School of Chemical Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea.
Bioresour Technol. 2012 Jan;104:208-14. doi: 10.1016/j.biortech.2011.11.018. Epub 2011 Nov 15.
This study introduces a new process for the recovery of gold in porous fiber form by the incineration of Au-loaded biosorbent fiber from gold-cyanide solutions. For the recovery of gold from such aqueous solutions, polyethylenimine (PEI)-modified bacterial biosorbent fiber (PBBF) and PEI-modified chitosan fiber (PCSF) were developed and used. The maximum uptakes of Au(I) ions were estimated as 421.1 and 251.7 mg/g at pH 5.5 for PBBF and PCSF, respectively. Au-loaded biosorbents were freeze-dried and then incinerated to oxidize their organic constituents while simultaneously obtaining reduced gold. As a result, porous metallic gold fibers were obtained with 60 μm of diameter. Scanning electron microscopic (SEM) analysis and mercury porosimetry revealed the fibers to have 60 μm of diameter and to be highly porous and hollow. The proposed process therefore offers the potential for the efficient recovery of metallic porous gold fibers using combined biosorption and incineration.
本研究提出了一种从载金生物吸附纤维在氰化金溶液中焚烧来回收多孔纤维形式金的新工艺。为了从这种水溶液中回收金，开发并使用了聚乙烯亚胺（PEI）修饰的细菌生物吸附纤维（PBBF）和 PEI 修饰的壳聚糖纤维（PCSF）。在 pH 5.5 下，PBBF 和 PCSF 对 Au（I）离子的最大吸附量分别估计为 421.1 和 251.7mg/g。载金生物吸附剂经冷冻干燥后再进行焚烧，以氧化其有机成分，同时获得还原金。结果，得到了直径为 60μm 的多孔金属金纤维。扫描电子显微镜（SEM）分析和压汞法表明，纤维的直径为 60μm，且具有高度多孔和中空的特点。因此，该工艺为采用生物吸附和焚烧相结合的方法高效回收金属多孔金纤维提供了可能。
