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<p>The increasing release of hazardous synthetic dye waste poses a serious threat to the environmental and human health. In this study, a novel ternary nanocomposite was designed as an innovative photo-responsive adsorbent by embedding poly silver molybdate (Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>) and alumina nanoparticles (Al<sub>2</sub>O<sub>3</sub>) into a sodium alginate (SA) polymeric matrix. Designed to efficiently eliminate methylene blue (MB) dye from contaminated water and overcome the separation bottleneck of traditional powdered materials. The SA/Al<sub>2</sub>O<sub>3</sub>/Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> microbeads were synthesized via a facile and eco-friendly ionotropic gelation method. Structural and morphological characterization of the prepared nanocomposite was authenticated via X-ray diffraction (XRD) and transmission electron microscopy (TEM), confirmed the successful formation of the ternary nanocomposite with particle size ranging from 10 to 12&#xa0;nm. The incorporation of Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> and Al<sub>2</sub>O<sub>3</sub> within the alginate polymer matrix significantly enhanced the photo-induced adsorption performance compared to bulk sodium alginate (SA) microbeads. Notably, 1.2&#xa0;g/L of the microbeads achieved a remarkable 91.78% removal efficiency for methylene blue (MB) dye (77.5 mg/g) within just 40&#xa0;min under visible light irradiation. In comparison, the nanocomposite demonstrates a significantly higher elimination compared to individual Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> and Al<sub>2</sub>O<sub>3</sub>, which exhibited only 60.69% and 56.89%, respectively. Kinetic studies revealed that the removal process obeyed the pseudo-second-order model, while the equilibrium data closely followed the Freundlich isotherm. Thermodynamic parameters confirmed that the photo-induced adsorption process is spontaneous and endothermic. Furthermore, the reusability of the SA/Al<sub>2</sub>O<sub>3</sub>/Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> microbeads was tested through five adsorption–desorption cycles, consistently removing more than 73.89% of MB dye. These results demonstrate the practical application of this photo-responsive nanocomposite as an easily recoverable and efficient solution for eliminating toxic cationic dyes from industrial wastewater.</p>

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Eco-friendly nanocomposite SA/Al2O3/Ag2Mo2O7 microbeads for fast and sustainable photo-induced adsorption of methylene blue dye from industrial wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Mohamed A. El-Damanhoury,
  • Ahmed H. Mangood,
  • Enas M. Abou-Taleb,
  • Ahmed M. Rashad,
  • Mohamed S. Hellal

摘要

The increasing release of hazardous synthetic dye waste poses a serious threat to the environmental and human health. In this study, a novel ternary nanocomposite was designed as an innovative photo-responsive adsorbent by embedding poly silver molybdate (Ag2Mo2O7) and alumina nanoparticles (Al2O3) into a sodium alginate (SA) polymeric matrix. Designed to efficiently eliminate methylene blue (MB) dye from contaminated water and overcome the separation bottleneck of traditional powdered materials. The SA/Al2O3/Ag2Mo2O7 microbeads were synthesized via a facile and eco-friendly ionotropic gelation method. Structural and morphological characterization of the prepared nanocomposite was authenticated via X-ray diffraction (XRD) and transmission electron microscopy (TEM), confirmed the successful formation of the ternary nanocomposite with particle size ranging from 10 to 12 nm. The incorporation of Ag2Mo2O7 and Al2O3 within the alginate polymer matrix significantly enhanced the photo-induced adsorption performance compared to bulk sodium alginate (SA) microbeads. Notably, 1.2 g/L of the microbeads achieved a remarkable 91.78% removal efficiency for methylene blue (MB) dye (77.5 mg/g) within just 40 min under visible light irradiation. In comparison, the nanocomposite demonstrates a significantly higher elimination compared to individual Ag2Mo2O7 and Al2O3, which exhibited only 60.69% and 56.89%, respectively. Kinetic studies revealed that the removal process obeyed the pseudo-second-order model, while the equilibrium data closely followed the Freundlich isotherm. Thermodynamic parameters confirmed that the photo-induced adsorption process is spontaneous and endothermic. Furthermore, the reusability of the SA/Al2O3/Ag2Mo2O7 microbeads was tested through five adsorption–desorption cycles, consistently removing more than 73.89% of MB dye. These results demonstrate the practical application of this photo-responsive nanocomposite as an easily recoverable and efficient solution for eliminating toxic cationic dyes from industrial wastewater.