Preparation of ZnFe2O4/TiO2 Nanotube Array Electrode and Photoelectrocatalysis Degradation of Phenol

doi:10.6023/A12090639

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (02): 213-220.DOI: 10.6023/A12090639 Previous Articles Next Articles

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ZnFe₂O₄/TiO₂纳米管阵列电极的制备及光电催化降解苯酚的研究

孙墨杰^a, 胡全^a, 李健^b, 刘春光^a, 沈阳^c

a 东北电力大学化学工程学院应用化学系吉林 132012;
b 精密测试技术及仪器国家重点实验室天津大学天津 300192;
c 国电东北电力有限公司吉林热电厂吉林 132021

投稿日期:2012-09-10 发布日期:2012-12-18
通讯作者: 胡全 E-mail:huquan2009@126.com
基金资助:
项目受精密测试技术及仪器国家重点实验室开放基金资助.

Preparation of ZnFe₂O₄/TiO₂ Nanotube Array Electrode and Photoelectrocatalysis Degradation of Phenol

Sun Mojie^a, Hu Quan^a, Li Jian^b, Liu Chunguang^a, Shen Yang^c

a Chemical Engineering College, Northeast China Institute of Electric Power Engineering, Jilin 132012;
b State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300192;
c Guodian Jilin Power Plant, Jilin 132021

Received:2012-09-10 Published:2012-12-18
Supported by:
Project supported by the State Key Laboratory of Precision Measuring Technology and Instruments Foundation.

A well-aligned ZnFe₂O₄/TiO₂nanotube array electrode with visible-light activity was successfully prepared using a two-step electrochemical process of anodization and a novel cathodic electrodeposition method. Its morphology and chemical composition was characterized by environmental scanning electron microscope, transmission electron microscope and X-ray diffraction. The ZnFe₂O₄ nanoparticles were highly dispersed inside the TiO₂ nanotube but minimized at the tube entrances. The composites displayed a strong photo response in the visible region and low recombination rate of the electron- hole pairs. The synthesized ZnFe₂O₄/TiO₂ nanotube electrode showed much higher photocurrent density in the visible region than pure TiO₂ nanotube electrode. In addition, we discussed the influence on the electrode properties of ZnFe₂O₄/TiO₂ nanotube array from mass concentration sedimentary time, cycle times and sedimentary voltage. The optimal experimental condition was 0.05 mol/L Zn(NO₃)₃+0.1 mol/L Fe(NO₃)₃, 20 min 5 times and 1 V. The photocatalytic activity of the composite electrode was evaluated in the decomposition of phenol under visible light irradiation. It was found that the degradation rate increased with voltages and an increase in the activity by a factor of 1.5～2 relative to pure TiO₂ nanotube was obtained under the optimal conditions. The improved photoelectrocatalytic activity is derived from the synergetic effect between ZnFe₂O₄ and TiO₂, which promoted the migration efficiency of photogenerated carriers at the interface of the composite and enhanced the efficiency of photon harvesting. Under the visible region, the ZnFe₂O₄/TiO₂ nanotube electrode was operated under the same experimental conditions. The results clearly show a good recycle with the degradation rate of 95% even after five repeated experiments. These results demonstrate that the ZnFe₂O₄/TiO₂ nanotube electrode was an ef?cient material in utilizing solar energy for the photodecomposition of pollutants.

Key words: ZnFe₂O₄/TiO₂ nanotube array electrode, photoelectrocatalysis, phenol

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Sun Mojie, Hu Quan, Li Jian, Liu Chunguang, Shen Yang. Preparation of ZnFe₂O₄/TiO₂ Nanotube Array Electrode and Photoelectrocatalysis Degradation of Phenol[J]. Acta Chimica Sinica, 2013, 71(02): 213-220.

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ZnFe₂O₄/TiO₂纳米管阵列电极的制备及光电催化降解苯酚的研究

Preparation of ZnFe₂O₄/TiO₂ Nanotube Array Electrode and Photoelectrocatalysis Degradation of Phenol

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ZnFe2O4/TiO2纳米管阵列电极的制备及光电催化降解苯酚的研究