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<p>This study investigated the feasibility of preparing ceramsite from iron tailings for cadmium (Cd(II)) adsorption. Based on Si-Ca ceramsite compositional design, the Cd(II) adsorption mechanism of ceramsite fired in different preparation process were studied. The Cd(II) adsorption properties and pore structure were detected, and the phase composition and crystal morphology were investigated using XRD, DSC, BET, SEM–EDS and XPS. Results demonstrated that: the ceramsite sample No. 3 (fired at 1150&#xa0;°C for 30&#xa0;min) formed akermanite, gehlenite, and diopside phases. It achieved fast adsorption kinetics (80.79% removal in 2&#xa0;h) and high equilibrium capacity (95.57% removal in 21&#xa0;h) for Cd(II), with confirmed environmental safety. Adsorption followed pseudo-second-order kinetics and the Langmuir isotherm, indicating combined various processes dominated by chemisorption. The small aperture size (5.19&#xa0;μm) and high specific surface area (2.1&#xa0;m<sup>2</sup>/g) supported physical adsorption. The high-valent sulfur was reduced to S<sup>2−</sup> in preparation process for CdS chemical precipitation. The Cd(II) adsorption of the ceramsite sample No. 1-A through pore structure was mainly physical adsorption. The Cd(II) adsorption capacity of the ceramsite sample No. 1-I was deteriorated due to the change of pore structure caused by formation of forsterite ferroan. This work successfully repurposed iron tailings as a functional adsorption component, especially offering a novel strategy for valorizing high-sulfur iron tailings alongside other solid wastes.</p> Graphical abstract <p></p>

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Preparation and performance of iron tailings based porous ceramsite material for Cd(II) adsorption: evidence of the dominant action mechanism

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Shaoguang Hua,
  • Dejian Pei,
  • Huihui Zhou,
  • Guijian Liu,
  • Anqi Zhu

摘要

This study investigated the feasibility of preparing ceramsite from iron tailings for cadmium (Cd(II)) adsorption. Based on Si-Ca ceramsite compositional design, the Cd(II) adsorption mechanism of ceramsite fired in different preparation process were studied. The Cd(II) adsorption properties and pore structure were detected, and the phase composition and crystal morphology were investigated using XRD, DSC, BET, SEM–EDS and XPS. Results demonstrated that: the ceramsite sample No. 3 (fired at 1150 °C for 30 min) formed akermanite, gehlenite, and diopside phases. It achieved fast adsorption kinetics (80.79% removal in 2 h) and high equilibrium capacity (95.57% removal in 21 h) for Cd(II), with confirmed environmental safety. Adsorption followed pseudo-second-order kinetics and the Langmuir isotherm, indicating combined various processes dominated by chemisorption. The small aperture size (5.19 μm) and high specific surface area (2.1 m2/g) supported physical adsorption. The high-valent sulfur was reduced to S2− in preparation process for CdS chemical precipitation. The Cd(II) adsorption of the ceramsite sample No. 1-A through pore structure was mainly physical adsorption. The Cd(II) adsorption capacity of the ceramsite sample No. 1-I was deteriorated due to the change of pore structure caused by formation of forsterite ferroan. This work successfully repurposed iron tailings as a functional adsorption component, especially offering a novel strategy for valorizing high-sulfur iron tailings alongside other solid wastes.

Graphical abstract