| 학회 | 한국재료학회 |
| 학술대회 | 2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 | 24권 1호 |
| 발표분야 | B. 나노화학/바이오 분과 |
| 제목 | Heterogeneous Nucleation Driven Hierarchical Growth of Metal-Organic Frameworks for Efficient Removal of Particulate Matter |
| 초록 | With the rapid development of technology, various pollutants, including COx, NOx, NO3–, SiO2, SO2, SO42–, and so on, are generated by the industry, and they formed particulate matters (PMs) in air. These PMs seriously affect human health in circulatory system or respiratory system. In particular, PM2.5 and PM10, PM with sizes under 2.5 µm and 10 µm, easily infiltrate the human body, causing lung cancer and pneumonia. According to World Health Organization (WHO), for safety, the criteria for PM concentration in air is less than 10 µg m–3 for PM2.5 and 20 µg m–3 for PM10. However, in East Asia and developing countries, the concentration of PMs frequently exceeds the standard, thus this issue is treated as an important environmental agenda in each country. Therefore, it is imperative to find the practical solution for PM. Here, we propose heterogeneous nucleation assisted hierarchical growth of metal-organic framework (MOF) for efficient particulate matter (PM) removal. The assembly of 2-dimensional (2-D) Zn based zeolite imidazole framework (ZIF-L) in deionized water over a period time produced hierarchical ZIF-L (H-ZIF-L) on hydrophilic substrates. During the assembly, the secondary nucleation and growth of ZIF-L occurred on the first grown ZIF-L, leading to the formation of flower-like H-ZIF-L on the backbone. H-ZIF-L was easily synthesized on various substrates, including glass, polyurethane 3-D foam, nylon microfibers, and non-woven fabrics. Importantly, H-ZIF-L on polypropylene microfibers based air filters exhibited efficient PM removal property (92.5% ± 0.8% for PM2.5 and 99.5% ± 0.2% for PM10), low pressure drop (10.5 Pa at 25 L min–1), long-term stability, and recyclability. These superior air filtering properties are mainly attributed to the unique structure of H-ZIF-L. This synthetic method of H-ZIF-L can be extended to various scaffolds for diverse applications. |
| 저자 | Won-Tae Koo1, Ji-Soo Jang1, Shaopeng Qiao2, Wontae Hwang3, Gaurav Jha1, Reginald M. Penner2, Il-Doo Kim3 |
| 소속 | 1Korea Advanced Institute of Science and Technology (KAIST), 2Univ. of California, 3Irvine |
| 키워드 | <P>Metal-Organic Framework; Air filter; Membrane; Hierarchical; Particulate matter</P> |
