Combustion synthesis of porous MgO and its adsorption properties

Authors

• Songnan Li * ¹

• Modern Experiment Center, Harbin Normal University, Harbin, 150025, People’s Republic of China

Abstract

Porous magnesium oxide was synthesized by a combustion method, with Mg(NO₃)₂, ethylene glycol and deionized water as reactants, and characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and nitrogen sorption/desorption. The results showed that the as-prepared porous magnesium oxide has the multi-scale porous size with a large BET surface area of 203.8 m² g⁻¹. Magnesium oxides synthesized with other reactants have rod-shaped and granular morphologies, and their BET surface areas are 17.6 and 3.4 m² g⁻¹, respectively. Compared to the magnesium oxide with the low specific surface area, porous magnesium oxide exhibited higher adsorption efficiency with a maximum adsorption capacity of approximately 1088 mg g⁻¹ in removing Congo red. The as-synthesized porous magnesium oxide could be used as an efficient adsorption material in Congo red removal from the wastewater.

Keywords

• Combustion synthesis
• MgO
• Porous material
• Water Treatment