| 초록 |
The accumulation of heavy metals in the human body causes serious health problems, so proper removal of heavy metals is necessary. The adsorption method is excellent in the selectivity of the metal, low sensitive for concentration of heavy metal, and reusable. In this study, we prepared porous SiCN ceramic capable of physical adsorption through pores and chemical adsorption of heavy metals through nitrogen atoms. The silsesquiazane (SSQZ), which used as SiCN precursor, has branched structure, which is advantageous for high degree of cross-linking. As a result, the SiCN ceramics derived from SSQZ has a large amount of nitrogen atoms and stable structure pore can be formed even after pyrolysis. In addition, micro-/meso-size pores generated after pyrolysis and macro size pores generated through freeze-casting process form a hierarchical pore structure, which enhances selectivity and permeability, which is more advantageous for removal of heavy metals. |
