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<p>Natural polymer sodium alginate (SA) has received much attention in water treatment due to its abundant active sites. However, single SA materials suffer from insufficient mechanical strength, and the traditional Ca²⁺ cross-linking method can partially mask active sites, thereby reducing adsorption capacity. In this study, porous ternary composite microparticles (SSC) were successfully prepared using sodium alginate as the matrix and introducing carboxymethyl cellulose and silica. The surface functional groups of SSC were identified using SEM, TGA, FTIR, XRD, and XPS. Adsorption experiments showed that the removal of Pb(II) follows pseudo-second-order kinetics, with a Langmuir maximum adsorption capacity of 48.049&#xa0;mg/g. The SSC maintained over 90% removal efficiency even after four regeneration cycles. Mechanism analysis indicated that the adsorption process is primarily chemical adsorption, involving synergistic effects of multiple mechanisms.</p>

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Study on the adsorption mechanism of Pb (II) from water by sodium alginate composite microparticles

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Hongbiao Zhou,
  • Ming Chen,
  • Xuan Liu,
  • Ru Li

摘要

Natural polymer sodium alginate (SA) has received much attention in water treatment due to its abundant active sites. However, single SA materials suffer from insufficient mechanical strength, and the traditional Ca²⁺ cross-linking method can partially mask active sites, thereby reducing adsorption capacity. In this study, porous ternary composite microparticles (SSC) were successfully prepared using sodium alginate as the matrix and introducing carboxymethyl cellulose and silica. The surface functional groups of SSC were identified using SEM, TGA, FTIR, XRD, and XPS. Adsorption experiments showed that the removal of Pb(II) follows pseudo-second-order kinetics, with a Langmuir maximum adsorption capacity of 48.049 mg/g. The SSC maintained over 90% removal efficiency even after four regeneration cycles. Mechanism analysis indicated that the adsorption process is primarily chemical adsorption, involving synergistic effects of multiple mechanisms.