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<p>Considering the environmental problems caused by harmful textile dyes, innovative methods for their effective removal and the protection of the ecosystems are need of the hour. The present study centres on the utilization of the newly developed double cross-linked polyvinyl alcohol and CaCO<sub>3</sub> composites for the efficient, adsorptive removal of harmful ionic textile dyes. Here in this work, the synthesis of PVA–CaCO<sub>3</sub> composites containing six different combinations of cross-linking agents was carried out. <?tk 1?>All the composites were thoroughly characterized by spectral, optical, analytical and thermal analysis methods and their efficacy in the adsorption of Methylene Blue dye was investigated with the help of UV-visible spectroscopy. Among the six composites tested, composite <b>P4</b>, which contains boric acid and maleic acid as cross-linking agents was found to be the best, exhibiting the adsorption efficiency of 82.6%. This composite is also found to efficiently remove other ionic dyes, i.e., Methyl Orange, Rosaline, and Eriochrome Black T. The kinetic experiments demonstrated that the adsorption process adheres to a pseudo-first-order kinetic (<i>k</i><sub>1</sub> = 0.0425&#xa0;m<sup>− 1</sup>) model with an adsorption capacity of 0.826&#xa0;mg/g. Additionally, the Langmuir model is the most appropriate adsorption isotherm model for this system with a Langmuir constant of 0.4263&#xa0;L/mg. Monitoring the temperature, concentration and pH dependency reveals that the adsorption process is endothermic and reaches its maximum at neutral pH. The adsorption mechanism is suggested to be instituted on the exchange of ions between charged centres.</p>

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Novel Double Cross-Linked Polyvinyl Alcohol–CaCO3 Composites for the Effective Removal of Ionic Textile Dyes

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Meenu Kumar,
  • Akash S. Kumar,
  • Naveen V. Kulkarni

摘要

Considering the environmental problems caused by harmful textile dyes, innovative methods for their effective removal and the protection of the ecosystems are need of the hour. The present study centres on the utilization of the newly developed double cross-linked polyvinyl alcohol and CaCO3 composites for the efficient, adsorptive removal of harmful ionic textile dyes. Here in this work, the synthesis of PVA–CaCO3 composites containing six different combinations of cross-linking agents was carried out. All the composites were thoroughly characterized by spectral, optical, analytical and thermal analysis methods and their efficacy in the adsorption of Methylene Blue dye was investigated with the help of UV-visible spectroscopy. Among the six composites tested, composite P4, which contains boric acid and maleic acid as cross-linking agents was found to be the best, exhibiting the adsorption efficiency of 82.6%. This composite is also found to efficiently remove other ionic dyes, i.e., Methyl Orange, Rosaline, and Eriochrome Black T. The kinetic experiments demonstrated that the adsorption process adheres to a pseudo-first-order kinetic (k1 = 0.0425 m− 1) model with an adsorption capacity of 0.826 mg/g. Additionally, the Langmuir model is the most appropriate adsorption isotherm model for this system with a Langmuir constant of 0.4263 L/mg. Monitoring the temperature, concentration and pH dependency reveals that the adsorption process is endothermic and reaches its maximum at neutral pH. The adsorption mechanism is suggested to be instituted on the exchange of ions between charged centres.