Biosynthesis of gold nanoparticles by biosorption using Magnetospirillum gryphiswaldense MSR-1
Biosynthesis of gold nanoparticles by biosorption using Magnetospirillum gryphiswaldense MSR-1
复制标题
使用 Magnetospirillum gryphiswaldense MSR-1 通过生物吸附生物合成金纳米颗粒
DOI：
10.1016/j.cej.2011.09.041
复制
发表时间：
2011-11-15
影响因子：
15.1
通讯作者：
Ji, Yulan
中科院分区：
文献类型：
--
作者：
Cai, Fang;Li, Jing;Ji, Yulan
纳米颗粒的生物合成被认为是一种新颖、有效和环保的方法。本文成功利用gryphiswaldense Magnetospirillum MSR-1在水环境中将金离子还原为零价金属，更重要的是，通过生物吸附使其在细胞表面积聚成球形纳米颗粒。采用透射电子显微镜（TEM）对纳米颗粒进行表征。MSR-1制备的纳米金的粒径范围为10 ~ 40 nm。对金纳米粒子的x射线衍射（XRD）和x射线光电子能谱（XPS）分析证实了金属金的形成。测定了生物合成液的pH值和初始金属浓度；这两个重要的参数被分离和筛选，以确定它们在控制粒度中的作用。结果表明，较低的pH值和Au（III）的初始浓度分别是纳米金颗粒尺寸减小的原因。(C) 2011 Elsevier B.V.版权所有
The biosynthesis of nanoparticles is considered to be a novel, effective and eco-friendly procedure. In this paper, Magnetospirillum gryphiswaldense MSR-1 was successfully used to reduce gold ions to a zero-valent metal in a water environment, and more importantly, to accumulate them into spherical nanoparticles on the cell surface through biosorption. Transmission electron microscopy (TEM) was used to examine nanoparticle characteristics. The size range of the nano-gold made by MSR-1 was from 10 to 40 nm. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses of the gold nanoparticles confirmed the formation of metallic gold. The pH value of the biosynthesis solution and the initial metal concentration were examined; both of these important parameters were isolated and screened to determine their role in controlling particle size. The results demonstrated that lower pH values and initial concentrations of Au(III) were individually responsible for reductions in nano-gold particle size. (C) 2011 Elsevier B.V. All rights reserved.