| 초록 |
In this work, the ammonia plasma treatment of activated carbons (ACs) is carried out to introduce surface amine- groups onto carbon surfaces and to investigate the relationships between the surface functionality of ACs and the amount of the adsorption of HCHO gas. The ACs are treated with a 13.56 MHz plasma system under 300 W of RF power in NH3/Ar (NH3 0.1 %) atmospheric pressure. Surface properties of the treated ACs are determined by surface acido-basicity, Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM). N2/77K gas adsorption isotherms of the treated ACs are investigated by BET and D-R plot methods to characterize specific surface area, pore volume, and pore size distribution. The efficiency of HCHO removal is confirmed by gas detecting tube methods. As experimental results, the increase of the surface functionality of the ACs plays an important role in increasing adsorption capacity of HCHO, resulting from the development of highly reactive species. |
