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<p>Iron oxide and its composite adsorbents are widely used for removing arsenic and other potentially toxic elements (PTEs) due to their affordability and eco-friendly properties. However, understanding their selectivity and storage stability is vital for their effective use in practical applications. Current work reports the selectivity behavior of a newly developed adsorbent, iron- and zirconium oxide nanoneedle-impregnated cellulose nanofibers (Fe-Zr-NN-CNF), toward cationic and anionic PTEs. Key findings are- (i) The adsorbent demonstrated exceptional selectivity for anionic potentially toxic elements (PTEs), achieving a removal efficiency of at least 98% across a broad pH range (2–9), while exhibiting minimal selectivity for cationic PTEs; (ii) The adsorbent effectively removed arsenite (As<sup>III</sup>) from aqueous media at a dosage of 1&#xa0;g L<sup>–1</sup> and pH 7.0. High phosphate concentrations hindered As<sup>III</sup> removal, whereas chloride, nitrate, and sulfate had negligible effects; (iii) Adsorption kinetics, isotherm studies, Fourier-transform infrared spectroscopy (FTIR), and X-ray absorption spectroscopy (XAS) analyses confirmed that As<sup>III</sup> adsorption follows a chemisorption mechanism, involving monolayer binding on a heterogeneous surface; and (iv) The adsorbent exhibited excellent storage stability for at least four weeks at both room temperature (25&#xa0;°C) and 40&#xa0;°C, indicating long-term usability in practical applications. Thus, the results suggest that Fe-Zr-NN-CNF could be a potential solution for water remediation strategies.</p>

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Iron- and Zirconium-Modified Nanocellulose Adsorbent: Broad-Range Selectivity Test for Potentially Toxic Elements and Effective Arsenite Removal

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Ratul Kumar Shil,
  • Ismail M. M. Rahman,
  • Yuto Sakai,
  • Moe Marumoto,
  • M. Mehedi Hasan Rocky,
  • Masaru Endo,
  • Kuo H. Wong,
  • Asami S. Mashio,
  • Hiroshi Hasegawa

摘要

Iron oxide and its composite adsorbents are widely used for removing arsenic and other potentially toxic elements (PTEs) due to their affordability and eco-friendly properties. However, understanding their selectivity and storage stability is vital for their effective use in practical applications. Current work reports the selectivity behavior of a newly developed adsorbent, iron- and zirconium oxide nanoneedle-impregnated cellulose nanofibers (Fe-Zr-NN-CNF), toward cationic and anionic PTEs. Key findings are- (i) The adsorbent demonstrated exceptional selectivity for anionic potentially toxic elements (PTEs), achieving a removal efficiency of at least 98% across a broad pH range (2–9), while exhibiting minimal selectivity for cationic PTEs; (ii) The adsorbent effectively removed arsenite (AsIII) from aqueous media at a dosage of 1 g L–1 and pH 7.0. High phosphate concentrations hindered AsIII removal, whereas chloride, nitrate, and sulfate had negligible effects; (iii) Adsorption kinetics, isotherm studies, Fourier-transform infrared spectroscopy (FTIR), and X-ray absorption spectroscopy (XAS) analyses confirmed that AsIII adsorption follows a chemisorption mechanism, involving monolayer binding on a heterogeneous surface; and (iv) The adsorbent exhibited excellent storage stability for at least four weeks at both room temperature (25 °C) and 40 °C, indicating long-term usability in practical applications. Thus, the results suggest that Fe-Zr-NN-CNF could be a potential solution for water remediation strategies.