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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

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Related Experiment Video

Updated: Dec 25, 2025

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability

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Published on: June 21, 2015

Uranium removal from mining water using Cu substituted hydroxyapatite.

Stephanie Szenknect¹, Adel Mesbah¹, Michael Descostes²

¹ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Bagnols/Cèze, France.

Journal of Hazardous Materials

|March 26, 2020

Summary

This summary is machine-generated.

Synthetic copper hydroxyapatite (Cu-Hap) effectively immobilizes uranyl from contaminated waters. This study demonstrates Cu-Hap

Keywords:

Copper substituted hydroxyapatite Meta-torbernite Mining water Remediation Uranium

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Published on: July 13, 2018

Area of Science:

Materials Science
Environmental Chemistry
Geochemistry

Background:

Hydroxyapatite (Hap) is a key material for contaminant remediation.
Uranium contamination in mining waters poses significant environmental risks.
Copper substitution in Hap may enhance uranyl immobilization properties.

Purpose of the Study:

To synthesize and characterize copper-substituted hydroxyapatite (Cu-Hap).
To evaluate the efficiency of Cu-Hap in immobilizing uranyl from aqueous solutions.
To elucidate the mechanisms of uranium removal by Cu-Hap under various conditions.

Main Methods:

Co-precipitation method for Cu-Hap synthesis.
Batch experiments contacting Cu-Hap with synthetic and real mining waters.
Analysis of solid phases using multiple techniques.
Geochemical simulations to determine uranium removal mechanisms.

Main Results:

Single-phased Cu-Hap synthesized with Cu incorporation up to xCu ≤ 1.59.
Rapid uranium concentration decrease observed in batch experiments.
Uranium removal equilibrium established within 1-4 days.
Diverse uranium removal mechanisms identified based on solution chemistry and Cu-Hap composition.

Conclusions:

Cu-Hap demonstrates significant potential for uranyl immobilization.
Cu-Hap facilitates meta-torbernite precipitation, a key uranium removal mechanism, especially at pH > 6.7.
Cu-Hap expands the applicability of hydroxyapatite for uranium remediation in complex water matrices.