Capability of novel ZnFe₂O₄ nanotube arrays for visible-light induced degradation of 4-chlorophenol.
Highly ordered ZnFe₂O₄ nanotube arrays were successfully prepared by anodic aluminum oxide templates from sol-gel solution. The results from environmental scanning electron microscopy and X-ray photoemission spectroscopy indicated that the as-prepared samples were vertically aligned spinel ZnFe₂O₄ nanotube arrays, and the nanotubes were uniform along the axial direction with an average diameter of approximately 200 nm. The absorption edge of ZnFe₂O₄ nanotube arrays shifted to a higher energy in the UV-Vis absorption spectrum compared with that of ZnFe₂O₄ nanoparticles film. The synthesized ZnFe₂O₄ nanotube arrays exhibited excellent photocatalytic capability for degradation of 4-chlorophenol under visible-light irradiation. The main intermediate degradation species of 4-chlorophenol identified by liquid chromatography-mass technique were benzoquinone, hydroquinone, hydroxybenzoquinone and 2-peroxy-o-dihydroxybenzene. The degradation pathways of 4-chlorophenol under visible-light irradiation was derived and discussed by interpreting the observations of the intermediate species in the photocatalytic reactions.
Dalian University of Technology, China. xyli@dlut.edu.cn
Xinyong
X
Li
Yang
Y
Hou
Qidong
Q
Zhao
Wei
W
Teng
Xijun
X
Hu
Guohua
G
Chen
D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods; D005290:Ferric Compounds / Q000737:chemistry*; D017745:Incineration; D008027:Light; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D055668:Photochemical Processes; D013052:Spectrometry, X-Ray Emission; D017967:Zinc Compounds / Q000737:chemistry*
D002733:Chlorophenols; D004785:Environmental Pollutants; D005290:Ferric Compounds; D017967:Zinc Compounds; C029107:4-chlorophenol