采用水热法通过控制前躯体钨酸钠的加入量和反应时间制备了长方体形纳米WO3,利用X射线粉末衍射(XRD)、透射电镜(TEM)、扫描电镜及能量散射光谱仪(SEM-EDS)对样品进行表征。并运用差示扫描量热法(DSC)研究纳米WO3对六硝基六氮杂异伍兹烷(...采用水热法通过控制前躯体钨酸钠的加入量和反应时间制备了长方体形纳米WO3,利用X射线粉末衍射(XRD)、透射电镜(TEM)、扫描电镜及能量散射光谱仪(SEM-EDS)对样品进行表征。并运用差示扫描量热法(DSC)研究纳米WO3对六硝基六氮杂异伍兹烷(CL-20)热分解特性的影响。结果表明:与单组分CL-20相比,纳米WO3的加入使复合物WO3/CL-20的热分解峰温降低2.95℃,活化能减小7.74 k J·mol-1,因此纳米WO3能够加速CL-20的热分解。展开更多
以钨粉(W)和双氧水(H2O2)为原料,通过液相合成法制备前驱体粉末后,采用刮刀涂布工艺制备了具有高光电化学(PEC)水氧化效率的WO3光阳极。并利用X射线衍射、拉曼光谱分析并结合热分析法研究煅烧温度对纳米WO3的晶型和晶粒直径的影响。结...以钨粉(W)和双氧水(H2O2)为原料,通过液相合成法制备前驱体粉末后,采用刮刀涂布工艺制备了具有高光电化学(PEC)水氧化效率的WO3光阳极。并利用X射线衍射、拉曼光谱分析并结合热分析法研究煅烧温度对纳米WO3的晶型和晶粒直径的影响。结果表明,煅烧温度为400℃时可制备单斜相WO3,且WO3的晶粒直径随温度升高而增大。扫描电镜分析结果表明,制备的WO3颗粒尺寸约为20~70 nm。环伏安测试结果表明,WO3-600光阳极的光电流达到1.88 m A/cm2,是WO3-400的2.65倍。入射光子-电流转换效率(IPCE)说明WO3光阳极的起始波长为470 nm。Co2+的添加大幅提升了PEC分解水的催化活性和稳定性。展开更多
In this work, the highly ordered tungsten trioxide nanotube arrays have been synthesized by the combination of Sol-Gel chemical method and anodic aluminum oxide (AAO) templating method. The morphology and the chemical...In this work, the highly ordered tungsten trioxide nanotube arrays have been synthesized by the combination of Sol-Gel chemical method and anodic aluminum oxide (AAO) templating method. The morphology and the chemical composition of tungsten trioxide nanotubes arrays were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and X-ray diffraction (XRD). The results show that the wall thickness of the tungsten trioxide nanotubes arrays can be controlled by the immersion time. The growth mechanism of naotubes arrays is also discussed.展开更多
Well‐aligned zinc oxide(ZnO)nanotube arrays loaded with tungsten trioxide(WO3)nanoparticles were synthesized by a process involving chemical bath deposition in combination with pyrolysis.The prepared ZnO–WO3composit...Well‐aligned zinc oxide(ZnO)nanotube arrays loaded with tungsten trioxide(WO3)nanoparticles were synthesized by a process involving chemical bath deposition in combination with pyrolysis.The prepared ZnO–WO3composites were characterized by X‐ray diffraction,energy dispersive spectrometer,field emission scanning electron microscopy,X‐ray photoelectron spectroscopy,photoluminescence spectroscopy,Fourier transform infrared spectroscopy and UV–vis diffuse reflectance spectroscopy.The photocatalytic activities of the ZnO–WO3composite photocatalysts with different WO3contents for the degradation of the herbicide chlorinated phenoxyacetic acid(MCPA‐Na)under simulated sunlight irradiation were systematically evaluated.It was found that the WO3content had a great effect on the photocatalytic activity of the ZnO–WO3composites.The composite with3%WO3showed the highest photocatalytic activity,with a degradation rate of chlorinated phenoxyacetic acid of98.5%after200min with20mg of photocatalyst.This photodegradation rate was about twice that of the pristine ZnO nanotube array.The recombination of photogenerated electrons and holes was increasingly suppressed with the addition of WO3to ZnO.The high relative content of defects on the surface of the ZnO–WO3composites was beneficial to their photocatalytic activity in the degradation of chlorinated phenoxyacetic acid.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved.展开更多
文摘采用水热法通过控制前躯体钨酸钠的加入量和反应时间制备了长方体形纳米WO3,利用X射线粉末衍射(XRD)、透射电镜(TEM)、扫描电镜及能量散射光谱仪(SEM-EDS)对样品进行表征。并运用差示扫描量热法(DSC)研究纳米WO3对六硝基六氮杂异伍兹烷(CL-20)热分解特性的影响。结果表明:与单组分CL-20相比,纳米WO3的加入使复合物WO3/CL-20的热分解峰温降低2.95℃,活化能减小7.74 k J·mol-1,因此纳米WO3能够加速CL-20的热分解。
文摘以钨粉(W)和双氧水(H2O2)为原料,通过液相合成法制备前驱体粉末后,采用刮刀涂布工艺制备了具有高光电化学(PEC)水氧化效率的WO3光阳极。并利用X射线衍射、拉曼光谱分析并结合热分析法研究煅烧温度对纳米WO3的晶型和晶粒直径的影响。结果表明,煅烧温度为400℃时可制备单斜相WO3,且WO3的晶粒直径随温度升高而增大。扫描电镜分析结果表明,制备的WO3颗粒尺寸约为20~70 nm。环伏安测试结果表明,WO3-600光阳极的光电流达到1.88 m A/cm2,是WO3-400的2.65倍。入射光子-电流转换效率(IPCE)说明WO3光阳极的起始波长为470 nm。Co2+的添加大幅提升了PEC分解水的催化活性和稳定性。
文摘In this work, the highly ordered tungsten trioxide nanotube arrays have been synthesized by the combination of Sol-Gel chemical method and anodic aluminum oxide (AAO) templating method. The morphology and the chemical composition of tungsten trioxide nanotubes arrays were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and X-ray diffraction (XRD). The results show that the wall thickness of the tungsten trioxide nanotubes arrays can be controlled by the immersion time. The growth mechanism of naotubes arrays is also discussed.
基金supported by the National Natural Science Foundation of China(51574071)~~
文摘Well‐aligned zinc oxide(ZnO)nanotube arrays loaded with tungsten trioxide(WO3)nanoparticles were synthesized by a process involving chemical bath deposition in combination with pyrolysis.The prepared ZnO–WO3composites were characterized by X‐ray diffraction,energy dispersive spectrometer,field emission scanning electron microscopy,X‐ray photoelectron spectroscopy,photoluminescence spectroscopy,Fourier transform infrared spectroscopy and UV–vis diffuse reflectance spectroscopy.The photocatalytic activities of the ZnO–WO3composite photocatalysts with different WO3contents for the degradation of the herbicide chlorinated phenoxyacetic acid(MCPA‐Na)under simulated sunlight irradiation were systematically evaluated.It was found that the WO3content had a great effect on the photocatalytic activity of the ZnO–WO3composites.The composite with3%WO3showed the highest photocatalytic activity,with a degradation rate of chlorinated phenoxyacetic acid of98.5%after200min with20mg of photocatalyst.This photodegradation rate was about twice that of the pristine ZnO nanotube array.The recombination of photogenerated electrons and holes was increasingly suppressed with the addition of WO3to ZnO.The high relative content of defects on the surface of the ZnO–WO3composites was beneficial to their photocatalytic activity in the degradation of chlorinated phenoxyacetic acid.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved.
基金Research Foundation for Talented Scholars of Suqian College(SQCGJ2010002)Practice of College Students in Jiangsu Province Innovative Training Projects(2010SSJ02)
