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<p>The selective separation of hexavalent chromium (Cr (VI)) from trivalent chromium (Cr (III)) has become a critical environmental priority due to the extreme toxicity, high mobility, and carcinogenic potential of Cr (VI), in stark contrast to the relatively low toxicity and biological significance of Cr (III). In this context, in this study, a novel polymer inclusion membrane (PIM) based on polysulfone (PSU) incorporating 10 wt% ethylenediaminetetraacetic acid (EDTA) as the extractant agent, was developed using the non-solvent induced phase separation (NIPS) technique to address this challenge. Comprehensive characterization by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), contact angle analysis, and thermogravimetric analysis (TGA) confirmed successful EDTA incorporation, resulting in enhanced hydrophilicity (contact angle reduced to 73°), high porosity (83.70%), and thermal stability up to 320&#xa0;°C. Batch extraction experiments demonstrated a remarkable selectivity, achieving 50% removal of Cr (VI) within 24&#xa0;h while maintaining Cr (III) extraction below 1.50%. Permeation experiments revealed higher diffusion coefficients for Cr (VI) (24.07 × 10⁻<sup>7</sup> cm<sup>2</sup>·s<sup>− 1</sup>) compared to Cr (III) (1.08 × 10⁻<sup>7</sup> cm<sup>2</sup>·s<sup>− 1</sup>) at 35&#xa0;°C. In addition, the lower activation energy for Cr (VI) (19.07&#xa0;kJ·mol<sup>− 1</sup>) relative to Cr (III) (25.41&#xa0;kJ·mol<sup>− 1</sup>) further highlights the membrane’s preferential affinity for Cr (VI). These findings demonstrate the strong potential of PSU-based PIM with 10 wt% EDTA as an efficient, sustainable, and selective solution for chromium speciation control in industrial wastewater, contributing to improved environmental safety and regulatory compliance.</p>

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PSU-EDTA polymer inclusion membrane for selective extraction of cr (VI) and cr (III) from aqueous solution

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Imane Mourtah,
  • Rachid Ouchn,
  • Ichraq El Yaakouby,
  • Yosra Raji,
  • Issam Mechnou,
  • Miloudi Hlaibi

摘要

The selective separation of hexavalent chromium (Cr (VI)) from trivalent chromium (Cr (III)) has become a critical environmental priority due to the extreme toxicity, high mobility, and carcinogenic potential of Cr (VI), in stark contrast to the relatively low toxicity and biological significance of Cr (III). In this context, in this study, a novel polymer inclusion membrane (PIM) based on polysulfone (PSU) incorporating 10 wt% ethylenediaminetetraacetic acid (EDTA) as the extractant agent, was developed using the non-solvent induced phase separation (NIPS) technique to address this challenge. Comprehensive characterization by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), contact angle analysis, and thermogravimetric analysis (TGA) confirmed successful EDTA incorporation, resulting in enhanced hydrophilicity (contact angle reduced to 73°), high porosity (83.70%), and thermal stability up to 320 °C. Batch extraction experiments demonstrated a remarkable selectivity, achieving 50% removal of Cr (VI) within 24 h while maintaining Cr (III) extraction below 1.50%. Permeation experiments revealed higher diffusion coefficients for Cr (VI) (24.07 × 10⁻7 cm2·s− 1) compared to Cr (III) (1.08 × 10⁻7 cm2·s− 1) at 35 °C. In addition, the lower activation energy for Cr (VI) (19.07 kJ·mol− 1) relative to Cr (III) (25.41 kJ·mol− 1) further highlights the membrane’s preferential affinity for Cr (VI). These findings demonstrate the strong potential of PSU-based PIM with 10 wt% EDTA as an efficient, sustainable, and selective solution for chromium speciation control in industrial wastewater, contributing to improved environmental safety and regulatory compliance.