研究目的
Investigating the transitional transmittance response of ZIF-8 gas adsorption using terahertz waves to estimate time constants for adsorption and desorption processes and demonstrate its potential for gas analysis.
研究成果
Time constants for gas adsorption and desorption onto ZIF-8 were successfully estimated using terahertz transmittance responses. Differences in desorption time constants between propane and n-butane indicate varying affinities, demonstrating the potential for discriminating gases with MOFs and terahertz technology.
研究不足
The time constants may vary depending on experimental conditions such as temperature and pressure. The study is limited to specific gases (propane and n-butane) and a single MOF (ZIF-8), and the terahertz beam diameter might affect measurements.
1：Experimental Design and Method Selection:
The study used terahertz spectroscopy to measure transmittance changes in ZIF-8 during gas exposure, based on the assumption that vibrations related to gas adsorption can be detected. Exponential curve fitting was applied to estimate time constants.
2：Sample Selection and Data Sources:
ZIF-8 powder was used, deposited on a PTFE membrane filter. Gases included propane, n-butane, and nitrogen.
3：List of Experimental Equipment and Materials:
Terahertz spectrometer (model TSS-I), PTFE membrane filter (T300A013A), gas flow meter, sample tube with polymer film windows, ZIF-8 powder (Basolite Z1200), methanol, propane gas (99.5%), n-butane gas (99.0%), nitrogen gas (99.9995%).
4：5%), n-butane gas (0%), nitrogen gas (9995%).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: ZIF-8 was deposited on the filter, dried under vacuum, placed in a tube, and set in the spectrometer. Alternating exposures to alkane gases and nitrogen were performed for 20 minutes each at a flow rate of 50 mL/min, with transmittance measured at 2.0 THz.
5：0 THz.
Data Analysis Methods:
5. Data Analysis Methods: Time constants for adsorption and desorption were estimated using exponential equations (Eq. 1 and Eq. 2) by fitting the transmittance-time profiles.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
