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Stable mesoporous zirconium-porphyrin framework for high-capacity, selective iodine capture from gas and water.

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Title: Stable mesoporous zirconium-porphyrin framework for high-capacity, selective iodine capture from gas and water.
Authors: Ni, Siqi1,2 (AUTHOR), Shaban, Muhammad1,2 (AUTHOR), Ren, Xuemei1 (AUTHOR), Chen, Changlun1 (AUTHOR) clchen@ipp.ac.cn
Source: Separation & Purification Technology. Mar2026, Vol. 383, pN.PAG-N.PAG. 1p.
Subjects: Iodine, Adsorption capacity, Mesoporous materials, Radioactive waste disposal, Environmental security, Metal-organic frameworks, Physical & theoretical chemistry, Water vapor
Abstract: Radioactive iodine isotopes such as 129I /131I present significant environmental and health risks due to their volatility, bioaccumulation, and long half-lives. In this study, we developed a mesoporous zirconium–porphyrin framework (Zr–TAPP) through coordination-driven self-assembly of Zr4+ ions and tetra-aminophenyl porphyrin ligands. This material features a thermally stable two-dimensional layered structure, where π-conjugated porphyrin rings and Lewis-acidic Zr O clusters provide numerous adsorption sites. Zr–TAPP achieves high iodine vapor uptake of 1.78 g/g at 75 °C through chemisorption, reducing I₂ to I₃− and immobilizing it via Zr N coordination and π-complexation. In aqueous solutions, it reaches a maximum iodide adsorption capacity of 303.8 mg/g at pH 7.0, driven by electrostatic attraction to protonated amino groups and porphyrin-mediated charge transfer. The adsorbent maintains 85 % of its capacity after five reuse cycles and shows strong selectivity over competing anions in aqueous solutions. Mechanistic analyses (the X-ray diffractometer and Raman spectroscopy) confirm a synergistic mechanism involving electron transfer, I₃− formation, and hydrogen bonding at protonated nitrogen centers. This study presents a robust, efficient dual-phase iodine adsorbent that offers a promising solution for nuclear waste remediation. [Display omitted] [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Radioactive iodine isotopes such as 129I /131I present significant environmental and health risks due to their volatility, bioaccumulation, and long half-lives. In this study, we developed a mesoporous zirconium–porphyrin framework (Zr–TAPP) through coordination-driven self-assembly of Zr4+ ions and tetra-aminophenyl porphyrin ligands. This material features a thermally stable two-dimensional layered structure, where π-conjugated porphyrin rings and Lewis-acidic Zr O clusters provide numerous adsorption sites. Zr–TAPP achieves high iodine vapor uptake of 1.78 g/g at 75 °C through chemisorption, reducing I₂ to I₃− and immobilizing it via Zr N coordination and π-complexation. In aqueous solutions, it reaches a maximum iodide adsorption capacity of 303.8 mg/g at pH 7.0, driven by electrostatic attraction to protonated amino groups and porphyrin-mediated charge transfer. The adsorbent maintains 85 % of its capacity after five reuse cycles and shows strong selectivity over competing anions in aqueous solutions. Mechanistic analyses (the X-ray diffractometer and Raman spectroscopy) confirm a synergistic mechanism involving electron transfer, I₃− formation, and hydrogen bonding at protonated nitrogen centers. This study presents a robust, efficient dual-phase iodine adsorbent that offers a promising solution for nuclear waste remediation. [Display omitted] [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2025.136173