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Hierarchical wood aerogel as a macroscopic platform for MIL-101(Fe) to enable synergistic persulfate activation and oxytetracycline degradation
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DOI：10.1007/s10570-026-07166-1.png)
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Abstract
En 中文
Powdered metal organic frameworks (MOFs) face intrinsic challenges in stability, recovery, and processability, which limit their translation into practical water treatment systems. Here, we develop a macroscale Fe-based metal–organic framework (MIL-101(Fe)) based catalyst, MIL-101(Fe)@WA, fabricated through a facile in situ growth strategy that anchors MIL-101(Fe) in a distributed manner onto a sustainable, delignified cellulose wood-aerogel (WA) support. Leveraging the natural 3D microchannels and light-scattering properties of the cellulose, the resulting hierarchical composite exhibits improved 22d light absorption, and a narrowed bandgap (2.30–1.86 eV). This is accompanied by enhanced charge separation, as evidenced by reduced photoluminescence emission and lower charge-transfer resistance, supporting visible-light activation of peroxydisulfate (PS). Under optimized conditions, the MIL-101(Fe)@WA/PS/Vis system achieves 92.7% degradation of oxytetracycline (OTC) and maintains degradation efficiency ≥ 90% across a broad pH range (3–9). Unlike powder MOFs, the monolithic platform is manually retrievable and retains over 80.0% of its activity after six reuse cycles, supporting the mechanical robustness of the cellulose framework. Mechanistic analyses suggest a synergistic pathway in which photogenerated electrons support Fe3+/Fe2+ cycling, promoting PS activation and promoting the formation of multiple reactive species, including SO4·−, ·OH, and O2·− that contribute to OTC degradation. This work presents a design strategy for creating hierarchical catalysts, illustrating how functionalized cellulose aerogels can mitigate critical stability challenges of nanoscale MOFs in laboratory-scale catalytic systems.
Keywords:
Oxytetracycline degradation
MIL-101(Fe) metal–organic framework
Wood aerogel
Visible-light photocatalysis
Persulfate activation
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