Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonbuk, Republic of Korea.
J Hazard Mater. 2010 Sep 15;181(1-3):794-800. doi: 10.1016/j.jhazmat.2010.05.083. Epub 2010 May 24.
A new type of biosorbent able to bind anionic metals was developed by cross-linking of waste biomass Escherichia coli with polyallylamine hydrochloride (PAH). The PAH-modified biomass was investigated for the removal and recovery of Pd(II), in the chloro-complex form, from aqueous solution. The performance of the PAH-modified biomass was evaluated in terms of the following parameters: the solution pH, contact time and initial metal concentration. In the pH edge experiments, the uptake of Pd(II) increased with increasing pH. Pd(II) biosorption proceeded rapidly in the first 10 min, with almost complete equilibrium being achieved within 60 min. Moreover, the isotherm data showed that the maximum uptakes of Pd(II) were 265.3mg/g at pH 3 and 212.9 mg/g at pH 2, respectively. After incineration of the Pd-loaded PAH-modified biomass, metallic palladium was recovered in the ash. X-ray photoelectron spectroscopy (XPS) results confirmed that the palladium was recovered in two valency states: zero-valent and divalent palladium (as PdO). Therefore, we concluded that PAH-modified biomass is a useful and cost-effective biosorbent for the recovery of anionic precious metals as chloro-complex solutions containing hydrochloric acid produced from metal refining processes.
通过交联废生物质大肠杆菌与盐酸多聚烯丙胺（PAH），开发出了一种能够结合阴离子金属的新型生物吸附剂。研究了 PAH 修饰的生物质对 Pd(II)（以氯络合物形式）从水溶液中的去除和回收性能。通过以下参数评估了 PAH 修饰生物质的性能：溶液 pH 值、接触时间和初始金属浓度。在 pH 值边缘实验中，随着 pH 值的增加，Pd(II)的吸收增加。Pd(II)的吸附在最初的 10 分钟内迅速进行，在 60 分钟内几乎达到完全平衡。此外，等温线数据表明，在 pH 值为 3 时，Pd(II)的最大吸附量为 265.3mg/g，在 pH 值为 2 时为 212.9mg/g。负载 Pd 的 PAH 修饰生物质经过焚烧后，金属钯在灰分中得到回收。X 射线光电子能谱（XPS）结果证实，钯以两种价态回收：零价和二价钯（如 PdO）。因此，我们得出结论，PAH 修饰的生物质是一种有用且具有成本效益的生物吸附剂，可用于回收阴离子贵金属，作为从金属精炼过程中产生的含盐酸的氯络合物溶液。
