Fabrication of Super Paramagnetic Nanoparticles by Sol-Gel Method for Water Purification

Abstract

Present work is focused on synthesis and characterization of super paramagnetic nanoparticles which showed a high adsorption capacity of dyes which are the first contaminant to be recognized in wastewater of different industries such as paper and textiles. One of these dyes is congo red which is an anionic diazo dye with two azo groups. Magnetite (Fe3O4) nanoparticles were prepared successfully by Sol–Gel method by using ferric nitrate (Fe (NO3)39H2O) and ethylene glycol (C2H6O2) as precursors which were annealed at different temperatures. The obtained nanoparticles were characterized by X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM) and Zeta Potential. The phase structures, particle sizes and morphologies of Fe3O4nanoparticles were determined by XRD and TEM. VSM shows the magnetic properties of nanoparticles. The results indicate that the obtained nanoparticles are single phase and the particle size and coercivity value of Fe3O4nanoparticles increased with the increase in annealing temperatures. Zeta Potential determined the surface charge of nanoparticles and the results show that nanoparticles can adsorb congo red. The adsorption capacity was evaluated using both the Langmuir and Freundlich adsorption isotherm models.

Magnetite (Fe3O4) nanoparticles for chromium removal

“…So it is significant that the synthesized particles mainly consist in magnetite nanoparticles. This result is also in conformation with the reported results (Shaker et al, 2013;Wang et al, 2013).…”

Effect of solvents on morphology, magnetic and dielectric properties of (α-Fe 2 O 3 @SiO 2 ) core-shell nanoparticles

“…Broad nature of the diffraction pattern is an indication of the smaller sized particles. The average crystalline size from the most intense peak of the XRD pattern was obtained using Scherrer's formula [37] . …”

Application of Magnetite (Fe3O4) Nanoparticles in Hexavalent Chromium Adsorption from Aquatic Solutions

“…There are various chemistry-based methods to synthesize nanoscaled magnetite (Fe 3 O 4 ) particles such as co-precipitation or precipitation, solution combustion, emulsion technique, hydrolysis and thermolysis of precursors, flow injection synthesis, sonochemical reaction and sol-gel. Sole-gel method has advantages in comparison with other techniques for examples: it can produce high purity nanoparticles because the organo-metallic precursor can be highly controllable, by solgel can provide a simple, economic, effective method to produce high quality nanoparticles and also ecofriendly procedure [8][9][10][11]. In this studied we synthesized magnetite nanoparticles via sol-gel method with super paramagnetic property for Cr (VI) removal from waste water.…”