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<p>In this study, Amaranth dye (AD) and chromium (VI) were extracted from aqueous solutions using a batch adsorption technique employing nickel oxide nanoparticles (NiO NPs) as adsorbents. The physical properties of the prepared NPs were characterized using Energy-dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction studies (XRD), UV-visible spectroscopy, Bandgap studies, and point of zero charge (pH pZC). Various parameters, including adsorbent concentrations (0.01–0.06&#xa0;g), pH (2–12), dye concentration (10–100&#xa0;mg/L), contact time (10–140&#xa0;min), and temperature (303&#xa0;K), were investigated to assess their impact on adsorption efficiency. The kinetic data followed by the pseudo-second-order model, and the Langmuir isotherm best described the adsorption behaviour at equilibrium, also including thermodynamic analysis. Adsorption capacity (qm) increased with contact time, and while pH had an inverse effect on Chromium(VI) adsorption, it enhanced Amaranth dye removal. The results demonstrate the potential of green-synthesized NiO NPs for effective dye and heavy metal removal.</p>

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Decoding the Mechanisms of Dyes and Heavy Metals via NiO Nanoparticles: Kinetic and Isothermal Perspectives

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • M. Mahadeva Swamy,
  • B. Roopashree,
  • Bincy Rose Vergis,
  • A. S. Sowmyashree,
  • D. Kathyayani

摘要

In this study, Amaranth dye (AD) and chromium (VI) were extracted from aqueous solutions using a batch adsorption technique employing nickel oxide nanoparticles (NiO NPs) as adsorbents. The physical properties of the prepared NPs were characterized using Energy-dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction studies (XRD), UV-visible spectroscopy, Bandgap studies, and point of zero charge (pH pZC). Various parameters, including adsorbent concentrations (0.01–0.06 g), pH (2–12), dye concentration (10–100 mg/L), contact time (10–140 min), and temperature (303 K), were investigated to assess their impact on adsorption efficiency. The kinetic data followed by the pseudo-second-order model, and the Langmuir isotherm best described the adsorption behaviour at equilibrium, also including thermodynamic analysis. Adsorption capacity (qm) increased with contact time, and while pH had an inverse effect on Chromium(VI) adsorption, it enhanced Amaranth dye removal. The results demonstrate the potential of green-synthesized NiO NPs for effective dye and heavy metal removal.