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<p>Biogenic Fe (B-Fe) and Fe/Ni (B-Fe/Ni) nanoparticles were synthesized for uranium (VI) and chromium (VI) removal from aqueous solutions. B-Fe and B-Fe/Ni nanoparticles were more uniform in size, compared to chemically synthesized C-Fe and C-Fe/Ni. SEM imaging showed polydisperse B-Fe and B-Fe/Ni nanoparticles on the surface. Effect of solution pH, initial contaminant and adsorbent dosage on percent removal was investigated. Solution pH had a marginal effect on U(VI) and Cr(VI) sorption on B-Fe and B-Fe/Ni. A maximum of 78% U(VI) removal was observed at pH 9. For Cr(VI), near complete removal was observed at pH &lt; 6. Fast sorption kinetics with near complete removal using B-Fe within 30&#xa0;min was observed, for both U(VI) and Cr(VI). U(VI) sorption appeared to be irreversible adsorption via chemisorption, while it was physical sorption based mechanism for Cr(VI). The presence of organic molecules from plant extracts on the surface of B-Fe and B-Fe/Ni nanoparticles induced further coagulation of both U(VI) and Cr(VI). The rate of U(VI) sorption can best be described by pseudo second-order kinetics, and the rate constants were higher for chemically synthesized Fe, compared to B-Fe and B-Fe/Ni. For Cr(VI) sorption, biogenic B-Fe and B-Fe/Ni showed higher sorption rates. The maximum sorption capacities, determined by the Langmuir model, for U(VI) using B-Fe and B-Fe/Ni was 4.97 and 11.49&#xa0;mg/g, respectively. For Cr(VI), the maximum sorption capacities for B-Fe and B-Fe/Ni were 93.9 and 79.3&#xa0;mg/g, respectively. Biogenic synthesis of Fe and Fe/Ni nanoparticles was very effective in Cr(VI) and U(VI) removal.</p> Graphical abstract <p></p>

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Terminalia Bellirica Extract Mediated Synthesis of Fe and Fe/Ni Metal Oxide Nanoparticles for Chromium and Uranium Adsorption

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Gunarani G.I.,
  • Kishore Ramanan K.,
  • Santosh Srinivas N.,
  • Gautham B. Jegadeesan

摘要

Biogenic Fe (B-Fe) and Fe/Ni (B-Fe/Ni) nanoparticles were synthesized for uranium (VI) and chromium (VI) removal from aqueous solutions. B-Fe and B-Fe/Ni nanoparticles were more uniform in size, compared to chemically synthesized C-Fe and C-Fe/Ni. SEM imaging showed polydisperse B-Fe and B-Fe/Ni nanoparticles on the surface. Effect of solution pH, initial contaminant and adsorbent dosage on percent removal was investigated. Solution pH had a marginal effect on U(VI) and Cr(VI) sorption on B-Fe and B-Fe/Ni. A maximum of 78% U(VI) removal was observed at pH 9. For Cr(VI), near complete removal was observed at pH < 6. Fast sorption kinetics with near complete removal using B-Fe within 30 min was observed, for both U(VI) and Cr(VI). U(VI) sorption appeared to be irreversible adsorption via chemisorption, while it was physical sorption based mechanism for Cr(VI). The presence of organic molecules from plant extracts on the surface of B-Fe and B-Fe/Ni nanoparticles induced further coagulation of both U(VI) and Cr(VI). The rate of U(VI) sorption can best be described by pseudo second-order kinetics, and the rate constants were higher for chemically synthesized Fe, compared to B-Fe and B-Fe/Ni. For Cr(VI) sorption, biogenic B-Fe and B-Fe/Ni showed higher sorption rates. The maximum sorption capacities, determined by the Langmuir model, for U(VI) using B-Fe and B-Fe/Ni was 4.97 and 11.49 mg/g, respectively. For Cr(VI), the maximum sorption capacities for B-Fe and B-Fe/Ni were 93.9 and 79.3 mg/g, respectively. Biogenic synthesis of Fe and Fe/Ni nanoparticles was very effective in Cr(VI) and U(VI) removal.

Graphical abstract