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<p>The present study has focused on the development of multiple functional (carboxymethyl chitosan/alginate)-grafted polyacrylic acid composite (CMCH/ALG)-g-PAA with graphitic carbon nitride (ZnO-g-C<sub>3</sub>N<sub>4</sub>) as a high-potential filler in order to satisfy the increasing demands of recycling and separation problem of ZnO-g-C<sub>3</sub>N<sub>4</sub>, which is powdery sorbent and hard to recycle after adsorption and represents a secondary pollution with high-performance in addition to strong π-π stacking interactions between g-C<sub>3</sub>N<sub>4</sub> nanosheets can lead to serious agglomeration and restacking, which reduces g-C<sub>3</sub>N<sub>4</sub> adsorption activity. ZnO-g-C<sub>3</sub>N<sub>4</sub> nanosheets has been generated by traditional thermal condensation method and investigated by TEM, SEM, XRD, and FTIR. The investigation of ZnO-g-C<sub>3</sub>N<sub>4</sub>@ (CMCH/ALG)-g-PAA was done using FTIR, XRD, SEM, and TG. The highest swelling ratios of (CMCH/ALG)-g-PAA were 1697.10% at pH 8.0 and 140.5% in saline solution. Vigot and first order models fit the swelling capacity data. For (CMCH/ALG)-g-PAA with 3% ZnO-g-C<sub>3</sub>N<sub>4</sub>, the maximum adsorption capacity was 24.30&#xa0;mg/g at adsorbate concentration (0.1&#xa0;g/L), MB dye concentration (25&#xa0;mg/L), and pH 8.0. The practical data of adsorption was well being fitted by the Langmuir, Redlich-Peterson, and Sips models indicating complicated adsorption process. Since the Δ<i>G</i>◦ values are more than − 20&#xa0;kJ/mol, the adsorption is physisorption. ZnO-g-C<sub>3</sub>N<sub>4</sub>@ (CMCH/ALG)-g-PAA succeeded in effective dye removal from wastewater.</p>

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Boosting adsorption capacity of methylene blue dye by multiple functional ZnO-g-C3N4/ carboxymethyl chitosan/alginate –grafted polyacrylic acid composite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月10日

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  • Abeer S. A. Khalaf-Allah,
  • Maha Sultan,
  • Yasser K. Abdel-Monem,
  • Sabreen M. El-Gamasy,
  • Wael A. El-Sayed,
  • Ahmed M. Youssef

摘要

The present study has focused on the development of multiple functional (carboxymethyl chitosan/alginate)-grafted polyacrylic acid composite (CMCH/ALG)-g-PAA with graphitic carbon nitride (ZnO-g-C3N4) as a high-potential filler in order to satisfy the increasing demands of recycling and separation problem of ZnO-g-C3N4, which is powdery sorbent and hard to recycle after adsorption and represents a secondary pollution with high-performance in addition to strong π-π stacking interactions between g-C3N4 nanosheets can lead to serious agglomeration and restacking, which reduces g-C3N4 adsorption activity. ZnO-g-C3N4 nanosheets has been generated by traditional thermal condensation method and investigated by TEM, SEM, XRD, and FTIR. The investigation of ZnO-g-C3N4@ (CMCH/ALG)-g-PAA was done using FTIR, XRD, SEM, and TG. The highest swelling ratios of (CMCH/ALG)-g-PAA were 1697.10% at pH 8.0 and 140.5% in saline solution. Vigot and first order models fit the swelling capacity data. For (CMCH/ALG)-g-PAA with 3% ZnO-g-C3N4, the maximum adsorption capacity was 24.30 mg/g at adsorbate concentration (0.1 g/L), MB dye concentration (25 mg/L), and pH 8.0. The practical data of adsorption was well being fitted by the Langmuir, Redlich-Peterson, and Sips models indicating complicated adsorption process. Since the ΔG◦ values are more than − 20 kJ/mol, the adsorption is physisorption. ZnO-g-C3N4@ (CMCH/ALG)-g-PAA succeeded in effective dye removal from wastewater.