| 摘要 |
A process for preparing magnetite nanoparticles incorporating one of more transition elements comprising exposing a ferric iron source to a culture of dissimilatory iron-reducing bacteria (DIRB) and/or a sulphate-reducing bacteria (SRB) in the presence of a redox mediator. The preferred ferric iron source is ferrihydrite, the preferred bacterium is G. sulfurreducens, the preferred redox mediator is an electron shuttle such as anthraquinone-2,6-disulfonate (AQDS). The preferred source of the metal dopant is sodium tetrachloropalladate (Na2PdCl4). The resultant metal-doped magnetite nanoparticles may be coated with a biomolecular coating derived from the bacterium. The metal-doped magnetite nanoparticles are useful catalytically, especially in the Heck reaction between iodobenzene and either styrene or ethyl acrylate. For this reaction, the metal-doped magnetite nanoparticles are more effective catylysts than commercially available colloidal palladium catalysts. |
