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Published on: February 23, 2017
Cadmium fixation by synthetic hydroxyapatite in aqueous solution--thermal behaviour
David Marchat1, Didier Bernache-Assollant, Eric Champion
1Faculté des Sciences et Techniques, Science des Procédés Céramiques et de Traitements de Surfaces UMR CNRS 6638, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France. david.marchat@unilim.fr
Journal of Hazardous Materials
|April 8, 2006
Summary
Synthetic hydroxyapatite effectively immobilizes cadmium through a two-step process. This mechanism allows for both environmental decontamination and safe storage of cadmium using the same material.
Area of Science:
- Environmental Science
- Materials Science
- Chemistry
Background:
- Cadmium contamination poses significant environmental and health risks.
- Developing effective materials for cadmium remediation is crucial.
- Synthetic hydroxyapatite (HA) shows potential for heavy metal sequestration.
Purpose of the Study:
- To elucidate the mechanism of cadmium (Cd2+) uptake by synthetic hydroxyapatite (HA).
- To investigate the kinetics of cadmium fixation onto HA at different temperatures.
- To assess the suitability of HA for simultaneous cadmium decontamination and storage.
Main Methods:
- Batch experiments were conducted at 10°C and 50°C.
- Characterization of HA and cadmium-treated samples using ICP-AES, XRD, FT-IR, and electron microscopy.
- Thermal analysis (TGA, DTA, MS) and temperature-programmed X-ray diffraction were employed.
Main Results:
- Cadmium immobilization occurs in two distinct steps: surface substitution of Ca2+ by Cd2+ and subsequent bulk incorporation.
- Formation of a stable apatite solid solution containing cadmium.
- HA demonstrated effective cadmium sequestration under the tested conditions.
Conclusions:
- The study reveals a dual-step mechanism for cadmium immobilization by hydroxyapatite.
- The formation of a solid solution enables efficient cadmium decontamination and secure storage.
- Synthetic hydroxyapatite is a promising material for addressing cadmium pollution.
