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Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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Updated: Jun 9, 2025

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

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Published on: February 27, 2021

Anchored Chitosan-Functionalized Magnetite Nanoparticles for Crystal Violet Decolorization from Aqueous Samples.

Mahsa Bandari¹, Mohsen Mohammadi Galangash¹, Shahab Shariati²

¹Department of Environmental Sciences and Engineering, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Guilan, Iran.

Combinatorial Chemistry & High Throughput Screening

|October 30, 2024

Summary

Silica-coated magnetite nanoparticles functionalized with 3-(triethoxysilyl)propyl isocyanate (TESPIC) effectively remove Crystal Violet (CV) dye. These reusable nanoparticles achieved 98.2% CV dye removal under optimized conditions, showing promise for water treatment.

Keywords:

Adsorption chitosan crystal violet magnetic nanoparticles organosilanes silica.

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Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

Area of Science:

Materials Science
Environmental Science
Nanotechnology

Background:

Fabrication of silica-coated magnetite nanoparticles (Fe3O4@SiO2-CS MNPs) functionalized with 3-(triethoxysilyl)propyl isocyanate (TESPIC).
Characterization of synthesized MNPs using XRD, FT-IR, SEM, and TEM.

Purpose of the Study:

Investigate the efficacy of Fe3O4@SiO2-CS-TESPIC MNPs for decolorizing Crystal Violet (CV) cationic dye.
Optimize dye removal efficiency using the Taguchi fractional factorial design method.

Main Methods:

Synthesis and characterization of Fe3O4@SiO2-CS-TESPIC MNPs.
Application of Taguchi L16 array for optimizing CV dye removal.
Analysis of adsorption kinetics and isotherms using pseudo-second-order and Freundlich models.
Comparison of isotherm models using MATLAB's fmincon function.

Main Results:

Achieved 98.2% CV dye removal under optimized conditions: 0.12 g adsorbent, pH 4, 0.05 mol L-1 NaCl, 30 min stirring.
Adsorption kinetics followed the pseudo-second-order model (R2 = 0.999).
Adsorption equilibrium was best described by the Freundlich isotherm model.
Demonstrated recyclability and reusability of the Fe3O4@SiO2-CS-TESPIC MNPs.

Conclusions:

Fe3O4@SiO2-CS-TESPIC MNPs are effective adsorbents for removing CV dye from aqueous solutions.
The study provides an optimized method for dye decolorization using functionalized magnetic nanoparticles.