| 초록 |
This study evaluated the recovery of precious metals, particularly palladium (Pd) by polyethylenimine (PEI)-modified biosorbent (PEIB) from hydrochloric acid solutions using a combined process of sorption and incineration. The PEIB was prepared by coating with PEI on the surface of Corynebacterium glutamicum biomass and then crosslinking with glutaraldehyde. Pd(II) sorption experiments by the PEIB exhibited that the sorption equilibrium was reached with 30 min and the maximum uptake was evaluated to be 176.8 mg/g by the Langmuir model. To recover metallic Pd with high purity, the Pd(II)-sorbed PEIB was incinerated. Among several factors, two factors such as incineration temperature and Pd amount were selected as major factors in the incineration process. Both factors significantly affected the recovery efficiency and purity of Pd recovered. Consequently, almost pure metallic Pd was recovered under the conditions of 900 oC and 136.9 mg Pd per g biosorbent. |
