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<p>This paper details the synthesis, characterization, and application of a green Y<sub>2</sub>O<sub>3</sub>@Chitosan (YCS) nanocomposite, fabricated using a simple technique, for the removal of Pb²⁺ ions from aqueous solutions. The synthesized YCS were analyzed employing several techniques to assess elemental composition, crystalline structure, surface properties, interlayer spacing, and functional groups. The substantial surface area of 67.4&#xa0;m² g⁻¹ facilitated the efficient adsorption of Pb²⁺ ions at starting metal ion concentrations ranging from 5.0 to 200&#xa0;mg. L<sup>− 1</sup>. The study examined an adsorption contact duration of 1440&#xa0;min, beginning solution pH levels of 1, 3 and 5 and an adsorbent dosage of 10&#xa0;mg. Adsorption experiments indicated that optimal elimination of Pb<sup>2+</sup> ions occurred within 63.5&#xa0;min after achieving adsorption equilibrium, with a maximum adsorption capacity of 247.2&#xa0;mg. g⁻¹ at pH 5.0, 10&#xa0;mg dose, at room temperature. The adsorption rate of Pb²⁺ ions conformed to the pseudo-second-order (PSO) kinetics, exhibiting a rate constant of about 6 × 10⁻⁴ g mg⁻¹. min⁻¹, an initial adsorption rate (h₀) of 5.12&#xa0;mg. g⁻¹ min⁻¹, and a half-life of ≈ 19&#xa0;min. The elemental mapping, EDS, and FT-IR investigations confirmed that the Pb<sup>2+</sup> ions adsorption by electrostatic interaction with the adsorbent’s –OH, –NH<sub>2</sub>, and –COOH functionalities. After four rounds of recycling, the composite maintained good stability and performance, with an adsorption efficiency of approximately 86.9%. The green Y<sub>2</sub>O<sub>3</sub>@Chitosan demonstrated good regeneration and reuse for Pb<sup>2+</sup> ions over four cycles without loss of adsorption competence, which was essential for an effective adsorbent.</p>

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Selective Adsorption of Lead (Pb²⁺) Ions from Contaminated Water via Y2O3 Modified Chitosan Adsorbent

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Laila S. Alqarni,
  • Mohamed N. Goda,
  • Fehaid Mohammed Alsubaie,
  • Alaa M. Younis,
  • Suzan Makawi,
  • Mukhtar Ismail,
  • A. Modwi

摘要

This paper details the synthesis, characterization, and application of a green Y2O3@Chitosan (YCS) nanocomposite, fabricated using a simple technique, for the removal of Pb²⁺ ions from aqueous solutions. The synthesized YCS were analyzed employing several techniques to assess elemental composition, crystalline structure, surface properties, interlayer spacing, and functional groups. The substantial surface area of 67.4 m² g⁻¹ facilitated the efficient adsorption of Pb²⁺ ions at starting metal ion concentrations ranging from 5.0 to 200 mg. L− 1. The study examined an adsorption contact duration of 1440 min, beginning solution pH levels of 1, 3 and 5 and an adsorbent dosage of 10 mg. Adsorption experiments indicated that optimal elimination of Pb2+ ions occurred within 63.5 min after achieving adsorption equilibrium, with a maximum adsorption capacity of 247.2 mg. g⁻¹ at pH 5.0, 10 mg dose, at room temperature. The adsorption rate of Pb²⁺ ions conformed to the pseudo-second-order (PSO) kinetics, exhibiting a rate constant of about 6 × 10⁻⁴ g mg⁻¹. min⁻¹, an initial adsorption rate (h₀) of 5.12 mg. g⁻¹ min⁻¹, and a half-life of ≈ 19 min. The elemental mapping, EDS, and FT-IR investigations confirmed that the Pb2+ ions adsorption by electrostatic interaction with the adsorbent’s –OH, –NH2, and –COOH functionalities. After four rounds of recycling, the composite maintained good stability and performance, with an adsorption efficiency of approximately 86.9%. The green Y2O3@Chitosan demonstrated good regeneration and reuse for Pb2+ ions over four cycles without loss of adsorption competence, which was essential for an effective adsorbent.