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Preparation of a novel MOF@wood composites and their dye adsorption and flame retardant properties

花匠小妙招
2025-08-04 22:50

金属-有机骨架(MOF)晶体的实际应用通常受其粉末形态的限制。将天然轻木作为基体负载MOF颗粒,采用简便通用的生长策略成功制备了一系列新型MOF@木材(MOF=UiO-66,ZIF-8和ZIF-67)复合材料,并系统研究了其微观结构、阻燃性能及其对亚甲基蓝(MB)染料的吸附行为。研究结果表明,不同晶粒尺寸和形貌的MOF引入木材基体后,大量均匀分布在木材支架内的管腔表面并保持了其结晶度。其中,ZIF-8@木材具有更加优异的MB吸附能力,对MB的去除率为82.5%,最大吸附量可达210.9 mg·g-1。吸附过程符合伪二阶动力学模型,说明MOF@木材对MB的吸附主要为化学吸附。此外,UiO-66的掺入对木材基体早期热稳定性和炭层形成的影响优于ZIFs。相比于天然木材,UiO-66@木材的热释放峰值(PHRR)由94.5 W·g-1急剧降至36.5 W·g-1,总热释放量(THR)从7.7 kJ·g-1下降到5.4 kJ·g-1。同时,在800 ℃ 的炭化率显著提高了84.8%。本研究为设计和构筑功能化MOF@木材复合材料提供了新的途径,可能促进其在环境和绿色建筑等领域的应用。

Abstract

The practical application of metal-organic framework(MOF) crystals is commonly limited by their powder form. In this work, natural balsa wood was employed as substrate for dispersing and shaping MOF particles. A series novel MOF@wood (MOF=UiO-66,ZIF-8 and ZIF-67) composite were successfully fabricated by a facile in situ growth strategy. The microstructure, flame-retardant and methylene blue (MB) dye adsorption behavior of the obtained composite were investigated. The result indicated that the MOF microparticles with different grain sizes and morphologies were uniformly decorated on the lumen surface within the balsa wood scaffold,and MOF crystals maintained its crystallinity in the MOF@wood composite. The ZIF-8@wood composite displays highly removal efficiency up to 82.5%% for methylene blue and the adsorption capacity can reach 210.9 mg/g. Moreover, the adsorption process fits well with a pseudo second-order model, which confirms that the interaction between MOF@wood and MB is mainly controlled by chemical processes.In addition, the incorporation of UiO-66 MOF has better effect on thermal stability at the early stage and char layer formatting of wood substrate than ZIFs.Compared with the untreated wood, the peak of heat release rate of the UiO-66@wood composite exhibited a drastic decline from 94.5 W/g to 36.5 W/g and the total heat release from 7.7 kJ/g to 5.4 kJ/g. Meanwhile, the char residue rate of the UiO-66@wood at 800 ℃ is significantly increased by 84.8%.This work offers a new avenues for designing and constructing functionalized MOF@wood composite that may boost their environmental-and green building-related applications.

关键词

金属-有机骨架 /木材 /复合材料 /吸附 /阻燃{{custom_keyword}} /

Key words

metal organic framework / wood /composite /adsorption properties / flame retardant{{custom_keyword}} /

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