Delignified wood filter functionalized with metal-organic frameworks for high-efficiency air filtration

Particulate matter (PM) pullution has emerged as a global concern. Herein, delignified wood functionalized with metal-organic frameworks (MOFs) was investigated for efficient PM removal. In particular, the lignin removal was realized by a deep-eutectic-solvent assisted process. By integrating three different MOFs into the porous wood matrix, wood-based filters with hierarchical structure were fabricated. The MOF particles including ZIF-8, MOF-199 and UiO-66 were deposited on the filters through in situ growth approach, thereby leading to a uniform MOF dispersion and strong wood-MOF adhesion. The ZIF-8 functionalized wood filter exhibited the highest PM removal performance, with PM2.5 and PM10 removal efficiencies of 89.8% and 91.6%, respectively. The superior PM capture ability of ZIF-8@Wood is attributed to the suitable surface property and sophisticated channels/pores. The gas transport pathways and PM capture mechanisms within wood filter were discussed in detail. This cost-effective and environmentally friendly filtration device provides a novel material platform for PM removal, and it could be extended for hazardous gas capture and volatile organic compound adsorption.

Automated summary

The study focuses on using delignified wood functionalized with metal-organic frameworks (MOFs) for efficient particulate matter (PM) removal, achieving high PM capture efficiency through the integration of various MOFs into the porous wood matrix. The resulting wood-based filters with hierarchical structure demonstrate superior PM removal performance and could potentially be applied for hazardous gas capture and volatile organic compound adsorption.