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<p>Developing sustainable, low-cost, durable, and recyclable catalysts for the degradation of hazardous organic pollutants remains a significant challenge. In this study, silver nanoparticles (AgNPs) were biosynthesized using <i>Peristrophe</i> leaf extract, which acted as both a reducing and stabilizing agent, and subsequently immobilized onto a hydroxyapatite-alginate hydrogel (HA–Alg) support for the catalytic reduction of 4-nitrophenol (4-NP) in the presence of NaBH<sub>4</sub>. Specifically, hydroxyapatite (HA) was prepared by calcining Pangasius bocourti bones under controlled conditions and combined with alginate to fabricate a green hydrogel-based carrier. This HA–Alg facilitated the uniform dispersion of AgNPs, enhanced catalytic performance, and enabled facile recovery and reuse. The physicochemical properties of the catalyst were characterized using XRD, EDS, FTIR, HR-TEM, and SAED analyses. The results revealed that AgNPs with an average size of 20.44 ± 5.22&#xa0;nm were uniformly distributed on the HA–Alg surface. Remarkably, the 35Ag/2HA–1Alg catalyst with an AgNP loading of &lt; 1% exhibited excellent catalytic activity under optimal conditions (4-NP/NaBH<sub>4</sub> molar ratio = 1/200), achieving ~ 95.0% 4-NP reduction within 4&#xa0;min, corresponding to a first-order rate constant (k) of 0.922&#xa0;min<sup>−1</sup>. After five catalytic cycles with simple filtration recovery, the catalyst retained nearly 50% conversion efficiency, demonstrating good stability. Notably, in a fixed bed column reactor, the catalyst completely degraded 2 L of 4-NP (20&#xa0;mg/L) within 45&#xa0;min, highlighting its strong potential for practical wastewater treatment applications.</p>

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Utilization of Pangasius Bocourti Bone-Derived Support Material in a Green Hydrogel Catalyst for the Removal of Organic Pollutants in Water

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Thanh Hau Pham,
  • Minh Thuan Vo,
  • Quang Tri Le,
  • Ba Long Do,
  • Thanh Gia Thien Ho,
  • Thi Be Ta Truong,
  • Tri Nguyen

摘要

Developing sustainable, low-cost, durable, and recyclable catalysts for the degradation of hazardous organic pollutants remains a significant challenge. In this study, silver nanoparticles (AgNPs) were biosynthesized using Peristrophe leaf extract, which acted as both a reducing and stabilizing agent, and subsequently immobilized onto a hydroxyapatite-alginate hydrogel (HA–Alg) support for the catalytic reduction of 4-nitrophenol (4-NP) in the presence of NaBH4. Specifically, hydroxyapatite (HA) was prepared by calcining Pangasius bocourti bones under controlled conditions and combined with alginate to fabricate a green hydrogel-based carrier. This HA–Alg facilitated the uniform dispersion of AgNPs, enhanced catalytic performance, and enabled facile recovery and reuse. The physicochemical properties of the catalyst were characterized using XRD, EDS, FTIR, HR-TEM, and SAED analyses. The results revealed that AgNPs with an average size of 20.44 ± 5.22 nm were uniformly distributed on the HA–Alg surface. Remarkably, the 35Ag/2HA–1Alg catalyst with an AgNP loading of < 1% exhibited excellent catalytic activity under optimal conditions (4-NP/NaBH4 molar ratio = 1/200), achieving ~ 95.0% 4-NP reduction within 4 min, corresponding to a first-order rate constant (k) of 0.922 min−1. After five catalytic cycles with simple filtration recovery, the catalyst retained nearly 50% conversion efficiency, demonstrating good stability. Notably, in a fixed bed column reactor, the catalyst completely degraded 2 L of 4-NP (20 mg/L) within 45 min, highlighting its strong potential for practical wastewater treatment applications.