| 초록 |
Hexavalent chromium ions are toxic and carcinogenic thus necessarily removed to prevent permanent accumulation in the human body while trivalent chromium ions can act as an essential element in nature. Various methods have been developed to remove Cr(VI) such as adsorption, chemical precipitation methods, ion exchange, and so on. Lignin, the second most abundant natural polymer in the earth has several functional groups capable of adsorbing Cr(Ⅵ) ions. However, adsorbents based on lignin has poor mechanical property as well as insignificant adsorption efficiency. In this study, polyethyleneimine crosslinked lignin beads were prepared by using glutaraldehyde for the sake of enhanced Cr(Ⅵ) removal capacity and ensured mechanical stability. For the characterization, FE-SEM, DLS, XPS and UTM were performed for both lignin beads and PEI-lignin beads. Furthermore, we confirmed Cr(Ⅵ) removal behavior under various conditions. |
