| 초록 |
Lignin is the second most abundant polymer resource in nature, composed of phenolic hydroxyl groups. In recent years, as interest in the virtuous cycle of carbon resources increases, the importance of materializing lignin has emerged. However, lignin utilization is quite limited due to the complexity and low polymer processability. In this study, cationic lignin (P-Lig) was synthesized by grafting polyethyleneimine (PEI) on the surface of lignin (Lig). Then, a bead-shaped adsorbent was prepared in which a large amount of P-Lig was introduced into the three-dimensional structure of alginate (Alg). We confirmed that P-Lig was successfully prepared by grafting PEI through the FTIR, XPS, and zeta potential analysis. The crosslinked chemical bonding of P-Lig molecules and the strong hydrogen bonding formed with alginate significantly improved the stability in aqueous conditions. As a result, the prepared P-Lig/Alg beads showed excellent Cr(VI) removal efficiency of 300 mg/g or more. |
