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<p>Recycled lithium-ion battery separators function as effective, regenerable sorbents for methylene blue (MB). Electrolyte exposure “activates” the polyethylene surface—introducing polar/anionic functionalities that enhance uptake relative to pristine-like regions. Equilibrium modeling confirms higher capacity on the electrolyte-enriched domain (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{q}_{\text{m}\text{a}\text{x}}=14.45\)</EquationSource> </InlineEquation> mg g⁻¹) compared with the low-electrolyte-contact fragment (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:q_{max}=4.7\)</EquationSource> </InlineEquation> mg g⁻¹). Van’t Hoff analysis indicates spontaneous, exothermic physisorption with ion-pairing/ion–dipole contributions, while kinetic fits (PFO/PSO, Elovich, Weber–Morris) reveal boundary-layer/heterogeneity effects governing the approach to equilibrium. The sorbent is readily regenerable by a mild acetone rinse and sustains ≥ 92% removal over ten cycles, underscoring a practical route to convert battery plastic waste into a low-cost, reusable adsorbent for wastewater remediation within a circular-economy framework.</p>

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Recycled battery separators as low-cost, selective, and reusable adsorbents for methylene blue

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Eric M. Garcia,
  • Hosane A. Taroco,
  • Julio O. F Melo

摘要

Recycled lithium-ion battery separators function as effective, regenerable sorbents for methylene blue (MB). Electrolyte exposure “activates” the polyethylene surface—introducing polar/anionic functionalities that enhance uptake relative to pristine-like regions. Equilibrium modeling confirms higher capacity on the electrolyte-enriched domain ( \(\:{q}_{\text{m}\text{a}\text{x}}=14.45\) mg g⁻¹) compared with the low-electrolyte-contact fragment ( \(\:q_{max}=4.7\) mg g⁻¹). Van’t Hoff analysis indicates spontaneous, exothermic physisorption with ion-pairing/ion–dipole contributions, while kinetic fits (PFO/PSO, Elovich, Weber–Morris) reveal boundary-layer/heterogeneity effects governing the approach to equilibrium. The sorbent is readily regenerable by a mild acetone rinse and sustains ≥ 92% removal over ten cycles, underscoring a practical route to convert battery plastic waste into a low-cost, reusable adsorbent for wastewater remediation within a circular-economy framework.