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<p>The improper management of agricultural waste can produce particulate matter and greenhouse gases. This study explores a green synthesis approach in which mango peel extract rich in polyphenols is used to produce green nano zero-valent iron (G-NZVI). Furthermore, supporting G-NZVI with nanocellulose isolated from pineapple crown leaves (NCC) enhances the stability and dispersion of NZVI. X-ray diffractometry, zeta potential measurements, scanning electron microscopy with energy-dispersive X-ray spectroscopy, transmission electron microscopy, specific surface area analysis, and X-ray absorption near-edge spectroscopy were used to characterize the properties of the G-NZVI/NCC composites. The adsorption isotherm of arsenate (As<sup>5+</sup>) on G-NZVI/NCC demonstrated a maximum adsorption capacity of 5.488&#xa0;mg·g<sup>−1</sup>, which was higher than that of G-NZVI alone. The isotherm model indicated monolayer As<sup>5+</sup> adsorption on the homogeneous G-NZVI/NCC surface without lateral interactions between adsorbed molecules. The results revealed that low pH conditions, a high dosage of G-NZVI/NCC, and a low initial concentration of As<sup>5+</sup> increased the removal efficiency. The iron oxide layer of G-NZVI/NCC forms a strong surface complex, facilitating the formation of an inner sphere with As<sup>5+</sup> across a normal pH range and providing a cost-effective and eco-friendly solution for arsenic-contaminated water.</p>

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Utilization of agricultural waste: mango peels and pineapple crown leaves as precursors for nanomaterial production for arsenate remediation

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Ratthiwa Deewan,
  • Visanu Tanboonchuy,
  • Pummarin Khamdahsag,
  • Dickson Yuk-Shing Yan

摘要

The improper management of agricultural waste can produce particulate matter and greenhouse gases. This study explores a green synthesis approach in which mango peel extract rich in polyphenols is used to produce green nano zero-valent iron (G-NZVI). Furthermore, supporting G-NZVI with nanocellulose isolated from pineapple crown leaves (NCC) enhances the stability and dispersion of NZVI. X-ray diffractometry, zeta potential measurements, scanning electron microscopy with energy-dispersive X-ray spectroscopy, transmission electron microscopy, specific surface area analysis, and X-ray absorption near-edge spectroscopy were used to characterize the properties of the G-NZVI/NCC composites. The adsorption isotherm of arsenate (As5+) on G-NZVI/NCC demonstrated a maximum adsorption capacity of 5.488 mg·g−1, which was higher than that of G-NZVI alone. The isotherm model indicated monolayer As5+ adsorption on the homogeneous G-NZVI/NCC surface without lateral interactions between adsorbed molecules. The results revealed that low pH conditions, a high dosage of G-NZVI/NCC, and a low initial concentration of As5+ increased the removal efficiency. The iron oxide layer of G-NZVI/NCC forms a strong surface complex, facilitating the formation of an inner sphere with As5+ across a normal pH range and providing a cost-effective and eco-friendly solution for arsenic-contaminated water.