Lengke Maggy F, Fleet Michael E, Southam Gordon
Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 5B7, Canada.
Langmuir. 2006 Aug 15;22(17):7318-23. doi: 10.1021/la060873s.
Interaction of cyanobacteria (Plectonema boryanum UTEX 485) with aqueous platinum(IV)-chloride (PtCl(4) degrees ) has been investigated at 25-100 degrees C for up to 28 days, and 180 degrees C for 1 day. The addition of PtCl(4) degrees to the cyanobacteria culture initially promoted the precipitation of Pt(II)-organic material as amorphous spherical nanoparticles (< or =0.3 microm) in solutions and dispersed nanoparticles within bacterial cells. The spherical Pt(II)-organic nanoparticles were connected into long beadlike chains by a continuous coating of organic material derived from the cyanobacterial cells, and aged to nanoparticles of crystalline platinum metal with increase in temperature and reaction time. The stepwise reduction for the formation of platinum nanoparticles in the presence of cyanobacteria was deduced to be Pt(IV) [PtCl(4) degrees ] --> Pt(II) [Pt(II)-organics] --> Pt(0). Spherical platinum-bearing nanoparticles were not present in abiotic PtCl(4) degrees experiments conducted under similar conditions and duration.
在25至100摄氏度下长达28天以及在180摄氏度下1天的时间里，研究了蓝细菌（鞘丝藻UTEX 485）与氯化铂（IV）水溶液（PtCl₄⁰）的相互作用。向蓝细菌培养物中添加PtCl₄⁰最初促进了溶液中Pt（II）-有机物质以无定形球形纳米颗粒（≤0.3微米）的形式沉淀，并使纳米颗粒分散在细菌细胞内。球形的Pt（II）-有机纳米颗粒通过源自蓝细菌细胞的有机物质连续涂层连接成长串珠状链，并随着温度和反应时间的增加而老化为结晶铂金属纳米颗粒。推断在蓝细菌存在下形成铂纳米颗粒的逐步还原过程为Pt（IV）[PtCl₄⁰]→Pt（II）[Pt（II）-有机物]→Pt（0）。在类似条件和持续时间下进行的非生物PtCl₄⁰实验中不存在球形含铂纳米颗粒。
