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<p>This study focuses on the catalytic reduction of methylene blue (MB) dye using a hydrogel-based nanocomposite. A hydrogel (CNAM hydrogel) was synthesized via free radical polymerization using chitosan as the base material, acrylamide (AAm) and N-isopropyl acrylamide (NIPAM) as monomers, and N, N-methylene bisacrylamide (MBA) as a crosslinker. By varying MBA content, three grades of hydrogel were prepared. Cobalt oxide nanoparticles (Co₃O₄ NPs) were incorporated into the hydrogel matrix forming a nanocomposite (CNAM@Co₃O₄ NCs), which exhibited improved thermal stability and structural integrity, enhancing its catalytic reduction performance for MB dye removal. The materials were characterized using Fourier transform infrared (FTIR) spectroscopy, point of zero charge (ΔpH<sub>pzc</sub>) analysis, X-ray diffraction (XRD) analysis, Thermogravimetric (TG) analysis, Gel permeation chromatography (GPC) analysis, Scanning Electron Microscope (SEM), Energy dispersive X-ray (EDX) analysis, BET analysis, and Transmission electron microscopy (TEM) analysis. UV-Visible spectrophotometry was employed to quantitatively analyze the reduction of methylene blue (MB) dye. The Langmuir and Freundlich isotherm model fit best with adsorption kinetic data with adsorption capacity of 380.066&#xa0;mg/g. The equilibrium data followed Langmuir isotherm model, and adsorption process conformed to the intra-particle diffusion kinetic model. Additionally, the use of NaBH<sub>4</sub> as a reducing agent, enabled rapid reduction of the adsorbed MB dye, further demonstrating the nanocomposite’s catalytic efficiency. The CNAM@Co₃O₄ NCs exhibited a remarkable 95.28% MB dye reduction under optimal conditions. The CNAM@Co₃O₄ NCs shows significant promise for effective MB dye removal and has a promising potential in wastewater treatment applications.</p>

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Facile Synthesis of Cobalt Oxide-Doped Hydrogel Nanocomposite for Efficient Methylene Blue Dye Removal

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Utkarsh Rai,
  • Poorn Prakash Pande,
  • Shailja Rai,
  • Arbind Chaurasiya,
  • Aradhana Chaudhary,
  • Kopal Kashaudhan,
  • Divya Singh

摘要

This study focuses on the catalytic reduction of methylene blue (MB) dye using a hydrogel-based nanocomposite. A hydrogel (CNAM hydrogel) was synthesized via free radical polymerization using chitosan as the base material, acrylamide (AAm) and N-isopropyl acrylamide (NIPAM) as monomers, and N, N-methylene bisacrylamide (MBA) as a crosslinker. By varying MBA content, three grades of hydrogel were prepared. Cobalt oxide nanoparticles (Co₃O₄ NPs) were incorporated into the hydrogel matrix forming a nanocomposite (CNAM@Co₃O₄ NCs), which exhibited improved thermal stability and structural integrity, enhancing its catalytic reduction performance for MB dye removal. The materials were characterized using Fourier transform infrared (FTIR) spectroscopy, point of zero charge (ΔpHpzc) analysis, X-ray diffraction (XRD) analysis, Thermogravimetric (TG) analysis, Gel permeation chromatography (GPC) analysis, Scanning Electron Microscope (SEM), Energy dispersive X-ray (EDX) analysis, BET analysis, and Transmission electron microscopy (TEM) analysis. UV-Visible spectrophotometry was employed to quantitatively analyze the reduction of methylene blue (MB) dye. The Langmuir and Freundlich isotherm model fit best with adsorption kinetic data with adsorption capacity of 380.066 mg/g. The equilibrium data followed Langmuir isotherm model, and adsorption process conformed to the intra-particle diffusion kinetic model. Additionally, the use of NaBH4 as a reducing agent, enabled rapid reduction of the adsorbed MB dye, further demonstrating the nanocomposite’s catalytic efficiency. The CNAM@Co₃O₄ NCs exhibited a remarkable 95.28% MB dye reduction under optimal conditions. The CNAM@Co₃O₄ NCs shows significant promise for effective MB dye removal and has a promising potential in wastewater treatment applications.