论文部分内容阅读
报道了在半波脉冲直流电(h-DC)作为电压驱动下,以阳极氧化法制备的TiO2纳米管(TNT)为工作电极,紫外光光电催化(PEC)还原Cr(VI)的研究.半波脉冲直流电相比稳压直流电(DC)和交流电(AC)具有更佳的载流子分离和光电催化作用.探讨了电压大小、频率及电解质NaCl浓度对Cr(VI)催化还原反应的影响.TNT光电催化和电催化还原Cr(VI)效率随外加电压和频率的增大而增大,但是频率过高对反应有一定的抑制作用.电解质NaCl对反应的影响不显著,这是因为在重金属还原体系中,NaCl作为活性氯物种的母体和增强溶液导电性的作用体现得不明显.
Reported the photocatalytic (PEC) reduction of Cr (VI) by using TiO2 nanotube (TNT) prepared by anodic oxidation as working electrode driven by half-wave impulse direct current (h-DC) Pulsed DC has better charge carrier separation and photocatalytic activity than DC and AC.The effects of voltage, frequency and electrolyte NaCl concentration on the catalytic reduction of Cr (VI) are discussed.TNT The photocatalytic and electrocatalytic reduction of Cr (VI) increased with the increase of applied voltage and frequency, but the higher the frequency was, the lower the reaction was. The effect of electrolyte NaCl on the reaction was not significant, In the system, the role of NaCl as the precursor of the active chlorine species and enhancing the conductivity of the solution is not obvious.