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<p>Removing oxyanionic contaminants like arsenate (As(V)) and chromate (Cr(VI)) is challenging in water treatment because of their high mobility and toxicity. This study synthesised Fe–Cu bimetallic nanoparticles (BMNPs) via chemical reduction and characterised them to assess how composition affects pollutant removal. Structural analyses (SEM, TEM, XRD) showed heterogeneous nanoparticles with Fe<sup>0</sup>, Fe<sub>3</sub>O<sub>4</sub>, Cu<sup>0</sup>, and Cu₂O phases, indicating partially oxidised Fe–Cu interfaces. Adsorption kinetics for both oxyanions fit the pseudo-second-order model, suggesting surface interactions dominate removal. Equilibrium was described by the Langmuir model for single-component systems and the Freundlich model for multicomponent systems, indicating competitive adsorption. Thermodynamic analysis showed spontaneous interactions (ΔG° &lt; 0). Phosphate reduced As(V) retention, but Cr(VI) removal stayed efficient due to adsorption and partial reduction to Cr(III). The heterogeneous Fe–Cu structure affects adsorption and enables simultaneous removal of As(V) and Cr(VI) from water.</p>

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Decoding the interfacial synergy of Fe–Cu bimetallic nanoparticles for the concurrent removal of As(V) and Cr(VI)

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Karen Manquián-Cerda,
  • Tamara Maldonado,
  • Rubén Cuevas,
  • Raúl Calderón,
  • María Angélica Rubio,
  • Nicolás Arancibia-Miranda

摘要

Removing oxyanionic contaminants like arsenate (As(V)) and chromate (Cr(VI)) is challenging in water treatment because of their high mobility and toxicity. This study synthesised Fe–Cu bimetallic nanoparticles (BMNPs) via chemical reduction and characterised them to assess how composition affects pollutant removal. Structural analyses (SEM, TEM, XRD) showed heterogeneous nanoparticles with Fe0, Fe3O4, Cu0, and Cu₂O phases, indicating partially oxidised Fe–Cu interfaces. Adsorption kinetics for both oxyanions fit the pseudo-second-order model, suggesting surface interactions dominate removal. Equilibrium was described by the Langmuir model for single-component systems and the Freundlich model for multicomponent systems, indicating competitive adsorption. Thermodynamic analysis showed spontaneous interactions (ΔG° < 0). Phosphate reduced As(V) retention, but Cr(VI) removal stayed efficient due to adsorption and partial reduction to Cr(III). The heterogeneous Fe–Cu structure affects adsorption and enables simultaneous removal of As(V) and Cr(VI) from water.