Torres E, Mata Y N, Blázquez M L, Muñoz J A, González F, Ballester A
Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, Facultad de Ciencias Químicas, Universidad Complutense Av., Complutense s/n, Madrid 28040, Spain.
Langmuir. 2005 Aug 16;21(17):7951-8. doi: 10.1021/la046852k.
Calcium alginate beads were investigated for their biosorption performance in the removal of gold and silver from aqueous solutions. It was found that uptake capacities were significantly affected by the solution pH, with optimum pH values of 2 and 4 for gold and silver, respectively. Kinetic and isotherm experiments were carried out at the optimum pH. The maximum uptake capacities were 290 mg/g for Au and 52 mg/g for Ag. FTIR analysis indicated that both carboxylic and hydroxylic functional groups in alginate beads are involved in the metal binding and later reduction of gold (+3) and silver (+1) to gold (0) and silver (0). SEM and X-ray diffraction confirmed the formation of gold and silver nanoparticles.
研究了海藻酸钙珠对水溶液中金银的生物吸附性能。结果发现，溶液pH值对吸附容量有显著影响，金和银的最佳pH值分别为2和4。在最佳pH值下进行了动力学和等温线实验。金的最大吸附容量为290 mg/g，银的最大吸附容量为52 mg/g。傅里叶变换红外光谱（FTIR）分析表明，海藻酸钙珠中的羧基和羟基官能团均参与了金属结合，随后将金（+3）和银（+1）还原为金（0）和银（0）。扫描电子显微镜（SEM）和X射线衍射证实了金和银纳米颗粒的形成。
