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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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Related Experiment Video

Updated: Aug 27, 2025

Resource Recycling of Red Soil to Synthesize Fe2O3/FAU-type Zeolite Composite Material for Heavy Metal Removal

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Published on: June 2, 2022

Microporous Framework (Nb, Fe)-Silicate with Much Potential to Remove Rare-Earth Elements from Waters.

Zhi Lin¹, Daniela Tavares², Eduarda Pereira²

¹Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|September 27, 2022

Summary

A novel sodium-iron silicate nanoparticle was synthesized for rare-earth element removal. This material shows significant potential for efficiently extracting these valuable elements from aqueous solutions.

Keywords:

hydrothermal synthesis microporous niobium silicate rare earth removal silicate

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Published on: June 21, 2015

Area of Science:

Materials Science
Inorganic Chemistry
Environmental Science

Background:

The synthesis of novel porous materials is crucial for applications in separation and remediation.
Metal silicates with small pores offer unique properties for selective ion binding.
Previous research focused on rubidium-based silicates, necessitating exploration of sodium-based analogues.

Purpose of the Study:

To synthesize and characterize a new small-pore metal silicate nanoparticle.
To investigate the structural stabilization mechanism using iron doping.
To evaluate the material's efficacy in removing rare-earth elements from aqueous solutions.

Main Methods:

Hydrothermal synthesis of nanoparticles.
Structural characterization using X-ray diffraction and other techniques.
Ion-exchange assays for rare-earth element removal.

Main Results:

Successful synthesis of Na-Fe silicate nanoparticles with a structure analogous to Rb silicates.
Demonstrated framework stabilization through Fe3+ substitution at Nb5+ sites.
Exploratory assays showed considerable potential for rare-earth element removal.

Conclusions:

A new Na-Fe silicate material has been developed with potential applications in rare-earth element separation.
The partial substitution of Nb5+ by Fe3+ is key to stabilizing the silicate framework with smaller Na+ ions.
This material represents a promising candidate for environmental remediation and resource recovery of rare-earth elements.