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<p>This study recycled the polyethylene terephthalate (PET) bottles into copper-based metal-organic frameworks (Cu-MOF) and CuO@mesoporous carbon (CuO@MC) for the removal and spectrophotometric determination of Pigment Yellow dyes (P.Y.101 and P.Y.133). Characterization through XRD, FTIR, BET, SEM/EDX, and TGA confirmed their porosity, stability, and tailored surface chemistry. Under optimized conditions (pH 2.0, 10&#xa0;mg adsorbent dose, 120&#xa0;min contact time), Cu-MOF exhibited superior adsorption capacities of 740.7&#xa0;mg g⁻¹ for P.Y.101 and 666.6&#xa0;mg g⁻¹ for P.Y.133, whereas CuO@MC showed lower capacities of 370.3&#xa0;mg g⁻¹ for P.Y.101 and 578.0&#xa0;mg g⁻¹ for P.Y.133. The adsorption onto Cu-MOF and CuO@MC followed pseudo-second-order kinetics and Langmuir isotherm model. Thermodynamic analysis revealed a spontaneous and exothermic process, with excellent reusability (&gt; 95% efficiency after four cycles using 0.1&#xa0;mol L<sup>− 1</sup> NaOH regeneration). Real-wastewater applications achieved &gt; 95% recovery. Regarding the analytical performance, both adsorbents showed low detection limits (LOD) of 0.18–0.19&#xa0;mg L⁻¹ for P.Y. 101 and 0.33–0.34&#xa0;mg L⁻¹ for P.Y. 133. These findings highlight the excellent recycling and preparation of value-added materials from PET-bottle wastes. This work combined the environmental sustainability and the economic value of the method.</p> Graphical Abstract <p></p>

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Sustainable Removal and Determination of Pigment Yellow Dyes Using Cu-MOF and CuO@MC Derived from Polyethylene Terephthalate Bottles Wastes

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Asmaa Halima,
  • Magdi E. Khalifa,
  • Nasser Mohammed Hosny,
  • Wael I. Mortada

摘要

This study recycled the polyethylene terephthalate (PET) bottles into copper-based metal-organic frameworks (Cu-MOF) and CuO@mesoporous carbon (CuO@MC) for the removal and spectrophotometric determination of Pigment Yellow dyes (P.Y.101 and P.Y.133). Characterization through XRD, FTIR, BET, SEM/EDX, and TGA confirmed their porosity, stability, and tailored surface chemistry. Under optimized conditions (pH 2.0, 10 mg adsorbent dose, 120 min contact time), Cu-MOF exhibited superior adsorption capacities of 740.7 mg g⁻¹ for P.Y.101 and 666.6 mg g⁻¹ for P.Y.133, whereas CuO@MC showed lower capacities of 370.3 mg g⁻¹ for P.Y.101 and 578.0 mg g⁻¹ for P.Y.133. The adsorption onto Cu-MOF and CuO@MC followed pseudo-second-order kinetics and Langmuir isotherm model. Thermodynamic analysis revealed a spontaneous and exothermic process, with excellent reusability (> 95% efficiency after four cycles using 0.1 mol L− 1 NaOH regeneration). Real-wastewater applications achieved > 95% recovery. Regarding the analytical performance, both adsorbents showed low detection limits (LOD) of 0.18–0.19 mg L⁻¹ for P.Y. 101 and 0.33–0.34 mg L⁻¹ for P.Y. 133. These findings highlight the excellent recycling and preparation of value-added materials from PET-bottle wastes. This work combined the environmental sustainability and the economic value of the method.

Graphical Abstract