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<p>Several technologies are used to mitigate the adverse effects of dyes on water resources, but the adsorption technique has been attracting special attention due to its high efficiency, low cost, and easy separation. In this scenario, the core objective of this research work is to evaluate the chemical modification of the sabiá bark in the removal of methylene blue dye in aqueous solution. The sabiá bark was acquired from Ipê Farm, in the municipality of Governador Dix-Sept Rosado, in the state of Rio Grande do Norte, Brazil. It was subsequently crushed, macerated, and classified by sieving. The bark powder underwent chemical modification with NaOH. The bioadsorbent was characterized by Scanning Electron Microscopy (SEM) and the Point of Zero Charge (PZC) technique, and subjected to pH, kinetic, and isothermal studies. The tests showed greater efficiency in basic media. The equilibrium time was reached in 30&#xa0;min. The Pseudo-2nd order kinetic model showed the best fit to the experimental data with a maximum adsorption capacity of 12.506&#xa0;mg·g<sup>−1</sup>. The Langmuir model, at 38&#xa0;°C, had the best fit, showing a maximum adsorption capacity of 148.213&#xa0;mg·g<sup>−1</sup> for the temperature of 38&#xa0;°C. Therefore, the bioadsorbent from the sabiá bark demonstrated promising results in the removal of the methylene blue dye.</p>

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Removal of Methylene Blue Dye in Aqueous Solution Using Chemically Modified Mimosa Caesalpiniifolia Bark

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Joalis Barbalho de Souza,
  • Lidiane Martins Moura Ferreira,
  • Ricardo Alan da Silva Vieira,
  • Levi Damasceno Bessa,
  • Nadeem Khan,
  • Francisco Klebson Gomes dos Santos,
  • Sabir Khan,
  • Rafael Rodolfo de Melo

摘要

Several technologies are used to mitigate the adverse effects of dyes on water resources, but the adsorption technique has been attracting special attention due to its high efficiency, low cost, and easy separation. In this scenario, the core objective of this research work is to evaluate the chemical modification of the sabiá bark in the removal of methylene blue dye in aqueous solution. The sabiá bark was acquired from Ipê Farm, in the municipality of Governador Dix-Sept Rosado, in the state of Rio Grande do Norte, Brazil. It was subsequently crushed, macerated, and classified by sieving. The bark powder underwent chemical modification with NaOH. The bioadsorbent was characterized by Scanning Electron Microscopy (SEM) and the Point of Zero Charge (PZC) technique, and subjected to pH, kinetic, and isothermal studies. The tests showed greater efficiency in basic media. The equilibrium time was reached in 30 min. The Pseudo-2nd order kinetic model showed the best fit to the experimental data with a maximum adsorption capacity of 12.506 mg·g−1. The Langmuir model, at 38 °C, had the best fit, showing a maximum adsorption capacity of 148.213 mg·g−1 for the temperature of 38 °C. Therefore, the bioadsorbent from the sabiá bark demonstrated promising results in the removal of the methylene blue dye.