Continuous-flow biosynthesis of silver nanoparticles by lixivium of sundried Cinnamomum camphora leaf in tubular microreactors
Continuous-flow biosynthesis of silver nanoparticles by lixivium of sundried Cinnamomum camphora leaf in tubular microreactors
复制标题
管式微反应器中晒干樟叶浸出物连续流生物合成纳米银
DOI：
10.1021/ie701698e
复制
发表时间：
2008-08-20
影响因子：
4.2
通讯作者：
Lin, Wenshuang
中科院分区：
文献类型：
--
作者：
Huang, Jiale;Lin, Liqin;Lin, Wenshuang
研究了在连续流管式微反应器中通过晒干的樟树叶浸出液生物生产银纳米粒子。通过透射电子显微镜 (TEM)、紫外可见光谱、X 射线衍射 (XRD) 和能量色散 X 射线 (EDX) 检查银纳米粒子的性质。通过原子吸收分光光度法（AAS）光谱测量反应后残留银离子的浓度。分析了香樟叶浸出物的傅里叶变换红外（FTIR）光谱并计算了沿管的温度分布，以探索银纳米粒子的形成机制。反应前后香樟叶浸出液的FTIR光谱比较表明，浸出液中的多元醇可能是银离子还原的主要原因。根据温度分布，在90℃的微反应器入口处，流体温度的飙升导致银核通过均匀成核而爆发。随后，核沿着反应器逐渐生长成5至40纳米的银纳米颗粒。在 60 摄氏度下，通过异相成核和奥斯特瓦尔德熟化相结合，形成多分散颗粒。
Biological production of silver nanoparticles by lixivium of sundried Cinnamomum camphora leaf in continuous-flow tubular microreactors was investigated. Properties of silver nanoparticles were examined by transmission electron microscopy (TEM), UV-vis spectroscopy, X-ray diffraction (XRD), and energy dispersive X-ray (EDX). The concentration of residual silver ions after reaction was measured by atomic absorption spectophotometry (AAS) spectroscopy. Fourier transform infrared (FTIR) spectra of C. camphora leaf lixivium were analyzed and temperature profiles along the tubes were calculated to explore formation mechanism of silver nanoparticles. Comparison of FTIR spectra of C. camphora leaf lixivium before and after reaction demonstrated the polyols in the lixivium may be mainly responsible for reduction of silver ions. According to the temperature profiles, at the inlet of the microreactors at 90 degrees C, the soar of the fluid temperature induced the burst of silver nuclei by homogeneous nucleation. Subsequently, the nuclei grew gradually along the reactors into silver nanoparticles from 5 to 40 nm. Polydisperse particles were formed by combination of heterogeneous nucleation and Ostwald ripening along the tubes at 60 degrees C.