Liu Xinru, Gu Jie, Cao Yongqi, Tan Liping, Liu Tongjun
Shandong Provincial Key Laboratory of Microbial Engineering, Department of Bioengineering, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Guangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Molecules. 2025 Feb 20;30(5):982. doi: 10.3390/molecules30050982.
Compared to conventional adsorbents, zinc-based metal-organic frameworks (MOFs) such as zeolite imidazolium skeleton-8 (ZIF-8) exhibit enhanced thermal, chemical, and structural stability. Nonetheless, their powdered form results in limited dispersibility in aqueous solutions and a tendency to aggregate, which significantly restricts their utility in adsorption applications. This study reports a green composite aerogel through the in situ mineralization of ZIF-8 onto bacterial cellulose (BC) for the effective removal of toxic metal ions (Cu) and Congo red (CR) from wastewater. The ZIF@BC composite aerogel was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area analysis. The findings indicated that the ZIF-8 produced were evenly distributed across the BC nanonetwork, facilitating effective adsorption of CR and Cu. The maximum adsorption capacities of the ZIF@BC aerogels were determined to be 397.55 mg/g for CR and 424.80 mg/g for Cu, as per the Langmuir isotherm. Furthermore, the ZIF-8@BC aerogels demonstrated excellent selectivity and reusability, particularly for CR adsorption. The proposed mechanism for the interaction between the composite aerogel and CR and Cu involves electrostatic interactions, hydrogen bonding, π-π bonding, coordination bonding, ion exchange, microchemical precipitation, and pore diffusion. This research offers significant promise for the utilization of MOF powders and highlights substantial industrial potential.
与传统吸附剂相比，锌基金属有机框架材料（MOFs），如沸石咪唑骨架-8（ZIF-8），具有更高的热稳定性、化学稳定性和结构稳定性。然而，它们的粉末形式在水溶液中的分散性有限且有聚集倾向，这显著限制了它们在吸附应用中的效用。本研究报道了一种通过将ZIF-8原位矿化到细菌纤维素（BC）上制备的绿色复合气凝胶，用于从废水中有效去除有毒金属离子（Cu）和刚果红（CR）。使用扫描电子显微镜、傅里叶变换红外光谱、热重分析、X射线衍射、X射线光电子能谱和比表面积分析对ZIF@BC复合气凝胶进行了表征。结果表明，生成的ZIF-8均匀分布在BC纳米网络中，有利于对CR和Cu的有效吸附。根据朗缪尔等温线，ZIF@BC气凝胶对CR和Cu的最大吸附容量分别为397.55 mg/g和424.80 mg/g。此外，ZIF-8@BC气凝胶表现出优异的选择性和可重复使用性，特别是对于CR吸附。复合气凝胶与CR和Cu之间相互作用的 proposed机制涉及静电相互作用、氢键、π-π键合、配位键合、离子交换、微化学沉淀和孔扩散。本研究为MOF粉末的利用提供了重要前景，并凸显了巨大的工业潜力。
