A solid-state chemical method for synthesizing MgO nanoparticles with superior adsorption properties

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Magnesium oxide (MgO) is a cost-effective adsorbent for wastewater treatment.
• Traditional MgO preparation methods are costly and environmentally harmful due to multistep processing and organic agents.

Purpose of the Study:

• To develop a simple, green, and scalable synthesis for MgO nanoparticles.
• To evaluate the adsorption performance of the synthesized MgO nanoparticles for Congo red removal.

Main Methods:

• A solid-state chemical route was employed to synthesize MgO nanoparticles.
• No liquid solvents, templates, or surfactants were used, ensuring a green process.
• Specific surface area and adsorption capacity were characterized.

Main Results:

• Small-sized MgO nanoparticles with a large specific surface area (213 m²/g) were successfully synthesized.
• The MgO nanoparticles exhibited a high adsorption capacity of 2375 mg/g for Congo red.
• Adsorption followed pseudo-second-order kinetics and the Langmuir isotherm model.

Conclusions:

• The developed solid-state synthesis is a green and scalable route for producing high-surface-area metal oxides.
• The synthesized MgO nanoparticles demonstrate excellent potential as efficient adsorbents for removing Congo red from wastewater.