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<p>Water contamination by heavy metals, including cobalt, presents a significant environmental challenge. Excessive cobalt levels can be toxic to aquatic life and may pose health risks to humans through bioaccumulation in the food chain. The purpose of this work addresses two main objectives. Firstly, it focuses on the use of amorphous calcium phosphate for the removal of cobalt ions from aqueous solutions. Secondly, synthesize pure cobalt phosphate octahydrate (Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O). The experimental method employed consists to introduce amorphous calcium phosphate to aqueous solutions of cobalt ions at room temperature and the mixture was stirred for variable treatment times. Several analytical techniques such as X-ray diffraction, Fourier Transform Infrared Spectroscopy, Scanning Electronic Microscopy, X-ray Photoelectron Spectroscopy, Inductively Coupled Plasma Spectroscopy, and Impedance Spectroscopy were employed. The results reveal a remarkable retention capacity of amorphous calcium phosphate (ACP) for Co<sup>2+</sup> ions, with an equilibrium uptake of approximately 288&#xa0;mg.g<sup>−1</sup>. This process is accompanied by the precipitation of pure cobalt phosphate octahydrate (Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O), confirming a transformation mechanism during cobalt removal. Moreover, the kinetic analysis demonstrates that the transfer of Co<sup>2+</sup> ions from the aqueous phase to the solid phosphate surface follows a pseudo-second-order model, suggesting that the overall process is governed by a dissolution–precipitation mechanism involving chemisorption interactions between cobalt and phosphate species. This process serves a dual purpose: purifying wastewater containing Co<sup>2+</sup> ions and enabling a new method to synthesize a pure cobalt phosphate octahydrate (Co<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>·8H<sub>2</sub>O) at low-temperature.</p>

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Dual functionality of amorphous calcium phosphate: efficient cobalt ion removal and controlled precipitation of cobalt phosphate octahydrate

  • 期刊论文

  • 发表日期：

    2026年5月31日

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  • B. Lizoul,
  • S. Kounbach,
  • A. Mortadi,
  • E. EL Hafidi,
  • A. Sbai,
  • Z. Lakbaibi,
  • E. Chahid,
  • E. Zahidi

摘要

Water contamination by heavy metals, including cobalt, presents a significant environmental challenge. Excessive cobalt levels can be toxic to aquatic life and may pose health risks to humans through bioaccumulation in the food chain. The purpose of this work addresses two main objectives. Firstly, it focuses on the use of amorphous calcium phosphate for the removal of cobalt ions from aqueous solutions. Secondly, synthesize pure cobalt phosphate octahydrate (Co3(PO4)2·8H2O). The experimental method employed consists to introduce amorphous calcium phosphate to aqueous solutions of cobalt ions at room temperature and the mixture was stirred for variable treatment times. Several analytical techniques such as X-ray diffraction, Fourier Transform Infrared Spectroscopy, Scanning Electronic Microscopy, X-ray Photoelectron Spectroscopy, Inductively Coupled Plasma Spectroscopy, and Impedance Spectroscopy were employed. The results reveal a remarkable retention capacity of amorphous calcium phosphate (ACP) for Co2+ ions, with an equilibrium uptake of approximately 288 mg.g−1. This process is accompanied by the precipitation of pure cobalt phosphate octahydrate (Co3(PO4)2·8H2O), confirming a transformation mechanism during cobalt removal. Moreover, the kinetic analysis demonstrates that the transfer of Co2+ ions from the aqueous phase to the solid phosphate surface follows a pseudo-second-order model, suggesting that the overall process is governed by a dissolution–precipitation mechanism involving chemisorption interactions between cobalt and phosphate species. This process serves a dual purpose: purifying wastewater containing Co2+ ions and enabling a new method to synthesize a pure cobalt phosphate octahydrate (Co3(PO4)2·8H2O) at low-temperature.