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[Display omitted] • MOF-based wood air filters were prepared and applied to air filtration. • MOF particles were attached tightly to the wood channel matrix. • Compound air filters can effectively remove particulate matter. • The trapping mechanism of particulate matter by MOF in wood cavity was proposed. The severe indoor/outdoor air contamination caused by hazardous particulate matters (PMs) has a devastating impact on the environment and human health. Herein, air filters fabricated from delignified wood aerogels and metal–organic frameworks (MOFs) were used for PM removal. Two specially designed MOFs (i.e. Zn-based ZIF-L and Zr-based UiO-66-NH 2) were deposited into a highly porous wood matrix through in situ growth approach. The MOF crystals are attached tightly to the highly available cellulose surface groups and distributed uniformly. The integration of MOFs can regulate the aerogel morphology and surface property, leading to enhanced PM removal performance. Bare wood aerogels beard removal efficiencies of 70.7% and 75.0% for PM 2.5 and PM 10 , with a low-pressure drop of 15 Pa. By contrast, ZIF-L decorated wood aerogels exhibited PM 2.5 and PM 10 removal efficiencies of 97.6% and 99.5%, respectively, which are ascribed to the increased interception/impaction of PMs with the positively charged ZIF-L layer. While UiO-66-NH 2 functionalized wood aerogels demonstrated PM 2.5 and PM 10 removal efficiencies of 96.4% and 98.9% because of the hierarchical filter matrix and the presence of polar –NH 2 groups. Moreover, MOF modified wood aerogels can be easily regenerated and superior reusability can be achieved. This work provides an effective and economic strategy for the preparation of air filters from renewable materials. [ABSTRACT FROM AUTHOR]

Three-dimensional and lightweight carbon aerogels are promising for next-generation wearable devices. As the most abundant renewable resource on the planet, wood provides a green and sustainable raw material for the manufacture of lightweight and elastic carbon materials. Here, a simple and sustainable design is proposed to directly prepare elastic carbon aerogel with a layered structure from the wood. Zeolitic imidazolate framework (ZIF-L) was deposited on a wood aerogel matrix without lignin and hemicellulose by in situ growth. The presence of ZIF-L significantly reduced the volume shrinkage of aerogel during carbonization, and the carbonized ZIF-L improves the contact area and provides electron transport path. The prepared aerogel has a stress of 42 kPa under 80% strain, and the elastic strength and volume remain both above 98% after 200 times of compression, indicating that the aerogel has excellent compressibility and fatigue resistance. Based on this particular structural design, as-obtained aerogel shows excellent sensitivity as pressure sensors to detect subtle signals. In addition, the carbon aerogel can be directly assembled into a all-solid-state symmetric supercapacitor that show promising electrochemical performance and could be potential candidates for high-performance supercapacitors in wearable devices. [Display omitted] ● Carbonized wood aerogel was prepared via a top-down method. ● ZIF-L reduced the volume shrinkage of aerogel during carbonization. ● Carbonized wood aerogel has excellent elastic properties and fatigue resistance. ● Carbonized wood aerogel monitors physiological signals and energy storage. [ABSTRACT FROM AUTHOR]