Eco-Friendly Hydrogel Beads from Seashell Waste for Efficient Removal of Heavy Metals from Water

The objective of this study is to develop a calcium carbonate-based adsorbent derived from seashells, incorporated into a sodium alginate matrix (Na-Alg@CTs) to form hydrogel beads, for the efficient removal of Cu (II) and Zn (II) heavy metals from aqueous solutions. XRD, SEM/EDS, and FTIR analysis...

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Bibliographic Details
Published in:Polymers 2024-11, Vol.16 (23), p.3257
Main Authors: Mchich, Zaineb, Stefan, Daniela Simina, Mamouni, Rachid, Saffaj, Nabil, Bosomoiu, Magdalena
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Calcium carbonate
Chemical properties
Chemisorption
Copper
Endothermic reactions
Experiments
Heavy metals
Hydrogels
Metal industry
Pesticides
Pollution
Scanning electron microscopy
Shellfish
Shells
Sodium
Sodium alginate
Spectrum analysis
Thermal properties
Thermodynamics
Zinc
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Summary:The objective of this study is to develop a calcium carbonate-based adsorbent derived from seashells, incorporated into a sodium alginate matrix (Na-Alg@CTs) to form hydrogel beads, for the efficient removal of Cu (II) and Zn (II) heavy metals from aqueous solutions. XRD, SEM/EDS, and FTIR analysis confirm the successful synthesis and characterization of the fabricated adsorbent. The adsorption study of Cu (II) and Zn (II) onto Na-Alg@CTs hydrogel beads revealed that the Langmuir model was the most suitable for characterizing the adsorption isotherms, suggesting monolayer coverage. Na-Alg@CTs exhibited a maximum Langmuir adsorption capacity of 368.58 mg/g and 1075.67 mg/g for Cu (II) and Zn (II), respectively. Additionally, the kinetics followed the pseudo-second-order model, indicating that the adsorption process is primarily governed by chemisorption. The thermodynamic study suggests that the uptake of metal ions on Na-Alg@CTs hydrogel beads is spontaneous and endothermic. The exceptional adsorption capacity, eco-friendly nature, and low-cost characteristics of Na-Alg@CTs hydrogel beads make them an ideal adsorbent for the removal of Cu (II) and Zn (II) from wastewater.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym16233257