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<p>The present study evaluates the potential of polyvinyl alcohol (PVA)/chitosan (CS)-Alumina bead as an adsorbent for Cu (II) ions removal from an aqueous solution. Detailed structural, morphological, thermal, crystal and, surface analysis of bead was examined utilizing Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffractogram (XRD) and Surface Area and Pore Size Analyzer, respectively. Batch adsorption experiments were conducted to investigate the effect of various factors such as initial copper concentration (25–200 ppm), contact time (0–600&#xa0;min), adsorbent dose (0.1–0.3&#xa0;g), pH of the solution (2–7) and temperature of the medium (25–45&#xa0;°C). The experimental findings demonstrated that under favorable conditions (pH of 5, time of 360&#xa0;min, adsorbent dose of 0.2, initial copper concentration of 25 ppm, and temperature of 45&#xa0;°C), the removal efficiency was found to be 96.5%. The Langmuir model exhibited R<sup>2</sup> value of 0.99, indicating a strong correlation between the model and experimental data. This finding suggest that maximum adsorption capacity is 80&#xa0;mg/g. The adsorption characteristics of the PVA/CS-Alumina bead were explained using a pseudo second-order kinetic model. The enthalpy change (18.90&#xa0;kJ/mol) and entropy change (0.131&#xa0;J/mol. K) were also determined from the temperature dependence, and the results demonstrated that the adsorption process is spontaneous and endothermic. The adsorption mechanism is explained by weak surface complexation and physical adsorption interactions as well as because the high surface area provides accessible active sites. The adsorbent showed good performance in the usability test, with 68.12% removal determined after the sixth usage. This finding indicated that PVA/CS-Alumina bead can be an effective material for the removal of copper.</p>

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Alumina-doped polyvinyl alcohol/chitosan beads for copper (II) adsorption: synthesis, characterization and performance study

  • 期刊论文

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  • 发表日期：

    2026年5月26日

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  • Mehtap Ozekmekci

摘要

The present study evaluates the potential of polyvinyl alcohol (PVA)/chitosan (CS)-Alumina bead as an adsorbent for Cu (II) ions removal from an aqueous solution. Detailed structural, morphological, thermal, crystal and, surface analysis of bead was examined utilizing Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffractogram (XRD) and Surface Area and Pore Size Analyzer, respectively. Batch adsorption experiments were conducted to investigate the effect of various factors such as initial copper concentration (25–200 ppm), contact time (0–600 min), adsorbent dose (0.1–0.3 g), pH of the solution (2–7) and temperature of the medium (25–45 °C). The experimental findings demonstrated that under favorable conditions (pH of 5, time of 360 min, adsorbent dose of 0.2, initial copper concentration of 25 ppm, and temperature of 45 °C), the removal efficiency was found to be 96.5%. The Langmuir model exhibited R2 value of 0.99, indicating a strong correlation between the model and experimental data. This finding suggest that maximum adsorption capacity is 80 mg/g. The adsorption characteristics of the PVA/CS-Alumina bead were explained using a pseudo second-order kinetic model. The enthalpy change (18.90 kJ/mol) and entropy change (0.131 J/mol. K) were also determined from the temperature dependence, and the results demonstrated that the adsorption process is spontaneous and endothermic. The adsorption mechanism is explained by weak surface complexation and physical adsorption interactions as well as because the high surface area provides accessible active sites. The adsorbent showed good performance in the usability test, with 68.12% removal determined after the sixth usage. This finding indicated that PVA/CS-Alumina bead can be an effective material for the removal of copper.