摘要
以桑葚植物提取液为还原剂和稳定剂,合成了单分散的类球形、多晶银纳米颗粒。采用紫外-可见分光光度计、透射电子显微镜和选区电子衍射,对银纳米颗粒的形貌、成分及微观结构进行了表征。在可控合成的基础上,以2-、3-、4-硝基苯酚(2-、3-、4-NP)为目标污染物,考察了银纳米颗粒的光催化性能。结果表明,在太阳光照射下,银纳米颗粒展现出了高的光催化活性和稳定性(90天)。2-、3-、4-NP降解反应的动力学速率常数关系如下:K4-NP>K2-NP>K3-NP。其中,4-NP降解反应的动力学速率常数最大可达0.33 min^-1,并可由降解体系中银纳米颗粒的添加量来线性调控。
Monodisperse and quasi-spherical silver nanoparticles(Ag NPs) were synthesized using the mulberry extract as reducing agent and capping agent. The composition, morphology and micro-structure of Ag NPs was characterized by the ultraviolet-visible spectrophotometer, transmission electron microscope and selective electron diffraction. On the basis of the controllable synthesis, the photocatalytic activity of Ag NPs for the degradation of 2-、3-、4-nitrophenol as the target contaminants was investigated. The results indicated that as-prepared Ag NPs exhibited excellent photocatalytic activity and a high stability in 90 days under sunlight. The kinetic rate constants(K) of the 2-、3-、4-nitrophenol degradation followed the order: K4-NP>K2-NP>K3-NP. Especially for the 4-nitrophenol degradation, the maximum of the kinetic rate constant could reach up to 0.33 min^-1. Meanwhile, the kinetic rate constant could be linearly adjusted by the amount of Ag NPs in the degradation system.
作者
周明亮
孙丽
尹证
ZHOU Ming-liang;SUN Li;YIN Zheng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Beijing FRP Research and Design Institute Co.,Ltd.,Beijing 102101,China)
出处
《广州化学》
CAS
2019年第5期7-12,共6页
Guangzhou Chemistry
