Abstract：
Dyes, as organic pollutants, are causing increasingly severe environmental problems. Metal-organic frameworks (MOFs) are considered promising dye adsorbents; however, their application is limited due to their powder or solid particle forms and limited reusability. Therefore, this study proposes an innovative approach to develop a novel MOF-based composite aerogel, specifically a HKUST-1/polyacrylonitrile nanofibers/regenerated cellulose (HKUST-1/PANNs/RC) composite aerogel adsorbent, for the adsorption of pollutants in water. This adsorbent was successfully prepared using a simple method combining covalent crosslinking, quick freezing, freeze-drying, in-situ growth synthesis, and solvothermal techniques. The HKUST-1/PANNs/RC composite aerogel exhibits a significantly large specific surface area, which is approximately 64 times greater than that of PANNs/RC (10.45 m2·g-1), with a specific surface area of 669.9 m2·g-1. The PANNs serve as a support framework, imparting excellent mechanical properties to the composite aerogel, enhancing its overall stability and recoverability. Additionally, the composite aerogel contains numerous -COOH and -OH groups on its surface, providing strong acid resistance and facilitating interactions with pollutant molecules through electrostatic interactions, π-π conjugation, n-π* interactions, and hydrogen bonding, thereby promoting the adsorption process. Using methylene blue (MB) as a probe molecule, the study results demonstrate that the HKUST-1/PANNs/RC composite aerogel has an adsorption capacity of 522.01 mg·g-1 for MB (25 h), exhibiting excellent adsorption performance. This composite aerogel shows great potential for application in water pollution control.
摘要：
染料,作为有机污染物，造成越来越严重的环境问题。金属有机骨架（MOFs）被认为是有前途的染料吸附剂;然而，由于它们的粉末或固体颗粒形式和有限的可重用性，它们的应用受到限制。因此,这项研究提出了一种创新的方法来开发一种新型的MOF基复合气凝胶，特别是HKUST-1/聚丙烯腈/再生纤维素（HKUST-1/PANNs/RC）复合气凝胶吸附剂，用于吸附水中的污染物。使用结合共价交联的简单方法成功地制备了该吸附剂,快速冷冻,冷冻干燥,原位生长合成，和溶剂热技术。HKUST-1/PANNs/RC复合气凝胶具有明显较大的比表面积，大约是PANNs/RC(10.45m2·g-1)的64倍，比表面积为669.9m2·g-1。PANN作为一个支持框架，赋予复合气凝胶优异的机械性能，增强其整体稳定性和可恢复性。此外,复合气凝胶在其表面含有许多-COOH和-OH基团，提供强耐酸性，并通过静电相互作用促进与污染物分子的相互作用，π-π共轭，n-π*相互作用，和氢键，从而促进吸附过程。使用亚甲蓝（MB）作为探针分子，研究结果表明，HKUST-1/PANNs/RC复合气凝胶对MB的吸附容量为522.01mg·g-1（25h），表现出优异的吸附性能。这种复合气凝胶在水污染控制中显示出巨大的应用潜力。
