Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
J Colloid Interface Sci. 2023 Jan;629(Pt A):182-188. doi: 10.1016/j.jcis.2022.08.144. Epub 2022 Aug 27.
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) 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 and PM, with a low-pressure drop of 15 Pa. By contrast, ZIF-L decorated wood aerogels exhibited PM and PM 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 functionalized wood aerogels demonstrated PM and PM removal efficiencies of 96.4% and 98.9% because of the hierarchical filter matrix and the presence of polar -NH 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.
危险颗粒物质（PMs）引起的严重室内/外空气污染对环境和人类健康造成了毁灭性的影响。在此，我们使用木质气凝胶和金属有机框架（MOFs）制备的空气过滤器来去除 PM。通过原位生长法将两种特别设计的 MOFs（即基于 Zn 的 ZIF-L 和基于 Zr 的 UiO-66-NH）沉积到高度多孔的木质基质中。MOF 晶体紧密附着在高可用性的纤维素表面基团上，并均匀分布。MOF 的集成可以调节气凝胶的形态和表面性质，从而提高 PM 的去除性能。裸木质气凝胶对 PM 和 PM 的去除效率分别为 70.7%和 75.0%，压降低至 15 Pa。相比之下，ZIF-L 修饰的木质气凝胶对 PM 和 PM 的去除效率分别为 97.6%和 99.5%，这归因于带正电荷的 ZIF-L 层对 PM 的增加拦截/冲击。而 UiO-66-NH 功能化的木质气凝胶对 PM 和 PM 的去除效率分别为 96.4%和 98.9%，这是由于分层过滤基质和存在极性 -NH 基团。此外，MOF 改性的木质气凝胶可以很容易地再生，并具有优异的可重复使用性。这项工作为从可再生材料制备空气过滤器提供了一种有效且经济的策略。
