG)-assisted route at room temperature using ammonia as a precipitating agent. Effects of the ethylene glycol (EG) ratio on the structure, morphology and pore properties were carefully investigated. The hierarchical porous MgO microsphere exhibited a surface area of 75 m2 g−1 and total pore area of 47.37 m2 g−1 at the highest ratio of EG (EG/Mg2+ = 10) in the reaction system. The prepared MgO microspheres exhibited an outstanding removal capacity of 574.71 mg g−1 for phosphate following the pseudo second order kinetic model (R2 = 0.99) and Langmuir isotherm model with the endothermic nature of phosphate adsorption which resulted from the high surface area and suitable pore size. Both the isothermal parameter RL between 0 and 1 and the negative the Gibbs free energy value suggested that phosphate adsorption on a MgO microsphere was a favorable process. Undoubtedly, this template-free mild synthesis method effectively promotes wide practical applications and mass scale production of porous MgO microsphere adsorption material.

Graphical abstract: Ethylene glycol-assisted fabrication and superb adsorption capacity of hierarchical porous flower-like magnesium oxide microspheres for phosphate

Article information

Article type
Research Article
Submitted
26 Mar 2019
Accepted
10 May 2019
First published
10 May 2019

Inorg. Chem. Front., 2019,6, 1952-1961

Ethylene glycol-assisted fabrication and superb adsorption capacity of hierarchical porous flower-like magnesium oxide microspheres for phosphate

S. Ahmed, J. Pan, M. N. Ashiq, D. Li, P. Tang and Y. Feng, Inorg. Chem. Front., 2019, 6, 1952 DOI: 10.1039/C9QI00331B

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