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<p>This study investigates the modification of polyacrylamide (PAM) nanofibers with silver nanoparticles (Ag) and green tea (GT) extract to enhance nitrate removal from landfill leachate collected in Kermanshah, Iran. GT extract was used to synthesize Ag nanoparticles, and 1 wt% of the resulting nanomaterials was added to an 11.7 wt% PAM solution before electrospinning. The fabricated membranes were characterized using scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), and Fourier-transform infrared spectroscopy (FTIR). Their hydrophilicity, water flux, and fouling resistance were also evaluated. Nitrate removal performance was optimized under varying flow rates, pH levels, and pressures using a design of experiments (DOE) approach. The PAM/Ag@GT membrane demonstrated enhanced properties, including reduced fiber diameter, increased porosity (from 26.2 to 58.6%), improved hydrophilicity, and decreased turbidity (from 32 to 3 NTU). Nitrate removal efficiency increased from 32 to 73.25%, with a leachate flux of 1850&#xa0;L/m²·h and a flux recovery ratio of 84.45%. Additionally, the PAM/Ag@GT membrane exhibited superior tensile strength and elongation compared to unmodified PAM. Under optimal conditions (0.2&#xa0;bar pressure, pH 7, and a flow rate of 120&#xa0;L/h), the PAM/Ag@GT membrane demonstrated efficient nitrate removal, enhanced overall performance, and promising potential for sustainable wastewater treatment applications.</p>

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Modified polyacrylamide nanofiber membrane for efficient nitrate removal from landfill leachate

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Maryam Moghadam,
  • Arash Dalvand,
  • Elham Arkan,
  • Habibeh Nasab,
  • Ali Asghar Ebrahimi

摘要

This study investigates the modification of polyacrylamide (PAM) nanofibers with silver nanoparticles (Ag) and green tea (GT) extract to enhance nitrate removal from landfill leachate collected in Kermanshah, Iran. GT extract was used to synthesize Ag nanoparticles, and 1 wt% of the resulting nanomaterials was added to an 11.7 wt% PAM solution before electrospinning. The fabricated membranes were characterized using scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), and Fourier-transform infrared spectroscopy (FTIR). Their hydrophilicity, water flux, and fouling resistance were also evaluated. Nitrate removal performance was optimized under varying flow rates, pH levels, and pressures using a design of experiments (DOE) approach. The PAM/Ag@GT membrane demonstrated enhanced properties, including reduced fiber diameter, increased porosity (from 26.2 to 58.6%), improved hydrophilicity, and decreased turbidity (from 32 to 3 NTU). Nitrate removal efficiency increased from 32 to 73.25%, with a leachate flux of 1850 L/m²·h and a flux recovery ratio of 84.45%. Additionally, the PAM/Ag@GT membrane exhibited superior tensile strength and elongation compared to unmodified PAM. Under optimal conditions (0.2 bar pressure, pH 7, and a flow rate of 120 L/h), the PAM/Ag@GT membrane demonstrated efficient nitrate removal, enhanced overall performance, and promising potential for sustainable wastewater treatment applications.