Amino-Functionalized Fe₃O₄@SiO₂ Core-Shell Magnetic Nanoparticles for Dye Adsorption

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Core-shell nanoparticles offer unique properties for various applications.
• Fe3O4@SiO2 nanoparticles combine magnetic properties with a versatile silica shell.
• Functionalization of nanoparticles enhances their utility for specific tasks.

Purpose of the Study:

• To synthesize and characterize Fe3O4@SiO2 core-shell nanoparticles.
• To investigate the magnetic and optical properties of the functionalized nanoparticles.
• To evaluate the adsorption capabilities of these nanoparticles for common dyes.

Main Methods:

• Co-precipitation method for nanoparticle synthesis.
• Surface functionalization with amino groups (NH2).
• Characterization using X-ray, FT-IR, TEM, SAED, and VSM.
• Adsorption studies with methylene blue, Congo red, and eosin Y.

Main Results:

• Successfully synthesized Fe3O4@SiO2 nanoparticles with a ~6 nm silica shell.
• Confirmed amino functionalization via FT-IR.
• Observed high saturation magnetization in Fe3O4 nanoparticles.
• Demonstrated pseudo-second order kinetics and Langmuir isotherm for dye adsorption.
• Achieved maximum adsorption capacity for Congo red.

Conclusions:

• Fe3O4@SiO2 core-shell nanoparticles are effectively synthesized and functionalized.
• The nanoparticles possess favorable magnetic and adsorption properties.
• These nanoparticles show significant potential for dye removal from aqueous solutions.