Dalian University of Technology, China.
Chemosphere. 2011 Jan;82(4):581-6. doi: 10.1016/j.chemosphere.2010.09.068. Epub 2010 Oct 30.
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.
高度有序的 ZnFe₂O₄ 纳米管阵列通过溶胶-凝胶溶液从阳极氧化铝模板成功制备。环境扫描电子显微镜和 X 射线光电子能谱的结果表明，所制备的样品是垂直排列的尖晶石 ZnFe₂O₄ 纳米管阵列，纳米管沿轴向均匀排列，平均直径约为 200nm。与 ZnFe₂O₄ 纳米粒子薄膜相比，ZnFe₂O₄ 纳米管阵列在紫外-可见吸收光谱中的吸收边缘向高能方向移动。合成的 ZnFe₂O₄ 纳米管阵列在可见光照射下对 4-氯苯酚的降解表现出优异的光催化性能。通过液相色谱-质谱技术鉴定的 4-氯苯酚的主要中间降解产物为苯醌、对苯二酚、邻苯二酚和 2-过氧邻二羟基苯。通过解释光催化反应中中间产物的观察结果，推导并讨论了可见光照射下 4-氯苯酚的降解途径。
