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<p>It is essential to efficiently recover cadmium ion adsorbents to address the issue of environmental contamination. MOF (metal–organic framework) and COF (covalent organic framework) composites, with their multiple functional groups, are anticipated to show outstanding Cd(II) adsorption capabilities. The development of COF and MOF composite adsorbents that can effectively remove Cd(II) continues to be a complex task. Despite ongoing efforts, achieving high efficiency in Cd(II) adsorption with these composites presents significant obstacles. Crafting and refining these materials for superior Cd(II) extraction is an ongoing area of research. In this study, we synthesized a core–shell ZnGlu@Bth-TFPOT-COF (referred to as M@C) adsorbent via Schiff base reaction. adsorbent demonstrated remarkable properties, including excellent durability, specificity, and straightforward solid–liquid separation. Under 298 K and pH 6.0 conditions, M@C effectively adsorbed Cd(II), achieving a rapid elimination rate of 98.42% within 15 min. Remarkably, it effectively eliminated Cd(II) from a solution containing multiple ions, demonstrating an adsorption efficiency of 99.68% and a K<sub>d</sub> (partition coefficient) 3.11 × 10<sup>6</sup> mL/g in the presence of ten other ions. The adsorption process was controlled by the Freundlich isotherm model, and the pseudo-second-order kinetic model validated that multilayer chemisorption was the mechanism for removing Cd(II). Thermodynamic study showed that the removal process was both spontaneous and exothermic. M@C exhibited outstanding adsorption performance, achieving a capacity of 435.78 mg/g, and demonstrated exceptional selectivity. This characteristic renders the substance highly effective and discriminating in the adsorption of Cd(II), making it a superior choice for this purpose.</p>

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Advanced Cadmium Ion Capture with ZnGlu@Bth-TFPOT-COF Core–Shell Structure: Understanding the Adsorption Process, Efficacy, and Selectivity

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Mahmoud Zare-Shahi,
  • Mohsen Dehghani Ghanatghestani,
  • Farid Moeinpour,
  • Hossein Parvaresh

摘要

It is essential to efficiently recover cadmium ion adsorbents to address the issue of environmental contamination. MOF (metal–organic framework) and COF (covalent organic framework) composites, with their multiple functional groups, are anticipated to show outstanding Cd(II) adsorption capabilities. The development of COF and MOF composite adsorbents that can effectively remove Cd(II) continues to be a complex task. Despite ongoing efforts, achieving high efficiency in Cd(II) adsorption with these composites presents significant obstacles. Crafting and refining these materials for superior Cd(II) extraction is an ongoing area of research. In this study, we synthesized a core–shell ZnGlu@Bth-TFPOT-COF (referred to as M@C) adsorbent via Schiff base reaction. adsorbent demonstrated remarkable properties, including excellent durability, specificity, and straightforward solid–liquid separation. Under 298 K and pH 6.0 conditions, M@C effectively adsorbed Cd(II), achieving a rapid elimination rate of 98.42% within 15 min. Remarkably, it effectively eliminated Cd(II) from a solution containing multiple ions, demonstrating an adsorption efficiency of 99.68% and a Kd (partition coefficient) 3.11 × 106 mL/g in the presence of ten other ions. The adsorption process was controlled by the Freundlich isotherm model, and the pseudo-second-order kinetic model validated that multilayer chemisorption was the mechanism for removing Cd(II). Thermodynamic study showed that the removal process was both spontaneous and exothermic. M@C exhibited outstanding adsorption performance, achieving a capacity of 435.78 mg/g, and demonstrated exceptional selectivity. This characteristic renders the substance highly effective and discriminating in the adsorption of Cd(II), making it a superior choice for this purpose.