Acta Chimica Sinica ›› 2012, Vol. 0 ›› Issue (04): 405-410.DOI: 10.6023/A1107072 Previous Articles     Next Articles

Full Papers

TiO2 纳米管半波脉冲直流电光电催化还原Cr(VI)

汪青, 尚静, 宋寒   

  1. 北京大学环境科学与工程学院 环境模拟与污染控制国家重点联合实验室 北京 100871
  • 投稿日期:2011-07-07 修回日期:2011-09-15 发布日期:2011-10-09
  • 通讯作者: 尚静
  • 基金资助:

    国家自然科学基金(No. 20407002)、国家重点基础研究发展计划(973 计划) (No. 2002CB410802)及环境模拟与污染控制国家重点联合实验室(北京大学) 专项资助项目.

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

Wang Qing, Shang Jing, Song Han   

  1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871
  • Received:2011-07-07 Revised:2011-09-15 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.

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