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Updated: Jul 8, 2026

Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
Improving synergistic effects within metal-organic framework by modulating structural interpenetration for boosted
Zhi-Yong Liu1, Tao An1, Kun Yu2
1School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang 222000, PR China.
Abstract:
Metal-organic frameworks (MOFs) have shown significant potential in the photocatalytic activation of peroxydisulfate (PDS). Although many MOFs have been investigated for their ability to activate PDS, the impact of structural interpenetration on this process remains underexplored. In this study, MIL-88D(Fe2Ni) and MIL-126(Fe2Ni) were selected to systematically study this effect. Both MOFs are composed of 4,4'-biphenyldicarboxylic acid and [Fe2NiO(COO)6] clusters (abbreviated as Fe2Ni), while the framework of MIL-126(Fe2Ni) can be considered as a two-fold interpenetrating MIL-88D(Fe2Ni) networks. The study shows that interpenetration not only enhances the structural rigidity and stability, but also facilitates the exposure of active sites. The structural interpenetration reduces the distance between Fe2Ni clusters to 0.6 nm, which is thermodynamically favorable for PDS activation. Consequently, the photocatalytic activation of PDS by MIL-126(Fe2Ni) is significantly promoted. The MIL-126(Fe2Ni)/PDS system achieved a 96.5 % removal efficiency of ofloxacin (OFL) within 30 min, with a high degradation rate constant (k) of 0.10 min-1. In addition, the MIL-126(Fe2Ni)/PDS system can effectively remove various organic pollutants from different water bodies, even under outdoor sunlight irradiation. Fascinatingly, MIL-126(Fe2Ni)@polyurethane sponges also can remove 98.4 % of OFL in 60 min, highlighting its potential for practical applications.
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