Optimization of ZnS:CuS Nanocomposites for Enhanced Adsorption Efficiency

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Research has achieved significant milestones in developing nanocomposites with improved adsorption efficiency for dye-laden wastewater treatment. A team of scientists from COMSATS University Islamabad, in collaboration with researchers from Northern Border University, has conducted a comprehensive study to optimize zinc-copper sulfide (ZnS:CuS) nanocomposites. Their findings indicate that the optimized nanocomposites can effectively remove up to 96% of Reactive Black 5 (RB5) dye from aqueous solutions.

Key Takeaways:

  • The researchers found that the optimized nanocomposites achieved a minimum hydrodynamic size of 190 nm, a polydispersity index (PDI) of 0.37, and a zeta potential of -29.7 mV, confirming high stability.
  • Batch adsorption experiments demonstrated a maximum RB5 removal efficiency of 96% at pH 3, with adsorption equilibrium reached in 70 minutes.
  • The adsorption process followed the Langmuir isotherm model (R2 = 0.9996) with a maximum adsorption capacity (qmax) of 153 mg/g.
  • Kinetics were best described by the pseudo-second-order model (R2 = 0.96), indicating chemisorption.
  • The study highlights the potential of optimized ZnS:CuS nanocomposites as effective adsorbents for dye-laden wastewater treatment applications.

Statistics:

  • 96% maximum RB5 removal efficiency at pH 3
  • 70 minutes adsorption equilibrium time
  • 153 mg/g maximum adsorption capacity (qmax)
  • Langmuir isotherm model (R2 = 0.9996)
  • Pseudo-second-order model (R2 = 0.96)
  • Minimum hydrodynamic size of 190 nm
  • Polydispersity index of 0.37
  • Zeta potential of -29.7 mV

Sources:

  • Optimization of Zn-cu Sulfide Nanocomposites: a Systematic Study for Smaller Size, Enhanced Stability, and Reactive Black 5 Adsorption Efficiency. Colloid and Polymer Science, 2025.
  • NewsRx. Studies from COMSATS University Islamabad in the Area of Nanocomposites Reported (Optimization of Zn-cu Sulfide Nanocomposites: a Systematic Study for Smaller Size, Enhanced Stability, and Reactive Black 5 Adsorption Efficiency). Nanotechnology Weekly. August 25, 2025; p 1506.