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<p>In light of the considerable environmental challenges posed by water contamination, there is an imperative to identify adsorbents that exhibit both high capacity and efficiency. In this study, nitrogen-doped ZIF-8, triethylenetetramine (TETA), and magnetic activated carbon (m-AC) were combined to form a composite. By utilizing the amine functional groups of TETA to enhance chemical adsorption capacity and introducing magnetic separation properties to address the difficulty of recovering traditional adsorbents, a novel composite adsorbent, N-ZIF-8@TETA@m-AC, was successfully prepared. The adsorption kinetics follow a pseudo-second-order model, indicating that chemical adsorption is the rate-limiting step. Its primary mechanisms of action include electrostatic attraction, hydrogen bonding, and π-π stacking. The adsorption isotherms conform to the Freundlich isotherm model, suggesting multilayer adsorption on heterogeneous surfaces. The maximum adsorption capacity for malachite green reached 10172.9&#xa0;mg/g. Thermodynamic analysis further confirmed that this adsorption is a spontaneous endothermic process. Furthermore, the material exhibits excellent reusability, with a malachite green removal efficiency remaining above 85% after five consecutive cycles. The N-ZIF-8@TETA@m-AC composite demonstrates significant potential for environmental remediation, particularly in the efficient removal of organic dyes from wastewater.</p>

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TETA-Modified Magnetic N-ZIF-8 Enhances Malachite Green Adsorption: Adsorption Behavior and Mechanism

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Qiong Wu,
  • Hongyan Cheng,
  • Xiaochao Dang,
  • Yali Fang,
  • Weiwei Zhang,
  • Zongli Ren

摘要

In light of the considerable environmental challenges posed by water contamination, there is an imperative to identify adsorbents that exhibit both high capacity and efficiency. In this study, nitrogen-doped ZIF-8, triethylenetetramine (TETA), and magnetic activated carbon (m-AC) were combined to form a composite. By utilizing the amine functional groups of TETA to enhance chemical adsorption capacity and introducing magnetic separation properties to address the difficulty of recovering traditional adsorbents, a novel composite adsorbent, N-ZIF-8@TETA@m-AC, was successfully prepared. The adsorption kinetics follow a pseudo-second-order model, indicating that chemical adsorption is the rate-limiting step. Its primary mechanisms of action include electrostatic attraction, hydrogen bonding, and π-π stacking. The adsorption isotherms conform to the Freundlich isotherm model, suggesting multilayer adsorption on heterogeneous surfaces. The maximum adsorption capacity for malachite green reached 10172.9 mg/g. Thermodynamic analysis further confirmed that this adsorption is a spontaneous endothermic process. Furthermore, the material exhibits excellent reusability, with a malachite green removal efficiency remaining above 85% after five consecutive cycles. The N-ZIF-8@TETA@m-AC composite demonstrates significant potential for environmental remediation, particularly in the efficient removal of organic dyes from wastewater.