Abstract: Zr-based metal-organic frameworks (Zr-MOFs) are widely applied in gas storage and separation, drug delivery, chemical sensing and catalysis, due to their good stability in heat, acid and alkali solutions. They have been used in the process of plasma catalysis, recently. In this work, the stability of three typical Zr-based MOFs (UiO-66, UiO-67, UiO-66-NH2) were studied in the atmospheric-pressure dielectric barrier discharge (DBD) plasma. The structure and specific surface area of the samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and N2 sorption analysis (BET). The results show that UiO-66 exhibits the best stability among the three typical Zr-MOFs in the DBD plasma. The framework of UiO-67 is damaged after DBD plasma treatment, and UiO-66-NH2 is destroyed seriously. The specific surface areas of UiO-67 and UiO-66-NH2 after plasma treatment are only 19.0% and 3.1% of those before plasma treatment. These indicate that UiO-67 and UiO-66-NH2 cannot exist stably in the DBD plasma when using CO2 and H2 mixture as working gas. For comparison, the XRD characteristic peaks of UiO-66 before and after plasma treatment are basically consistent, and the specific surface area after plasma treatment is 80.2% of that before plasma treatment. UiO-66 can maintain its framework structure under discharge voltage of 11.4—19.1 kV for 0.5—3 h, suggesting that UiO-66 has good stability in plasma.
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2020, Vol. 34 
