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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received November 8, 2025
Revised January 31, 2026
Accepted February 4, 2026
Available online July 25, 2026
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Latest issues
Robust NH₂-UiO-66 for Efficient Cr(VI) Sequestration from Water
https://doi.org/10.1007/s11814-026-00673-8
Abstract
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.
