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<p>Industrial effluents from metallurgy, chemicals, and other sectors are major releasers of heavy metals polluting the environment. Within this study, chitosan (CS) and nanocellulose (NCs) were extracted from fish scales and coconut fiber, respectively, and co-precipitated in sodium alginate (ALG) solution to produce a biocomposite hydrogel (CS@NCs/ALG). The adsorptive efficiency of the new composite was determined for detoxification of 2 heavy metals (Hg<sup>2+</sup>, Zn<sup>2+</sup>) from aqueous solution. The main physicochemical properties of CS@NCs/ALG were characterized by application of spectroscopy (FTIR, XRD, SEM-EDX), with analytical methods including BET, TGA, pH<sub>PZC</sub>. The results show that CS@NCs/ALG exhibits a heterogenous and mesoporous structure with surface functional groups including -OH, -NH<sub>2</sub>, and -COOH groups. Removal tests indicated that the adsorption of these metals was strongly influenced by solution pH. Modelling of the adsorption results indicated best fits to the pseudo-second order kinetic and Langmuir isotherm models. High adsorption capacities (402.89 and 500.48 mg g<sup>− 1</sup>) were obtained for Hg<sup>2+</sup> and Zn<sup>2+</sup>. Thermodynamic analysis revealed that the adsorption of both ions was thermodynamically favorable, spontaneous, and accompanied by decreased randomness. These findings demonstrate that the hydrogel composite has high adsorption potential and can be effectively applied for bivalent heavy metal detoxification from contaminated aquatic systems.</p>

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Mercury (II) and Zinc (II) Detoxification from Aqueous Systems using Chitosan/Nanocellulose-based Biocomposite Hydrogel

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Bienvenu Iyedjolbo,
  • Constant Tcheka,
  • Narcisse Dobe,
  • Daouda Abia,
  • Donna Zra,
  • Marrigje Marianne Conradie,
  • Massaï Harouna,
  • Jeanet Conradie

摘要

Industrial effluents from metallurgy, chemicals, and other sectors are major releasers of heavy metals polluting the environment. Within this study, chitosan (CS) and nanocellulose (NCs) were extracted from fish scales and coconut fiber, respectively, and co-precipitated in sodium alginate (ALG) solution to produce a biocomposite hydrogel (CS@NCs/ALG). The adsorptive efficiency of the new composite was determined for detoxification of 2 heavy metals (Hg2+, Zn2+) from aqueous solution. The main physicochemical properties of CS@NCs/ALG were characterized by application of spectroscopy (FTIR, XRD, SEM-EDX), with analytical methods including BET, TGA, pHPZC. The results show that CS@NCs/ALG exhibits a heterogenous and mesoporous structure with surface functional groups including -OH, -NH2, and -COOH groups. Removal tests indicated that the adsorption of these metals was strongly influenced by solution pH. Modelling of the adsorption results indicated best fits to the pseudo-second order kinetic and Langmuir isotherm models. High adsorption capacities (402.89 and 500.48 mg g− 1) were obtained for Hg2+ and Zn2+. Thermodynamic analysis revealed that the adsorption of both ions was thermodynamically favorable, spontaneous, and accompanied by decreased randomness. These findings demonstrate that the hydrogel composite has high adsorption potential and can be effectively applied for bivalent heavy metal detoxification from contaminated aquatic systems.