Confined Mg²⁺-Directed Interfacial Evolution of Primary Structural Units of Mg-MOF-74 on Platelet Clinoptilolite for CO₂/CH₄, CH₄/N₂, and CO₂/N₂ Separations.
- 1Beijing Key Laboratory for Green Catalysis and Separation, Beijing University of Technology, Beijing 100124, China.
Abstract
Controlling MOF nucleation on zeolite surfaces remains challenging when metal ions are freely supplied in solution, often resulting in poorly regulated interfaces. Herein, Mg²⁺-exchanged platelet clinoptilolite (Mg-PCP) was used as a confined metal source to direct the in situ growth of Mg-MOF-74-related sol-gel species (primary structural units, abbreviated as PSUs) without adding external Mg²⁺ salts. Using 2,5-dihydroxyterephthalic acid (DHTA) as a ligand, the structure features of the prepared PSU@Mg-PCPs revealed the progressive evolution of the disordered Mg-DHTA coordination species into locally ordered, unsaturated Mg-MOF-74-related interfacial subunits, accompanied by gradual interfacial roughening and coordination ordering. The evolving interfaces regulated the adsorption and separation behaviors of CO₂, CH₄, and N₂. At 298 K, PSU@Mg-PCP-10 exhibited apparent CO₂/CH₄ and CO₂/N₂ separation factors of 24.23 and 15.01, respectively, higher than those of Mg-PCP (7.83 and 9.01). Meanwhile, PSU@Mg-PCP-180 achieved the highest CO₂ uptake of 1.60 mmol g⁻¹ at 273 K. Grand canonical Monte Carlo simulations indicated that the separation behaviors originated from the combined effects of micropore blockage and preferential CO₂ adsorption at Mg²⁺ sites and newly formed interfacial regions. This confined-metal-source strategy provides a metal-efficient route for tailoring zeolite-MOF interfaces and tuning gas-separation performance.
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BibTeX
@article{sun2026confined,
title = {{Confined Mg²⁺-Directed Interfacial Evolution of Primary Structural Units of Mg-MOF-74 on Platelet Clinoptilolite for CO₂/CH₄, CH₄/N₂, and CO₂/N₂ Separations.}},
author = {Nan Sun and Tiejun Ma and Shengquan Liu and Tallat Munir and Bang Xu and Jihong Sun},
journal = {Gels (Basel, Switzerland)},
year = {2026},
month = oct,
doi = {10.3390/gels12100902},
url = {https://europepmc.org/article/MED/42929936},
note = {CC BY},
}
RIS
TY - JOUR
TI - Confined Mg²⁺-Directed Interfacial Evolution of Primary Structural Units of Mg-MOF-74 on Platelet Clinoptilolite for CO₂/CH₄, CH₄/N₂, and CO₂/N₂ Separations.
AU - Nan Sun
AU - Tiejun Ma
AU - Shengquan Liu
AU - Tallat Munir
AU - Bang Xu
AU - Jihong Sun
PY - 2026
DA - 2026/10/07
JO - Gels (Basel, Switzerland)
DO - 10.3390/gels12100902
UR - https://europepmc.org/article/MED/42929936
AB - Controlling MOF nucleation on zeolite surfaces remains challenging when metal ions are freely supplied in solution, often resulting in poorly regulated interfaces. Herein, Mg²⁺-exchanged platelet clinoptilolite (Mg-PCP) was used as a confined metal source to direct the in situ growth of Mg-MOF-74-related sol-gel species (primary structural units, abbreviated as PSUs) without adding external Mg²⁺ salts. Using 2,5-dihydroxyterephthalic acid (DHTA) as a ligand, the structure features of the prepared PSU@Mg-PCPs revealed the progressive evolution of the disordered Mg-DHTA coordination species into locally ordered, unsaturated Mg-MOF-74-related interfacial subunits, accompanied by gradual interfacial roughening and coordination ordering. The evolving interfaces regulated the adsorption and separation behaviors of CO₂, CH₄, and N₂. At 298 K, PSU@Mg-PCP-10 exhibited apparent CO₂/CH₄ and CO₂/N₂ separation factors of 24.23 and 15.01, respectively, higher than those of Mg-PCP (7.83 and 9.01). Meanwhile, PSU@Mg-PCP-180 achieved the highest CO₂ uptake of 1.60 mmol g⁻¹ at 273 K. Grand canonical Monte Carlo simulations indicated that the separation behaviors originated from the combined effects of micropore blockage and preferential CO₂ adsorption at Mg²⁺ sites and newly formed interfacial regions. This confined-metal-source strategy provides a metal-efficient route for tailoring zeolite-MOF interfaces and tuning gas-separation performance.
SN - 2310-2861
ER -