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<p>The development of efficient and recyclable adsorbents for the removal of organic pollutants from wastewater remains an important environmental challenge. In this study, a novel ternary nanocomposite consisting of polyvinyl alcohol (PVA), graphene oxide (GO), and zeolitic imidazolate framework-67 (ZIF-67) was synthesized at room temperature and evaluated as an adsorbent for water purification. The nanocomposite (PVA/GO/ZIF-67) design combines the structural stability and hydrophilicity of PVA, the high surface area and oxygen-containing functional groups of GO, and the porous ZIF-67, resulting in enhanced adsorption performance. Structural and morphological characterization confirmed the incorporation and homogeneous distribution of all components within the composite matrix. The adsorption behavior of the PVA/GO/ZIF-67 was investigated using malachite green (MG) as a model dye pollutant. Under experimental conditions (adsorbent dosage of 0.004&#xa0;g, initial MG concentration of 20&#xa0;mg/L, natural pH (6), and 120&#xa0;min contact time), the composite achieved 97% dye removal with a maximum adsorption capacity of 981&#xa0;mg/g. Adsorption equilibrium was best described by the Langmuir isotherm model, while the kinetic data followed a pseudo-second-order model. The composite also exhibited good reusability, retaining 90% of its initial removal efficiency after three adsorption cycles. To assess its broader applicability, the nanocomposite adsorption performance was further evaluated toward tetracycline, a representative pharmaceutical contaminant. A removal efficiency of 70% was achieved, demonstrating the ability of the material to effectively remove structurally different pollutants. The combination of high adsorption capacity, satisfactory reusability, and broad-spectrum pollutant removal highlights the potential of the PVA/GO/ZIF-67 nanocomposite as a promising adsorbent for advanced wastewater treatment applications.</p>

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Room temperature synthesized PVA/GO/ZIF-67 ternary nanocomposite as a high-performance multifunctional adsorbent for malachite green and tetracycline removal

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Niyaz Mohammad Mahmoodi,
  • Bahaaddin Mahmoodi,
  • Hamid Hoseinzadeh,
  • Bagher Hayati,
  • Bahareh Rabeie,
  • Ramezan Ali Taheri

摘要

The development of efficient and recyclable adsorbents for the removal of organic pollutants from wastewater remains an important environmental challenge. In this study, a novel ternary nanocomposite consisting of polyvinyl alcohol (PVA), graphene oxide (GO), and zeolitic imidazolate framework-67 (ZIF-67) was synthesized at room temperature and evaluated as an adsorbent for water purification. The nanocomposite (PVA/GO/ZIF-67) design combines the structural stability and hydrophilicity of PVA, the high surface area and oxygen-containing functional groups of GO, and the porous ZIF-67, resulting in enhanced adsorption performance. Structural and morphological characterization confirmed the incorporation and homogeneous distribution of all components within the composite matrix. The adsorption behavior of the PVA/GO/ZIF-67 was investigated using malachite green (MG) as a model dye pollutant. Under experimental conditions (adsorbent dosage of 0.004 g, initial MG concentration of 20 mg/L, natural pH (6), and 120 min contact time), the composite achieved 97% dye removal with a maximum adsorption capacity of 981 mg/g. Adsorption equilibrium was best described by the Langmuir isotherm model, while the kinetic data followed a pseudo-second-order model. The composite also exhibited good reusability, retaining 90% of its initial removal efficiency after three adsorption cycles. To assess its broader applicability, the nanocomposite adsorption performance was further evaluated toward tetracycline, a representative pharmaceutical contaminant. A removal efficiency of 70% was achieved, demonstrating the ability of the material to effectively remove structurally different pollutants. The combination of high adsorption capacity, satisfactory reusability, and broad-spectrum pollutant removal highlights the potential of the PVA/GO/ZIF-67 nanocomposite as a promising adsorbent for advanced wastewater treatment applications.