Graphene Oxide Modified UiO-66 Based Metal Organic Framework Gel: Preparation and Efficient Toluene Adsorption Performance

Volatile organic compounds (VOCs), particularly aromatic hydrocarbons such as toluene, pose significant threats to the environment and human health due to their high volatility and biological toxicity. Traditional metal- organic frameworks (MOFs) are primarily microporous, and their trade-off between adsorption capacity and molecular transport efficiency has driven development of more advanced material systems. In this work, graphene oxide (GO) doped metal-organic framework gels (MOGs) based on UiO-66 were developed, leveraging the synergistic modification effect of GO. The π-conjugated structure of GO enhanced π-π interactions with toluene molecules, while its abundant oxygen-containing functional groups facilitated competitive coordination with metal nodes, leading to exposure of additional Lewis acid sites and thereby enhancing metal-π interactions. Experimental results demonstrated that UG-1 with a mass ratio of GO to ZrCl4 at 1 : 100 exhibited a breakthrough adsorption capacity of 77.4 mg/g in dynamic adsorption experiments and a saturated capacity of up to 1245.5 mg/g in static tests, outperforming both UiO66 MOF and UiO66 MOG materials. In conclusion, this study elucidates multiple regulatory mechanisms of GO incorporation in modulating pore structure and host-guest interactions, providing a new theoretical basis and practical guidance for designing efficient and recyclable VOC adsorbents.

挥发性有机化合物（VOCs），尤其是甲苯这类芳香烃，凭借其高挥发性与生物毒性，对环境与人类健康构成严重威胁。传统金属有机框架（MOFs）以微孔结构为主，其在吸附容量与分子传输效率间存在的权衡效应，推动了更先进材料体系的开发。本研究开发了基于UiO-66、掺杂氧化石墨烯（GO）的金属有机框架凝胶（MOGs），利用GO的协同改性作用。GO的π共轭结构可增强与甲苯分子间的π-π相互作用，而其丰富的含氧官能团则可促进与金属节点的竞争性配位，进而暴露更多路易斯酸性位点，强化金属-π相互作用。实验结果表明，GO与四氯化锆（ZrCl4）质量比为1:100的UG-1样品，在动态吸附实验中展现出77.4 mg/g的穿透吸附容量，静态测试下饱和吸附容量最高可达1245.5 mg/g，性能优于纯UiO-66 MOF及UiO-66 MOG材料。综上，本研究阐明了GO掺杂调控孔道结构与主客体相互作用的多重机制，为设计高效可循环的VOC吸附剂提供了全新的理论依据与实践指导。