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<p>The development of robust adsorbents for the efficient removal of toxic hexavalent chromium (Cr(VI)) from wastewater remains a critical challenge. Herein, an amino-functionalized metal-organic framework (NH₂-UiO-66) was synthesized via a solvothermal method and evaluated for the sequestration of Cr(VI). The synthesized NH₂-UiO-66 exhibited a hierarchical micro-mesoporous structure, originating from defects created during synthesis, a high specific surface area of 782.58&#xa0;m²·g⁻¹, and exceptional thermal stability. Adsorbent exhibited a maximum Langmuir adsorption capacity of 30.73&#xa0;mg·g⁻¹ for Cr(VI) at pH 6.0. The adsorption kinetics and isotherms were well-described by the pseudo-second-order (<i>R</i>² = 0.9952) and Langmuir models (<i>R</i>² = 0.9948), respectively, indicating a chemisorption-driven, monolayer process. Thermodynamic analysis revealed the adsorption to be endothermic and spontaneous. Notably, the adsorbent retained approximately 80% removal efficiency after five consecutive adsorption-desorption cycles, demonstrating excellent reusability. Importantly, PXRD pattern of the recycled material confirms its robust structural stability. FT-IR analysis confirmed that enhanced adsorption was primarily driven by strengthened electrostatic attraction between protonated amino groups and Cr(VI) anions, facilitated by defect-generated mesopores. Thus, NH₂-UiO-66 emerges as a highly promising and sustainable adsorbent for wastewater remediation.</p>

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Robust NH₂-UiO-66 for Efficient Cr(VI) Sequestration from Water

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Ruiming Zhao,
  • Lingling Li,
  • Yongqing Wang

摘要

The development of robust adsorbents for the efficient removal of toxic hexavalent chromium (Cr(VI)) from wastewater remains a critical challenge. Herein, an amino-functionalized metal-organic framework (NH₂-UiO-66) was synthesized via a solvothermal method and evaluated for the sequestration of Cr(VI). The synthesized NH₂-UiO-66 exhibited a hierarchical micro-mesoporous structure, originating from defects created during synthesis, a high specific surface area of 782.58 m²·g⁻¹, and exceptional thermal stability. Adsorbent exhibited a maximum Langmuir adsorption capacity of 30.73 mg·g⁻¹ for Cr(VI) at pH 6.0. The adsorption kinetics and isotherms were well-described by the pseudo-second-order (R² = 0.9952) and Langmuir models (R² = 0.9948), respectively, indicating a chemisorption-driven, monolayer process. Thermodynamic analysis revealed the adsorption to be endothermic and spontaneous. Notably, the adsorbent retained approximately 80% removal efficiency after five consecutive adsorption-desorption cycles, demonstrating excellent reusability. Importantly, PXRD pattern of the recycled material confirms its robust structural stability. FT-IR analysis confirmed that enhanced adsorption was primarily driven by strengthened electrostatic attraction between protonated amino groups and Cr(VI) anions, facilitated by defect-generated mesopores. Thus, NH₂-UiO-66 emerges as a highly promising and sustainable adsorbent for wastewater remediation.