Incorporation of metal organic framework into mesoporous silica nanoparticles with high contents

作者：Zhao, Qian; Hu, Wenli; Li, Shumin; Gu, Zhengying; Zhang, Ye; Yao, Yining; Zhang, Yue; Liu, Chao; Zhao, Liang^*; Yu, Chengzhong^*

来源：Microporous and Mesoporous Materials, 2023, 360: 112707.

DOI：10.1016/j.micromeso.2023.112707

• Mesoporous
• Silica
• Metal-organic framework
• Nanoparticle
• Nanocomposite
• Metal oxide conversion

The integration of mesoporous silica materials (MSMs) and metal organic frameworks (MOFs) has garnered significant attention. To date, various strategies have been developed to synthesize MSM-MOF composites. However, it is challenging to synthesize MSM-MOF with high MOF contents (e.g., metal to silica molar ratio above 0.4) and well maintained mesopores. Here, we report a metal oxide conversion strategy for the synthesis of dendritic mesoporous silica nanoparticles (DMSNs)-MOF nanocomposites with a high MOF content, using zinc based MOFs as examples. By adjusting the amount of zinc salts and the reaction time, DMSN-ZIF-8 can be prepared with a zinc to silicon molar ratio up to 0.4-0.8:1, and the mesopores can be reserved at the zinc to silicon ratio of 0.4. This strategy can be further applied to synthesize DMSN-ZIF-90 nanocomposites. This work has provided a robust strategy for the synthesis of MSM-MOF composites with adjustable compositions and nanostructures.