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Acta Chimica Sinica >

2012 , Vol. 0 >Issue 04: 405 - 410

DOI: https://doi.org/10.6023/A1107072

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Photoelectrocatalytic Reduction of Cr(VI) over TiO2 Nanotube Arrays under Half-wave Pulsed Direct Current

  • Wang Qing ,
  • Shang Jing ,
  • Song Han
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  • State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871

Received date: 2011-07-07

  Revised date: 2011-09-15

  Online published: 2011-10-09

Supported by

Project was supported by the National Natural Foundation of China (No. 20407002), the National Basic Research Program (973 program, No. 2002CB410802) and the Special Funds for State Key Joint Laboratory of Environmental Simulation and Pollution Control.

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Abstract

In this paper, the photoelectrocatalytic (PEC) reduction of Cr(VI) over anodized TiO2 nanotube arrays under UV-light irradiation using the half-wave pulsed direct current (h-DC) as the applied voltage was reported. This mode of voltage brings about better separation of photogenerated electrons and holes, resulting in much higher photoelectrocatalytic efficiency than either the conventional direct current (DC) or the alternate current (AC). Under the half-wave pulsed direct current, the influence factors such as the value and frequency of the voltage, also concentration of the electrolyte (NaCl), on the PEC reduction of Cr(VI) were investigated. The PEC reduction rate increased with increasing voltage and frequency, but could be restrained by a high frequency. The concentration of NaCl exhibited little effect on the PEC reduction reaction of Cr(VI), for the weak function of active chlorine species and electric conduction in the heavy metal reduction system.

Key words： TiO2 nanotubes; Cr(VI); half-wave pulsed direct current; alternate current; photoelectrocatalytic reduction

Cite this article

Wang Qing , Shang Jing , Song Han . Photoelectrocatalytic Reduction of Cr(VI) over TiO2 Nanotube Arrays under Half-wave Pulsed Direct Current[J]. Acta Chimica Sinica, 2012 , 0(04) : 405 -410 . DOI: 10.6023/A1107072

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