期刊
CHEMOSPHERE
卷 303, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134932
关键词
Metal-organic framework; Single-crystal ZnO; Crystal planes; Photocatalytic degradation; Nanoarchitecture control
资金
- Japan Society for the Promotion of Science (JSPS)
- Paderborn Center for Parallel Computing (PC2)
We found that MOF-5 can transform into distinct zinc oxide nanostructures, and this transformation can be controlled by temperature and structure-directing agent. A synthesis temperature of 180 degrees C resulted in high crystallinity and superior photocatalytic activity in degrading methylene blue.
We show here that MOF-5, a sample Zn-based MOF, can uniquely transform into distinct zinc oxide nano-structures. Inspired by the interconversion synthesis of zeolites, we converted MOF-5 into nanocrystalline ZnO. We found the conversion of MOF-5 into ZnO to be tunable and straightforward simply by controlling the treatment temperature and choosing an appropriate structure-directing agent (SDA). Refined X-ray diffraction (XRD) patterns showed that a synthesis temperature of 180 degrees C (sample ZnO-180) was optimal for achieving high crystallinity. We examined ZnO-180 with high-resolution transmission electron microscopy (HRTEM), which confirmed that the samples were made of individual crystallites grown along the c-axis, or the (001) direction, thus exposing lower energy surfaces and corroborating the XRD pattern and the molecular dynamics calculations. Further investigations revealed that the obtained ZnO at 180 degrees C has a superior photocatalytic activity in degrading methylene blue to other ZnO nanostructures obtained at lower temperatures.
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