Electrochemically Assisted Photocatalytic Degradation of 4-Chlorophenol by ZnFe2O4-Modified TiO2 Nanotube Array Electrode under Visible Light Irradiation

被引:176
作者
Hou, Yang [1 ,2 ]
Li, Xinyong [1 ,2 ,3 ]
Zhao, Qidong [1 ,2 ]
Quan, Xie [1 ,2 ]
Chen, Guohua [3 ]
机构
[1] Dalian Univ Technol, Key Lab Ind Ecol & Environm Engn MOE, Sch Environm Sci & Technol, Dalian 116024, Peoples R China
[2] Dalian Univ Technol, State Key Lab Fine Chem, Sch Environm Sci & Technol, Dalian 116024, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China
基金
国家高技术研究发展计划(863计划);
关键词
TITANIUM; OXIDATION; FILMS;
D O I
10.1021/es100004u
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A well-aligned ZnFe2O4/TiO2 composite nanotube array (ZnFe2O4/TiO2-NTs) electrode with visible-light activity was successfully prepared using a two-step electrochemical process of anodization and a novel cathodic electrodeposition method followed by annealing. The ZnFe2O4 nanoparticles were highly dispersed inside the TiO2-NTs but minimized at the tube entrances. The structure and optical properties of the TiO2 nanotubes and the derived composites have been well characterized. The composites displayed a strong photo response in the visible region and low recombination rate of the electron-hole pairs. In addition, the synthesized ZnFe2O4/TiO2 NTs electrode showed much higher photocurrent density in the visible region than pure TiO2 NTs electrode. The dramatically enhanced electrochemically assisted photocatalytic activity of the composite electrode was evaluated in the decomposition of 4-chlorophenol and dichloroacetate under visible light irradiation (420 nm < lambda < 600 nm). The improved photoelectrocatalytic (PEC) 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 in the visible region. The degradation of 4-chlorophenol was monitored by measuring Cl- concentrations and analyzing reaction intermediates by high-performance liquid chromatography-mass spectroscopy (HPLC-MS).
引用
收藏
页码:5098 / 5103
页数:6
相关论文
共 35 条
[1]   A General Method for the Anodic Formation of Crystalline Metal Oxide Nanotube Arrays without the Use of Thermal Annealing [J].
Allam, Nageh K. ;
Shankar, Karthik ;
Grimes, Craig A. .
ADVANCED MATERIALS, 2008, 20 (20) :3942-+
[2]  
ASAHI R, 2001, SCIENCE, V269, P293
[3]   Photosensitization of TiO2 Nanostructures with CdS Quantum Dots: Particulate versus Tubular Support Architectures [J].
Baker, David R. ;
Kamat, Prashant V. .
ADVANCED FUNCTIONAL MATERIALS, 2009, 19 (05) :805-811
[4]   Charge transfer reductive doping of nanostructured TiO2 thin film's as a way to improve their photoelectrocatalytic performance [J].
Berger, Thomas ;
Lana-Villarreal, Teresa ;
Monllor-Satoca, Damian ;
Gomez, Roberto .
ELECTROCHEMISTRY COMMUNICATIONS, 2006, 8 (11) :1713-1718
[5]   Visible-light responsive zinc ferrite doped titania photocatalyst for methyl orange degradation [J].
Cheng, Ping ;
Deng, Changsheng ;
Gu, Mingyuan ;
Shangguan, Wenfeng .
JOURNAL OF MATERIALS SCIENCE, 2007, 42 (22) :9239-9244
[6]   TiO2 nanotubes:: H+ insertion and strong electrochromic effects [J].
Ghicov, A ;
Tsuchiya, H ;
Hahn, R ;
Macak, JM ;
Muñoz, AG ;
Schmuki, P .
ELECTROCHEMISTRY COMMUNICATIONS, 2006, 8 (04) :528-532
[7]   Dramatic visible photocatalytic degradation performances due to synergetic effect of TiO2 with PANI [J].
Hao Zhang ;
Ruilong Zong ;
Jincai Zhao ;
Yongfa Zhu .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2008, 42 (10) :3803-3807
[8]   Photoeletrocatalytic Activity of a Cu2O-Loaded Self-Organized Highly Oriented TiO2 Nanotube Array Electrode for 4-Chlorophenol Degradation [J].
Hou, Yang ;
Li, Xinyong ;
Zou, Xuejun ;
Quan, Xie ;
Chen, Guchua .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2009, 43 (03) :858-863
[9]  
Janda V, 2000, CHEM LISTY, V94, P905
[10]   Mechanistic studies of the photocatalytic oxidation of trichloroethylene with visible-light-driven N-doped TiO2 photocatalysts [J].
Joung, Soon-Kil ;
Amemiya, Takashi ;
Murabayashi, Masayuki ;
Itoh, Kiminori .
CHEMISTRY-A EUROPEAN JOURNAL, 2006, 12 (21) :5526-5534