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<p>The objective of this study is to examine the potential of the calyx of <i>Physalis peruviana</i> (PPC) as a biosorbent for the removal of the highly toxic Crystal violet dye (CV) from aqueous solutions. In order to characterise the biosorbent, a series of analyses were conducted, including FTIR, SEM, EDX, and zero point of charge analyses. The compatibility of the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models was evaluated in order to assess the biosorption isotherms. The Langmuir isotherm model, which exhibited the highest correlation coefficient (R² = 0.930), was identified as the most accurate description of the biosorption process. At 25&#xa0;°C and a natural pH (4.8), the monolayer biosorption capacity was determined to be 144 mg g<sup>− 1</sup>. The biosorption kinetic mechanism was found to align with both the PSO. (R² = 0,943), and the IPD model (R² = 0,990). The thermodynamic parameters indicated that the biosorption process is heat-absorbing (ΔH°&gt;0) and spontaneous (ΔG°&lt;0), and results in an increase in entropy (ΔS°&gt;0). It was thus determined that biological waste PPC can be evaluated as a cost efficient, renewable and effective biosorbent in CV removal and as an alternative to other sorbents that have been previously reported.</p>

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Bioremoval of crystal violet dye from aqueous solutions using Physalis Peruviana calyx: mechanism, biosorption isotherms, kinetic modeling, and thermodynamic analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月23日

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  • Zehra Seba Keskin,
  • Zeynep Mine Şenol

摘要

The objective of this study is to examine the potential of the calyx of Physalis peruviana (PPC) as a biosorbent for the removal of the highly toxic Crystal violet dye (CV) from aqueous solutions. In order to characterise the biosorbent, a series of analyses were conducted, including FTIR, SEM, EDX, and zero point of charge analyses. The compatibility of the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models was evaluated in order to assess the biosorption isotherms. The Langmuir isotherm model, which exhibited the highest correlation coefficient (R² = 0.930), was identified as the most accurate description of the biosorption process. At 25 °C and a natural pH (4.8), the monolayer biosorption capacity was determined to be 144 mg g− 1. The biosorption kinetic mechanism was found to align with both the PSO. (R² = 0,943), and the IPD model (R² = 0,990). The thermodynamic parameters indicated that the biosorption process is heat-absorbing (ΔH°>0) and spontaneous (ΔG°<0), and results in an increase in entropy (ΔS°>0). It was thus determined that biological waste PPC can be evaluated as a cost efficient, renewable and effective biosorbent in CV removal and as an alternative to other sorbents that have been previously reported.