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<p>In this study, Cu<sub>2</sub>O, CdS, and Cu<sub>2</sub>O decorated with CdS nanorods were successfully synthesized and applied for the adsorption of crystal violet (CV) dye. Cu<sub>2</sub>O had a cauliflower-like shape, while CdS underwent a phase transition from cubic to the hexagonal structure, forming nanorods anchored to the Cu<sub>2</sub>O surface. The Cu<sub>2</sub>O/CdS composite achieved the highest removal efficiency with 65% CV removal. Kinetic analysis revealed that the adsorption of CV onto CdS and Cu<sub>2</sub>O/CdS followed the pseudo-second order model, with a rate constant (k<sub>2</sub>) of 0.0268&#xa0;g&#xa0;mg⁻<sup>1</sup>&#xa0;min⁻<sup>1</sup>, indicating that chemisorption is the dominant mechanism. Equilibrium data were evaluated using the Langmuir and Freundlich isotherms, with the Freundlich model providing a superior fit (R<sup>2</sup> = 0.9522) and Freundlich constants​ of 17.969&#xa0;mg&#xa0;g⁻<sup>1</sup> and 19.5865&#xa0;mg&#xa0;g⁻<sup>1</sup> for CdS and Cu<sub>2</sub>O/CdS, respectively, suggesting heterogeneous multilayer adsorption as the governing mechanism. The enhanced performance of the Cu<sub>2</sub>O/CdS composite is attributed to the hierarchical morphological structure of Cu<sub>2</sub>O and the hexagonal structure of CdS. Overall, the results demonstrate that Cu<sub>2</sub>O/CdS is a promising adsorbent for removing dye from aqueous systems, offering high adsorption capacity, favorable kinetics, and heterogeneous adsorption behavior.&#xa0;</p> Graphical Abstract. Schematic Illustration Of Cv Adsorption Process Using Cu<sub>2</sub>O/CdS <p> Schematic illustration of CV adsorption process using Cu<sub>2</sub>O/CdS</p> <p></p>

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Cauliflower-like Cu2O decorated with CdS nanorod: characteristics and potential application for dye removal

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Desinta Dwi Ristiana,
  • Lathifah Puji Hastuti,
  • Saptarini,
  • Khansa Adinda Shafira,
  • Aida Udkhiyah,
  • Dinda Quratul Aini Irianto

摘要

In this study, Cu2O, CdS, and Cu2O decorated with CdS nanorods were successfully synthesized and applied for the adsorption of crystal violet (CV) dye. Cu2O had a cauliflower-like shape, while CdS underwent a phase transition from cubic to the hexagonal structure, forming nanorods anchored to the Cu2O surface. The Cu2O/CdS composite achieved the highest removal efficiency with 65% CV removal. Kinetic analysis revealed that the adsorption of CV onto CdS and Cu2O/CdS followed the pseudo-second order model, with a rate constant (k2) of 0.0268 g mg⁻1 min⁻1, indicating that chemisorption is the dominant mechanism. Equilibrium data were evaluated using the Langmuir and Freundlich isotherms, with the Freundlich model providing a superior fit (R2 = 0.9522) and Freundlich constants​ of 17.969 mg g⁻1 and 19.5865 mg g⁻1 for CdS and Cu2O/CdS, respectively, suggesting heterogeneous multilayer adsorption as the governing mechanism. The enhanced performance of the Cu2O/CdS composite is attributed to the hierarchical morphological structure of Cu2O and the hexagonal structure of CdS. Overall, the results demonstrate that Cu2O/CdS is a promising adsorbent for removing dye from aqueous systems, offering high adsorption capacity, favorable kinetics, and heterogeneous adsorption behavior. 

Graphical Abstract. Schematic Illustration Of Cv Adsorption Process Using Cu2O/CdS

Schematic illustration of CV adsorption process using Cu2O/CdS