光催化
X射线光电子能谱
材料科学
可见光谱
兴奋剂
甲基橙
扫描电子显微镜
纳米颗粒
吸收光谱法
纳米线
光电子学
纳米技术
化学工程
化学
催化作用
光学
有机化学
复合材料
物理
工程类
作者
Andris Šutka,Tanel Käämbre,Rainer Pärna,Inna Juhņeviča,Mihael Maiorov,Urmas Joost,Vambola Kisand
标识
DOI:10.1016/j.solidstatesciences.2016.04.008
摘要
High aspect ratio cobalt doped ZnO nanowires showing strong photocatalytic activity and moderate ferromagnetic behaviour were successfully synthesized using a solvothermal method and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), vibrating sample magnetometry (VSM) and UV–visible absorption spectroscopy. The photocatalytic activities evaluated for visible light driven degradation of an aqueous methylene orange (MO) solution were higher than for Co doped ZnO nanoparticles at the same doping level and synthesized by the same synthesis route. The rate constant for MO visible light photocatalytic degradation was 1.9·10−3 min−1 in case of nanoparticles and 4.2·10−3 min−1 in case of nanowires. We observe strongly enhanced visible light photocatalytic activity for moderate Co doping levels, with an optimum at a composition of Zn0.95Co0.05O. The enhanced photocatalytic activities of Co doped ZnO nanowires were attributed to the combined effects of enhanced visible light absorption at the Co sites in ZnO nanowires, and improved separation efficiency of photogenerated charge carriers at optimal Co doping.
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